Larval performance of matrinxã,Brycon amazonicus(Spix & Agassiz 1829), after maternal triiodothyronine injection or egg immersion
| Autor: | José Augusto Senhorini, Flávio Daolio Gonçalves, Lúcia Helena Vasques, Valéria Leão Souza, Elisabeth Criscuolo Urbinati |
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| Rok vydání: | 2008 |
| Předmět: | |
| Zdroj: | Aquaculture Research. 39:1355-1359 |
| ISSN: | 1365-2109 1355-557X |
| DOI: | 10.1111/j.1365-2109.2008.02002.x |
| Popis: | This study compared the larval performance of matrinxa� , Brycon amazonicus ,a fter maternal triiodothyronine (T3) injection or egg immersion of T3. In the ¢rst experiment, three groups of females (n 5 4) induced to spawning received pituitary extract (CPE) and a corn oil injection (control), or CPE plus 10 mg or 20 mg kg � 1 bw T3 dissolved in corn oil (experimental). Larvae were sampled for body weight and length measurement at hatching (0 h) and12, 24, 36, 48 and 60 h thereafter. Hatching time, hatching success and abnormal development were monitored. In the second experiment, fertilized eggs from four females were immersed inT3 solutions (0,0.01,0.05 and 0.10 mg L � 1 ) and larvae were sampled at hatching (0 h) and 6, 18, 30, 42, 54, 126 and 198 h thereafter. Hatching time was not aiected by either means of hormone treatment. Abnormalities decreased as the T3 concentration increased in larvae from T3-treated brood¢sh but the number of dead larvae increased proportionally. Larvae from T3-injected females had higher weight from 24 h after hatching and greater length from hatching, while the weight of larvae produced from T3-immersed eggs changed at 198 h and length from 126 h of rearing. Both routes of T3 administration aiected the early growth of matrinxa� but the eiect was observed earlier when broodstock females were injected. |
| Databáze: | OpenAIRE |
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