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Title: Induce Spawning and larval development of Tripneustus gratilla, Red Sea, Egypt

Biography:

Esraa E. AbouElMaaty, National Institute of Oceanography and Fisheries, Suez, Egypt

 

 

Abstract

Increasing fishing potential on edible sea urchins causes significant depletion in sea urchins’ populations worldwide. This evinced that aquaculture is required to fill the gap between supply and demand. Induce spawning and larval rearing of the sea urchin T. gratilla was studied. Four induction agents were tested on 4 groups of 10 individuals each of T. gratilla with same sizes. The treatments included: injection with 0.5 and 1.0 M KCL, drying under direct light for 4 hours, and mechanical shaking. The fecundity (oocytes released per female) and responding times to induction agents varied significantly according to the treatment. The highest fecundity was estimated for the group treated with drying under direct light, while the lowest fecundity was recorded for the group treated with mechanical shacking, being 18.6±1.1 and 0.94 ±0.0039 million oocytes/female respectively. In addition, the quickest respond (less than a minute) was recorded for the group treated with 1M KCL, compared with 2-5 minutes for groups treated with other induction agents. It was also noticed that the lower abundance the higher survival, i.e. higher survival of larvae was recorded at a density of 3 larvae/ml compared with the other tested densities of 9 and 6 larvae/ml, all fed with the alga Nanochloropsis species. Embryonic development, larval metamorphoses, and morphometric parameters were followed and measured.