Reproductive biology ofSarotherodon mossambicus, an introduced species, in an ancient man-made lake in Sri Lanka

Autor:	Sena S. De Silva, J. Chandrasoma
Rok vydání:	1980
Předmět:	Ecology media_common.quotation_subject Zoology Introduced species Aquatic Science Biology Fecundity Monsoon Reproductive biology Fish Reproduction Sri lanka Ecology Evolution Behavior and Systematics Sex ratio media_common
Zdroj:	Environmental Biology of Fishes. 5:253-259
ISSN:	1573-5133 0378-1909
DOI:	10.1007/bf00005360
Popis:	The reproductive biology ofSarotherodon mossambicus (Peters), a species exotic to Sri Lanka, was studied in Parakrama Samudra — an ancient man-made lake. Females outnumbered males by approximately 2 to 1, but the predominanace of females tended to decrease with increasing size. Males mature at a length of 27.5 cm and females at a length less than 15.0 cm.S. mossambicus breeds throughout the year with four possible peak periods, which coincide with the tailend of the monsoon and intermonsoon rains. The egg diameter distribution indicates the presence of reserve oocytes and yolked oocytes, the latter falling into a single mode between 1.2 to 3.6 mm. Fecundity varied between 360 and 1775 for fish ranging in length from 20.0 to 31.9 cm and 145 to 538 g in weight. The diameter of nests increased with depth up to 60–65 cm. Nests were not found in depths over 90 cm.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::e37ef01127389f9a5077e74d096d52f9 https://doi.org/10.1007/bf00005360 Zobrazit plný text záznamu Full text from SpringerLink