Reproductive biology of Oreochromis niloticus (Perciformes: Cichlidae) at Emiliano Zapata dam, Morelos, Mexico
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| Autoři: | , , , |
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| Médium: | artículo original |
| Stav: | Versión publicada |
| Datum vydání: | 2005 |
| Popis: | The reproductive season of tilapia was studied by monthly samplings at Emiliano Zapata dam, Morelos State, Mexico. From February 1999 through February 2000 a sample of 50 fish was taken from the commercial catch (castnet, 6.5 cm of mesh size). The observed sex ratio was 1:1.29 (females:males) (χ²=10.26; p<0.05). The tilapia reached maturity at 151.3 mm (females) and 152.0 mm (males) of total length. Rainy (August) and dry (February) seasons were determined as the breeding period. Fecundity variation was better correlated with length (r=0.7473; p<0.002) than with weight (r=0.7395; p<0.002). The fecundity ranged between 243 and 847 oocytes per fish, with egg diameter from 300 to 3 700 μm. Intensive breeding activity in August and February coincide with phytoplankton biomass increase. |
| Země: | Portal de Revistas UCR |
| Instituce: | Universidad de Costa Rica |
| Repositorio: | Portal de Revistas UCR |
| Jazyk: | Inglés |
| OAI Identifier: | oai:portal.ucr.ac.cr:article/14666 |
| On-line přístup: | https://revistas.ucr.ac.cr/index.php/rbt/article/view/14666 |
| Klíčové slovo: | reproduction oreochromis niloticus gonadosomatic index hepatosomatic index fecundity reproducción índice gonadosomático índice hepatosomático fecundidad |