A Study on Fish Reproduction for The Prevention of Species Loss Due to Batik Waste Pollution

Abstract

Environmental factors, such as textile waste water, affect fish by interfering its reproduction. This study was conducted to examine reproductive performance of fish inhabiting a river that receive batik waste. The fish samples were collected in 5 stations representing upstream area, effluent disposal area, and downstream area. Sex ratio, Gonado Somatic Index (GSI), Hepatosomatic Index (HSI) of female and male was examined, and physicochemical water parameters of each station were measured. Ten species of 8 families were captured. Anabas testudinaeus (n=101), Trichogaster trichopterus (n=310), Mugil sp (n=3), Scatophagus argus (n=8), Valamugil speigleri (n=11), Channa striata (n=2), Bagrus nemurus (n=1), Laiognathus fasciatus (n=2), Oreochromis niloticus (n=1), O. mossambicus (n=5). Mugil sp, V. speigleri, and L. fasciatus were juvenile, and found at the downstream area. The GSI of female and male A. testudinaeus were 0.31-5.52% and 0.34-3.32%; the HSI was 0.77-2.01% and 0.68-1.79%. The GSI of female and male T. trichopterus were 0.12-7.9% and nd-3,7%; the HSI was 0.77-2.17% and 0.6-2.0%. The BOD level ranged from 13.81±6.13 to 47.58±32.59 mg.L-1, COD was between 190±80 and 435±196 mg.L-1, DO was from 0 to 1.37±1.62 mg.L-1, level phenol ranged from 0.50±0.34 to 4.20±1.6 µg.L-1. Fish of Meduri River were reproductively active but only those resistant to low water quality reproduced successfully.