Reproductive Biology of Puntius sarana, an indigenous species, and Tilapia rendalli (melanopleura), an exotic, in an Ancient Man-Made Lake in Sri Lanka

Autor:	J. Chandrasoma, S. S. Silva
Rok vydání:	1981
Předmět:	Female to male Puntius food.ingredient biology Ecology Zoology Tilapia Aquatic Science biology.organism_classification Fecundity Indigenous Breed food Reproductive biology Sri lanka
Zdroj:	Aquaculture Research. 12:17-28
ISSN:	1365-2109 1355-557X
DOI:	10.1111/j.1365-2109.1981.tb00003.x
Popis:	Investigations on the reproductive biology of Puntius sarana an indigenous species and Tiiapia remialli (melanopleura) an exotic, in an ancient man-made lake, Parakrama Sarnudra (Sea of Parakrama), in Sri Lanka, carried out from February 1978 to May 1979 are presented. The overall female to male ratio in T. rendalli and P. sarana were 1.1:1.0 and 1.5:1.0, respectively. Considerable deviation from the mean ratio was observed and are attributed to their spawning behaviour and migrations. In the larger size groups in T. rendalti males were dominant while the reverse was observed in P. sarana. Both species were found to breed through out the year, with well defined peaks in the case of P. sarana which were coincidental with the main rainy seasons. Both species are multiple spawners, fecundity ranging from 760 to 6160 in T. rendalli with length and weight varying from 18.8 to 25.8 cm and 126 to 380 g, respectively. In P. sarana. with a length of 23.8–38.0cm and a weight of 180–792 g, fecundity ranged between 16,000 and 290,000.
Databáze:	OpenAIRE
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