| Autor: |
Abou ElMaaty, Esraa E., Hanafy, Mahmoud H., Yassien, Mohamed H., Ghobashy, Abdel Fattah A., Ahmed, Mohammed I., Baeta, Marc |
| Předmět: |
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| Zdroj: |
Egyptian Journal of Aquatic Biology & Fisheries; May/Jun2023, Vol. 27 Issue 3, p381-397, 17p |
| Abstrakt: |
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. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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