Open AccessImproved Seed Production of Goldstriped Amberjack Seriola lalandi under Hatchery Conditions by Injection of Triiodothyronine (T 3 ) to Broodstock Fish
Author(s) -
Tachihara Katsunori,
ElZibdeh Mohammad Khalil,
Ishimatsu Atsushi,
Tagawa Masatomo
Publication year - 1997
Publication title -
journal of the world aquaculture society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.655
H-Index - 60
eISSN - 1749-7345
pISSN - 0893-8849
DOI - 10.1111/j.1749-7345.1997.tb00959.x
Subject(s) - broodstock , hatching , biology , hatchery , zoology , fishery , triiodothyronine , aquaculture , fish <actinopterygii> , hormone , endocrinology
Survival of the seed of goldstriped amberjack Seriola lalandi was consistently enhanced by intramuscular injection of triiodothyronine (T 3 ) to the broodstock fish at a dose of 20 mg/kg body weight. Survival rates at the time of transfer to net cages (35 d after hatching) were 2.6–5.0% for the T 3 treatment while only 0.3–2.1% for the control. Survival rates 36 mo after hatching was estimated to be 12 times higher in the T 3 ‐treated group (1.1%) than in the control (0.09%). T 3 concentration in newly spawned eggs increased from control levels of 0.3–1.0 ng/g to 68–127 ng/g 2 d after injection and subsided with successive spawns. T 3 concentration in the treated larvae was about 360 times higher than in the control upon hatching (29 np/p vs 0.08 ng/g), but became indistinguishable from the control 6 d after hatching. These results indicate injection of T 3 to the broodstock of S. lalndi to be of practical value in aquaculture of the species.