International conference on

Aquaculture & Marine Biology

Rome, Italy   June 25-27, 2018

Program Schedule

Monday, June 25 , 10:20-10:50

Meetings International - Aqua 2018 Conference Keynote Speaker Daniel D. Benetti photo

Keynote Forum

Daniel D. Benetti

University of Miami, USA

Title

Overview on advanced technologies of marine finfish aquaculture in the Americas

Biography

Dr. Daniel Benetti is a Professor and Director of Aquaculture at the University of Miami's Rosenstiel School of Marine and Atmospheric Science. He has over 30 years experience in aquaculture worldwide. He specializes in developing and advancing hatchery, land-based (recirculating Aquaculture Systems and flow-through) and open ocean growout technologies of marine fish, including but not restricted to, cobia, Seriola, mahi, tuna, snapper, grouper, pompanos and flounder. He has published over 130 articles in aquaculture technology and production, has extensive experience with the industry and has been a consultant for the private and government sectors in several counttries in Latin America, U.S., Europe, Asia, Caribbean, Africa, Australia and the Middle East.

Abstract

Advances in hatchery, nursery and growout technologies of high-value marine fish are presented. Some of the important marine fish species whose aquaculture technologies are available in the Americas are cobia (Rachycentron canadum), hamachi/kampachi (Seriola rivoliana, S. lalandi/S. dorsalis), pompanos (Trachinotus carolinus), Pacific red snapper (Lutjanus guttatus), mahi (Coryphaena hippurus), hirame or Japanese flounder (Paralichthys olivaceus), Nassau grouper (Epinephelus striatus), totoaba (Totoaba macdonaldi), red drum (Sciaenops ocellatus)  – among others. Progress towards full cycle farming of bluefin tuna (Thunnus thynnus) and yellowfin tuna (T. albacares) is also being reported, as well as efforts to develop technology to close the cycle of blackfin tuna (T. atlanticus), a new species for aquaculture.

Modern hatcheries using advanced technologies are beginning to produce mass quantities of juveniles for growout primarily in exposed, high-energy area of the open ocean using both submersible cages such as SeaStations and Aquapods and improved models of traditional gravity cages. Recently, progress in Recirculating Aquaculture Systems (RAS) and flow-through methods are allowing the development of land-based commercial nursery and growout operations. The potential has been identified, investments are solid, and the industry is growing and posed to expand exponentially in the next few years. Recent relevant technological advances and the most important challenges faced by researchers and the industry are presented.

Recent developments in hatchery technology of a large number of commercially and ecologically important species are resulting in the availability of high quality fingerlings and juveniles for stocking ponds tanks, RAS and cages. Cobia, snapper, Seriola, grouper, mahi-mahi, bluefin and yellowfin tuna, among others, are now routinely stocked for growout to market. These developments have been recently described by Benetti et al. (2010; 2015).  Closing the life cycle of these species and gaining control over the microbiology of the hatchery systems including water quality, live feeds and the micrtobiome of early development stages of sensitive larvae are enabling the producing of juveniles to stock cages or land based system to be grown to market size along with the potential for restocking the oceans. Evidence is presented to support the statement that aquaculture is not only about producing wholesome seafood for human consumption and providing jobs and other socio-economic benefits. Beyond all that, aquaculture has been playing, and will continue to play, a major role in conservation of the species. Indeed, responsible aquaculture will ensure the future of tuna fishery stocks conservation as well as those of other commercially and ecologically important species.

Monday, June 25 , 11:10-11:40

Meetings International - Aqua 2018 Conference Keynote Speaker Osman Samsun photo

Keynote Forum

Osman Samsun

Sinop University, Turkey

Title

Fishing management and sustainable fishing methods In Turkey And Europe

Biography

Osman Samsun is Professor at Faculty of Fisheries and Aquatic Science, Sinop University. He is working as Head of Department of Fishing Gear and Process Technology. He obtained his Ph. D. degree in 1990 from Graduate School of Natural Sciences, Ondokuz May University. His research interest includes conservation biology, fisheries science, population dynamics and fisheries sustainability.

Abstract

The growing human population in the world needs animal protein is important. Aquaculture is a very important resource for meeting this need. However, it is imperative that seafood resources be operated sustainably. Many countries are aware of this fact and take various measures.

The fishery management, which is changing according to the countries, should be basically based on scientific principles and researches. In practice, the priority needs of countries and their socio-political preferences sometimes adversely affect sustainable fisheries management

The importance, as well as the necessity, of fisheries management has been widely acknowledged and well documented over the past decades. The obligation to ensure sustainable exploitation of renewable fisheries resources has been recognized by many coastal states and considerable effects made.

In the last decade some ımportant symptoms, like conflicts between interested users, decreasing CPUE of target species, increasing fishing effort, decreasing mean catch size of target species etc., have been noticed in Turkish marine capture fisheries which call for a reappraisal of fisheries management. Fishery in Turkey are characterized as multispecies, multi gears and targeted both demersal and pelagic fish stocks as in most of other Mediterranean countries. Turkey, especially anchovy, horse mackerel, bonito used for catching fish such as purse seiners fishing capacity has reached quite large. Length of these boats, motor power, and very sophisticated fish finding equipment, etc., is more advanced than all the other countries in the Black Sea. Large- scale fishery is characterized by trawls and purse seines which produce about 90 percent of the total catch.

The sciences on fisheries, especially fisheries economics and management have been well developed in countries like Norway, Iceland, Canada, UK, Japan, Spain where marine culture is also rich, thus fisheries have long been preserved as a tradition. The objectives of fisheries management policy in Turkey and Europa are set by State Planning Organization (SPO). Managing fishery resources in a sustainable way is the main objective of the fisheries policy. Therefore region-based preliminary fisheries plans have been designed. The objectives set out in these plans include rebuilding of depleted stocks, long-term resource management, introduction of fishing rights and sustainability of fishing opportunities for fishermen.

Principal impediments to more effective fishing management are as follow:

Lack of historical and actual data, lack of economic and biologic monitoring of fisheries, lack of coordination amongst stakeholders, lack of legislation for establishing right based fisheries management, lack of legislation for establishing fisheries co-management and stakeholder participation into management process at the local level, difficulties of adoption of ecosystem based fisheries management.

This presentation describes the current situation and what to do about the future comes to sustainable fishing in European countries and Turkey. It is desired that the subject be discussed in the scientific world and awareness creation.

Monday, June 25 , 11:40-12:10

Meetings International - Aqua 2018 Conference Keynote Speaker Nyan Taw photo

Keynote Forum

Nyan Taw

International Aquaculture Consultant, Malaysia

Title

Various intensive shrimp farming systems in Asia: Commercial implementation of biofloc and RAS production systems help control shrimp farming diseases

Biography

Dr Nyan received his Ph.D.in Marine Biology from the University of Tasmania, Australia under Colombo Plan Fellowship. On his return he rejoined as assistant lecture at Rangoon Arts and Science University. Later he joined Fisheries Corporation to head the R&D department. In 1983, he became Project Manager for ADB Inland Fisheries Development Project and technical counter-part for JICA projects in Myanmar. In 1988, he joined the FAO of the UN and served in aquaculture projects in Indonesia, Vietnam and the Philippines culminating the position of Chief Technical Advisor. Dr Nyan had supervised 13 Master’s theses for Zoology Department, Rangoon University and also published a book entitled ‘Prawn Culture in Burma’ in 1984. He has published and presented over 80 papers and co-authored a chapter in the book by Yoram Avnimelech on Biofloc Technology: A Practical Guidebook (2012 & 2014). 

Abstract

Before the mid-1990s, the major diseases affecting the farmed shrimp industry were of bacterial origin. But in Asia and from late 1994, the appearance of various, major viral diseases ­– like White Spot Syndrome Virus (WSSV), Yellow Head Virus (YHV), Infectious Myonecrosis Virus (IMNV) and others – led to changes in the design and operation of some shrimp farms to help prevent outbreaks and dissemination of viral diseases.

More recently, WSSV outbreaks in Saudi Arabia in farming operations for Indian white shrimp (Penaeus indicus) provided more evidence that additional biosecurity was needed. And since 2009, outbreaks of a new bacterial disease, Acute Hepatopancreatic Necrosis Syndrome (AHPNS) – which started in China and spread to Vietnam, Malaysia and Thailand, and later to Mexico in 2013 and Central America in 2015 – has caused losses of billions of dollars. In Australia WSSV outbreak in early 2017 at black tiger shrimp (Penaeus monodon) farms provide additional evidence for the need to change shrimp production systems.

Because of old and newly emerging viral and bacterial diseases affecting their farmed shrimp industry, some years ago various Asian countries started developing and using biofloc and recirculation aquaculture system (RAS) production technologies and/or treating incoming water for culture operations and wastewater treatment as biosecurity measures for disease prevention and control. Many production systems are used by Asian shrimp growers – from single-pond base management to larger RAS systems – but many have yet to reduce their environmental impact due to their wastewater discharges.

Here I discuss examples of different biofloc and recirculation aquaculture (RAS) shrimp farming systems used in Asia in the last two decades, including some of the projects I have personally been involved with and provided technical expertise, as well as some perspectives on these technologies.  Large integrated shrimp farms in Indonesia: PT Dipasena Citra Darmaja in Lampung, PT Central Pertiwi Bahari in Lampung, South Sumatra and PT Sekar Abadi Jaya in West Sumbawa and in Malaysia: Blue Archipelago Bhd projects - Arca Biru Sdn in Kedah and the iSHARP project in Terengganu.

In any aquaculture business, sustainability of a system can improve profits. With emerging disease problems, treating wastewater discharged from farming facility or RAS is of utmost important. What investors, shrimp farmers and technicians need to be aware of is that, whatever waste is discharged into the environment, it will likely com/e back to you in the form of disease sooner or later.

Monday, June 25 , 12:10-12:40

Meetings International - Aqua 2018 Conference Keynote Speaker Vega Cendejas Maria Eugenia photo

Keynote Forum

Vega Cendejas Maria Eugenia

National Polytechnic Institute, Mexico

Title

Toward an acknowledgement of the demersal fish assemblages and its diversity in Yucatan Shelf and Channel

Biography

Maria Eugenia Vega-Cendejas is a biologist graduated from the Faculty of Sciences, UNAM. She obtained a Master's degree in Sciences (Biology) in 1983, being distinguished by the Gabino Barreda Silver Medal at the end of her studies. In March of 1998 she has received the degree of Doctor in Sciences (Biology) in the same Faculty. Currently, her research has focused on the demersal communities of the Yucatan Platform and Canal, as well as the deepwater zone of the Gulf of Mexico. She has graduated six students at doctoral level, 17 of Master and 14 of bachelor degree. She has coordinated 26 Research Projects on structure and function (trophic weft) of the fish community in various coastal ecosystems and protected areas of the Yucatan Peninsula. She has also participated in service projects with the objective of evaluate the environmental quality and health status of the Gulf of Mexico. She has presented papers in 107 national and international congresses, has 37 publications in indexed journals, thirteen chapters of books, fiven memoirs in congresses and four books that contribute to the knowledge of the ichthyofauna in the region. She is a member of the National System of Investigators (level II), member of the Mexican Academy of Sciences and is part of the evaluation committee of several specialized journals and member evaluator of CONACYT.

Abstract

During two oceanographic campaigns (November 2015; August 2016) with 18 sampling stations (shrimp trawl net), it was determined the spatial variation and with respect to depth gradient of the demersal fish community in the Yucatan Platform and Channel. Spatially, three group of stations were stablished in base of latitude and two considering depth (<100, 101-200 m). The ecological parameters, dominant species, spatial and causal associations of the species with the environmental variables (temperature, salinity, depth, organic carbon) were estimated. A total of 161 species were recorded (27 orders and 52 families), with Syacium papillosum as dominant due to its high biomass (10.3%), relative density (11.7%) and occurrence. It was followed in representativeness by Haemulon aurolineatum, Eucinostomus gula and Upeneus parvus. By means of multivariate analysis, no inter-annual change in the fish assemblages was detected, however among group of stations and by depth gradient, significant differences were found. Canonical Correspondence Analysis showed that depth gradient was the principal factor through which community structure changes. Results obtained contribute to the knowledge of this great ecosystem’s biodiversity and reflect that is in good health, considering species richness and abundance.

  • Aquatic Science | Aquaponics | Aquatic Health and Hygiene | Aquaculture Nutrition & Supplies

Monday, June 25, 12:40-13:00

Meetings International - Aqua 2018 Conference Session Speaker Gianluca Ragusa photo

Session Introduction

Gianluca Ragusa

International Consultant , Italy

Title

TBA

Biography

Gianluca Ragusa is an International Independent consultant - Fisheries and aquaculture specialist. He has 27 years’ post-graduate experience in marine and inland aquatic resources sustainable and equitable development and management, in Africa, Caribbean, Europe, Mediterranean, and South East Asia. Conducted several post-graduate training courses in aquatic resources sustainable management and fisheries.

Abstract

TBA

Monday, June 25, 14:00-14:20

Meetings International - Aqua 2018 Conference Session Speaker Marina Paolucci photo

Marina Paolucci

University of Sannio, Italy

Title

Marine biopolymer applications in aquaculture

Biography

Marina Paolucci has completed her PhD at the age of 28 years at the Federico II University of Naples, Italy. She spent her postdoc position at the Boston University, Massachusetts, USA, focusing on aquatic animal reproduction. Today, she is full Professor at the University of Sannio, Italy. She has published more than 90 papers in reputed  journals and has been serving as reviewer and an editorial board member of reputed  journals. Her scientific research is mainly devoted to the application of new materials, molecules  and processes in the field of aquatic species farming and management.

Abstract

Marine organisms synthesize a considerable variety of biopolymers, which can be grouped into three main classes: polysaccharides, proteins and nucleic acids. The exploitation of marine biopolymers for industrial and medical purposes is a fast-growing sector of enormous interest, as demonstrated by the increasing number of different types of compounds isolated from aquatic organisms and transformed into profitable products for health applications and food/feed industry. Differently from feed for livestock, feed for aquaculture requires an adequate level of processing to guarantee good stability in water, long enough for animals to consume it. Indeed, some species are grazers and need time to eat the feed offered. Thus, in order to facilitate rearing management, the addition of binders to the feed to meet the different feeding behavior of different species has to be been considered. Binders are essential for the manufacturing of formulated feed, and research is always on the look-out for new solutions based on eco-friendly, sustainable and cost-effective materials. Here we present some applications of natural biopolymers, mainly carbohydrates capable of creating three-dimensional networks or hydrogels that entrap nutrients and are sustainable and biodegradable.

Monday, June 25, 14:20-14:40

David Guangyi Wang

Tianjin University, China

Title

Dynamic and Community Structure of Fungal-like Protists in the Coastal Ocean Ecosystems

Biography

Dr. Wang has received his PhD in Microbiology from the University of California at Davis and Postdoctoral Studies from College of Chemistry, the University of California at Berkeley. He is the Director of the Center for Marine Environmental Ecology at Tianjin University. He has published more than 65 papers in reputed journals.

Abstract

The coastal ocean connects terrestrial (e.g., rivers and estuaries) with oceanic ecosystems and is considered as a major component of global carbon cycles and budgets. The coastal waters are featured with a high biodiversity and high primary production. Because of the excessive primary production, a large fraction of primary organic matter becomes available to consumers as detritus in the coastal waters. Bacterioplankton have long been known to play a key role in the degradation of this detritus, and export and storage of organic matter in the coastal ecosystems. However, the primary and secondary production and the carbon biogeochemical processes in the ecosystems are largely regulated by nutrient inputs from riverine and other anthropogenic activities through heterotrophic microbial communities.

Thraustochytrids, commonly known as fungal-like protists, are unicellular heterotrophic protists and are recently acknowledged to play a significant role in ocean carbon cycling. Their abundance exceeds that of bacterioplankton in the most time of the year in the coastal waters of China. Also, their abundance and diversity are largely regulated by nutrients inputs from riverine and other anthropogenic activities. Our findings support that thraustochytrids are a dominant heterotrophic microbial group in the coastal waters. Evidently, thraustochytrids are an import, but neglected, component in microbial carbon biogeochemical 

Monday, June 25, 14:40-15:00

Rodrigo Ozorio

University of Porto, Portugal

Title

Effects of Ulva rigida as microalgae diet replacement on broodstock conditioning, gonadal maturation and spawning success of the pacific oysters (Crassostrea gigas)

Biography

Rodrigo Ozorio (RO) is a researcher at Centre of Marine and Environmental Research (CIIMAR), Portugal. RO has more than 20 years of experience in aquaculture research, special emphasis on the fish nutrition. He holds MSc and PhD degrees from Wageningen University and Research Centre (WUR), The Netherlands. RO has expertise on nutritional dynamics of fish and the economic potential of new aquaculture species based on a set of husbandry and physiological criteria. He participated in over 15 national and international projects (overall budget of 2.0 million euros), including four projects as scientific leader dealing with new aquaculture systems and sustainable alternative for intensive marine aquaculture. He supervised 8 PhD theses and 15 MSc theses and he authored over 56 scientific publications

Abstract

The current study evaluated the microalgae replacement by dry seaweed (Ulva rigida) in the reproductive success and biochemical composition of pacific oyster (Crassostrea gigas) during broodstock conditioning. Seven hundred and twenty oysters were divided in four dietary groups (3 tanks/diet; 60 oysters/tank). Each group were fed for 11 weeks with one of the following diets: 100% live microalgae blend (Alg); 75% Alg + 25% seaweed (SW); 50% Alg + 50% SW or 100% SW.  The Alg was composed by 33% Isochrysis galbana clone T.ISO and 66% diatoms (75% Skeletonema costatum + 25% Chaetoceros calcitrans). Gonadal maturation was reflected in the physiological condition of the individuals. All treatments, except 100% SW, showed an increase in condition index and were fully matured at the end of the trial, with the best physiological condition observed in two groups: 75% Alg + 25% SW and 100% Alg. Conversely, oysters fed 100% SW showed a decrease in the reproductive condition and a delay in gonadal development. The results of the respirometry showed an inhibition of oxygen consumption in oysters fed 100% SW, which is in line with the condition index and gonadal maturation. Protein and total lipids content increased during the conditioning, whereas glycogen decreased. Oysters fed 75% Alg + 25% SW had higher protein and total lipids content and lower glycogen content (main energy reserve of gametogenesis) than the other treatments. In addition, this group showed the highest percentage of viable (free-living) veliger larvae after induction of spawning, even higher than the 100% Alg group. The current study demonstrated that it is possible to replace 25% of microalgae with U. rigida in the broodstock conditioning of the pacific oysters, minimizing the operative cost in bivalve hatcheries.

Monday, June 25, 15:00-15:20

Mustapha Hasnaoui

University of Sultan Moulay Slimane, Morocco

Title

Development of Aquaculture in Moroccan dam lakes for climate change adaptation

Biography

Full professor at the Faculty of Sciences and Techniques, University of Sultan Moulay Slimane, Beni-Mellal, Morocco. He is a Director of research and Head of the Environmental Engineering team, He is also Editor-in-chief of the Journal of Water and Environmental Sciences and an Environmental and aquaculture expert. 

 

Abstract

Integrated multi-trophic aquaculture or ecologically intensive aquaculture is an appropriate way to improve fish productivity and strengthen ecosystem services.

According to the FAO (2016), inland aquaculture production accounts for 64% of total aquaculture production, thus exceeding marine production by 14%.

Cage aquaculture is currently one of the fastest growing segments of aquaculture production in the world and forecasts indicate that its potential for development is considerable.

Thus, the development of combined aquaculture systems may constitute a relevant ecological intensification pathway at the level of Moroccan dam reservoirs. FAO (2013) proposed the adoption of an Ecosystemic Approach in Aquaculture. It involves combining a semi-intensive or intensive cage culture with an extensive traditional polyculture management based on the restocking operations carried out by Water and Forests administration.

In order to properly manage the potential of dam reservoirs for the development of rural aquaculture, a fish management system (SAP) has been developed to accurately estimate the optimum production to be developed, the number and size of location of the concessions to be allocated, species and storage densities to be fixed, rules and technical conditions to be respected. The SAP will also propose the appropriate management methods for a better valuation of products and better involvement of local populations (Hasnaoui & Droussi, 2017).

The fish management system was structured around four axes:

• Development of extensive aquaculture to ensure a profitable artisanal fishery through the optimization of fish productivity of dam reservoirs.

• Development of small-scale cage aquaculture adapted to the context and conditions of each environment.

• Establishment of a mechanism for managing aquaculture resources that benefits local populations.

• Promotion of organic aquaculture for a better valorization of fish products.

 

Monday, June 25, 15:20-15:40

Samy El-Zaeem

Alexandria University, Egypt

Title

Phenotype variation and phyolgeny of different population of striped red mullet (Mullus surmuletus, Linnaeus 1758)

Biography

Samy Yehya El-Zaeem is a Professor of Fish Breeding and Production. He is the Head of Animal and Fish Production Department,  Faculty of Agriculture (Saba-Bacha), Alexandria University, Alexandria, Egypt 

Abstract

Variation in phenotype based on morphometric and landmark based on morphometric character indices and meristic counts of different population of striped red mullet (Mullus surmuletus), from different environments; Alexandria, Red sea, Senegal and China were analyzed phylogenetically to study and compare the amount of differences in phenotypes. The results revealed that there were significant differences (P≤0.05) in most of morphometric and landmark based on morphometric character indices, while insignificant differences were detected meristic counts among different population tested. The hierarchical cluster analysis based on quantitative phenotype (morphometric landmark-morphometric and meristic character indices), grouped the four population into three major category groups; the first: Alexandria and Senegal group; the second; Alexandria, Senegal and Red sea population; and the third:  China population group. A dendrogram also showed that Alexandria and Senegal group appears to be more phenotypically similar compared to Red sea population. Moreover, China population group appears to be more phenotypically different compared to the others. Therefore, it was observed in this study that the phenotype analysis based on a large number of morphometric and Landmark based on morphometric character indices and meristic counts, can be used to discriminate fish strains up to the intraspecific level.

 

Monday, June 25, 15:40-16:00

Fatima-Zahra Majdoubi

University of Sultan Moulay Slimane, Morocco

Title

The evaluation of the fecundity changes during the breeding season of silver carp’s females, hypophthalmichthys molitrix

Biography

Fatima-Zahra MAJDOUBI has completed her studies on food processing engineering at the age of 24 years from Agronomic and Veterinary Institute Hassan II. She is actually a PhD student on biology at the faculty of sciences and ‎techniques ‎, University of Sultan Moulay Slimane, Morocco.

Abstract

The present study focuses, on one hand, on evaluating ‎the changes of females’ ‎relative fecundity through the breeding ‎season. On the other ‎hand, it investigates the ‎relationship between the ‎spawning periods and the females’ relative fecundity, weight ‎and age.‎

The induced breeding operations were performed during two ‎consecutive breeding ‎seasons (2016 and 2017). The ‎Broodfish, used in this study, originated from the Deroua ‎‎Fisheries Station, Morocco. ‎fish breeders were reared in earthen ponds ‎‎and feed on ‎phytoplankton ‎‎(Diatomophyceae and ‎Chlorococcales) ‎‎(Farid ‎et al, 2014) available naturally in ‎those ‎ponds. During the two seasons, 44 and 36 females were ‎manipulated respectively. The mean of ova production of these two sets of males, was ‎‎respectively 135.78 g ± 5,64 g (ova /kg of female body weight) and ‎‎142.80 g ± 10.69 g (ova /kg of female body weight‎) ‎

The results revealed that there is no period effect on ‎‎fecundity through the breeding season. However, the ‎‎correlation test showed that the females’ relative fecundity ‎‎correlated positively with the spawning periods. For the two ‎‎successive seasons, the correlation (r²) was 0.18 and only 0.085, ‎‎respectively. Furthermore, Females ‘fecundity was negatively ‎related to their age (-0.283 and -0.108, ‎respectively). ‎

Contrariwise and through the two breeding ‎seasons, the ‎‎females’ weight and oocytes weight were significantly ‎positively correlated. At the first season, the correlation was ‎‎0.668, while at the second season the correlation has recorded ‎‎0.536.

Monday, June 25, 16:20-16:40

Anouar Ouizgane

University of Sultan Moulay Slimane, Morocco

Title

Fish growth of warm water fish species in closed aquatic systems: Earthen ponds of Deroua Fisheries Station (Fkih Ben Salah, Morocco)

Biography

Abstract

The growth of fish in the rearing ponds is affected by the food availability, abiotic factors, stocking density of each species and the interactions between the different species reared in the pond namely predation and competition for food and space.

In order to monitor the growth of the warm water fish (largemouth bass, Nil Tilapia, Silver Carp, Common carp and grass carp) reared in a polyculture system, a study was carried out in the Deroua Fisheries station (Fkih Ben Salah, Morocco) from June to December 2013 in nineteen 2000 m² earthen ponds.

The results showed that the daily growth rates of different species: largemouth bass, Nil Tilapia, Silver Carp, grass Carp and Common carp are ranging from 0.24 to 4.97 g/day ; 1.16 to 4.62 g/day ; 2.48 to  23.08 g/day ; 3.05 to 23.8 g/day  and 7.71 to 30.38 g/day respectively. These rates are highly dependent on stocking density, food availability, water chemical and physical factors quality especially temperature, water transparency and the availability of phytoplankton and marcophytes.

Monday, June 25, 16:40- 17:00

Akintade Adeboyejo

Federal University of Technology, Nigeria

Title

Acute Toxicity and Hematological Responses of 2-2-Dichlorovinyl Dimethyl Phosphate (Dichlorvos) On Fingerlings of Clarias gariepinus

Biography

Dr. Adeboyejo, Akintade completed his Ph.D. at the age of 45years old from the Federal University of Technology, Akure, Ondo state, Nigeria and has been a lecturer in Lagos State University, Lagos, Nigeria since 1998. He is currently a senior lecturer and specializes in Fish Biology & Ecotoxicology. He has published more than 28 papers in reputed journals and has been serving as course coordinator of entrepreneurial studies within the University. He is member of Fisheries societies home and abroad.

 

Abstract

The study investigated lethal toxicity effects of Dichlorvos on Clarias gariepinus fingerlings (Mean weight 8.02±2.56g and length 10.15±1.02cm) in a static renewable bioassay during 96hours exposure period. Treatment were in triplicates with concentrations 0.0, 1.0, 2.0, 3.0, 4.0 and 5.0µg/l. Data on fish mortality and physico-chemical water parameters (Dissolved oxygen, Carbondioxide, pH and Temperature) were taken and subsequently subjected to one way analysis of variance (ANOVA) at P<0.05. Duncan Multiple Range Test (DMART) was used to separate differences between means. The mean lethal concentration (LC50) was determined by Probit analysis.  The water quality parameters of the control showed mean Temp. 29.0±0.10C; pH 7.27±0.3; CO2 0.41±0.1mg/L; and DO 5.83±0.4mg/L. However, the treatment showed significant variations from the control (at P<0.05) except for temperature. Behavioural responses of the fish included frequent surfacing, erratic swimming, mucus secretion, bleeding, skin bleaching, colouration of the abdomen and shivering. 96- Hours LC50 value was 1.51µg/L. The derived hematological indices of White Blood Cell, Lymphocytes, Red Blood Cell, Hemoglobin (HB), Packed Cell Volume, Neutrophil, Mean Corpuscular Hemoglobin Concentration etc; varied significantly from the control at P<0.05. The changes observed indicated that hematological parameters can be used as bio- indicators to illicit stress responses in fish after exposure to different concentrations of DDVP. 

Monday, June 25, 17:00- 17:20

Edwin Clarke

Lagos State University, Nigeria

Title

Organochlorine pesticides in Lithorina lithorea, Mercinaria mercinaria, Callinectes pallidus and Penaeus monodon from Cross River Estuary, Imo River Estuary, Qua Iboe River Estuary, Lagos Lagoon and Badagry Creek

Biography

Organochlorine pesticides (OCPs) has been known to be persistent in the environment and bio-accumulates in aquatic organisms. The OCP levels were measured in water, sediment and shell fishes (Panaeus monodon, Callinectes pallidus, Mercinaria mercinaria and Lithorina lithorea) from three (3) state: Lagos State (Lagos lagoon and Badagry creek), Cross River State (Cross river estuary), Akwa Ibom State (Imo river estuary) and (Qua iboe river estuary), between November 2015 to June 2016, using Gas chromatography with electron capture detector. The highest mean concentration of OCPs were recorded in Lagos lagoon and Badagry creek. The levels in sediment ranged from 0.150 ± 0.012 µg/kg (Alpha HCH) in Lagos lagoon to 243.500 ± 138.000 µg/kg (ppDDT) in Badagry creek. The Concentration in shell fishes ranged from 0.250 ± 0.009 µg/kg (Alpha HCH) in Lagos lagoon to 67.380 ± 22.860 µg/kg (Endosulfan II) in Badagry creek for Callinectes pallidus and from 1.310 ± 0.210 µg/kg (alpha HCH) to 143.500 ± 71.892 µg/kg (Eldrin Aldehyde) in Badagry creek for Penacus monodon. Aldrin was detected in all the samples from the five water bodies. The results showed that OCP levels in all shellfish samples analysed were above the maximum acceptable limits of 0.01ppm (10 µg/kg) set by EU and Federal Ministry of Environment for aquatic life protection.

Abstract

Organochlorine pesticides (OCPs) has been known to be persistent in the environment and bio-accumulates in aquatic organisms. The OCP levels were measured in water, sediment and shell fishes (Panaeus monodon, Callinectes pallidus, Mercinaria mercinaria and Lithorina lithorea) from three (3) state: Lagos State (Lagos lagoon and Badagry creek), Cross River State (Cross river estuary), Akwa Ibom State (Imo river estuary) and (Qua iboe river estuary), between November 2015 to June 2016, using Gas chromatography with electron capture detector. The highest mean concentration of OCPs were recorded in Lagos lagoon and Badagry creek. The levels in sediment ranged from 0.150 ± 0.012 µg/kg (Alpha HCH) in Lagos lagoon to 243.500 ± 138.000 µg/kg (ppDDT) in Badagry creek. The Concentration in shell fishes ranged from 0.250 ± 0.009 µg/kg (Alpha HCH) in Lagos lagoon to 67.380 ± 22.860 µg/kg (Endosulfan II) in Badagry creek for Callinectes pallidus and from 1.310 ± 0.210 µg/kg (alpha HCH) to 143.500 ± 71.892 µg/kg (Eldrin Aldehyde) in Badagry creek for Penacus monodon. Aldrin was detected in all the samples from the five water bodies. The results showed that OCP levels in all shellfish samples analysed were above the maximum acceptable limits of 0.01ppm (10 µg/kg) set by EU and Federal Ministry of Environment for aquatic life protection.