Biological Aspects of Mountain Carp Labeo dyocheilus (Mcclelland), from Dau Dam, Thana Ahmed Khan, Sindh, Pakistan

Abstract

Labeo dyocheilus is commonly recognized as “Hill Stream”, found in different Asian countries such as Afghanistan, Butan, India, and Pakistan with habitat of rivers, channels, stream, and mountain torrents. Sex ratio, breeding season, length at first maturity fecundity and reproductive season of L. dyocheilus were studied. Fish specimen was collected from Dau Dam, Thano Ahmed khan District Jamshoro Sindh Pakistan during February to November 2015 by use of gill net (Fish caching method). Samples comprised 341 individuals (164 male and 177 female) for calculating the (length-weight) relationship and reproductive attributes of the species. The female population slightly outnumbered male population with a ratio of 1.0:1.07. Fecundity analysis was based on 107 female (average fecundity 1856.77, fecundity varied from 2881 to 61146. The value of coefficient of determination r² generated by regression between Gonadal weight-fecundity was 0.83.total weight-fecundity gave r² 0.62.Total length-fecundity gave r² was 0.67. Gonadal weight-fecundity gave r² 0.8375 Confirmed to the general pattern of reproduction, where gonadal weight has substantial impact on fecundity. Gonado-somatic Index peaked in July and declined gradually till October, suggesting that reproductive activities of the species peak during hot summer / monsoon season. The present study provides the baseline information about reproductive biology of cultured or harvested fishes will be helpful for management.