Induced Spawning and Stocking Density of Tripneustus gratilla for aquaculture Proposes in the Red Sea, Egypt | ||||
| Egyptian Journal of Aquatic Biology and Fisheries | ||||
| Article 23, Volume 27, Issue 3, May and June 2023, Page 381-397 PDF (467 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejabf.2023.302060 | ||||
 View on SCiNiTO | ||||
| Author | ||||
| Esraa E. AbouElMaaty et al. | ||||
| Abstract | ||||
| Increasing fishing potential for edible sea urchins causes significant depletion in wild populations worldwide. Thus, induced spawning and larval rearing of Tripneustus gratilla were studied. Four induction agents were tested including injection with 0.5 and 1.0 M KCL, drying under direct light for 4 hours and mechanical shaking. The fecundity 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 ± 0.004 million oocytes/female, respectively. The quickest response was recorded for the group treated with 1M KCL, compared with other induction agents. It was noticed that the lower the abundance, the higher the survival rate, i.e. higher survival of larvae was recorded at a density of 3 larvae/ml. Embryonic development, larval metamorphoses and morphometric parameters were followed and measured. | ||||
| Keywords | ||||
| Aquaculture; Embryonic development; Fecundity; Sea urchins; Tripneustus gratilla; Spawning Induction; Larval metamorphoses | ||||
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