Reproductive biology of Oreochromis niloticus (Perciformes: Cichlidae) at Emiliano Zapata dam, Morelos, Mexico

 

Wedi'i Gadw mewn:
Manylion Llyfryddiaeth
Awduron: Peña-Mendoza, B, Gómez-Márquez, J L., Salgado-Ugarte, I H, Ramírez-Noguera, D
Fformat: artículo original
Statws:Versión publicada
Dyddiad Cyhoeddi:2005
Disgrifiad: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.
Gwlad:Portal de Revistas UCR
Sefydliad:Universidad de Costa Rica
Repositorio:Portal de Revistas UCR
Iaith:Inglés
OAI Identifier:oai:portal.ucr.ac.cr:article/14666
Mynediad Ar-lein:https://revistas.ucr.ac.cr/index.php/rbt/article/view/14666
Allweddair:reproduction
oreochromis niloticus
gonadosomatic index
hepatosomatic index
fecundity
reproducción
índice gonadosomático
índice hepatosomático
fecundidad