IMPACT OF WATER QUALITY PARAMETERS ON THE AVAILABILITY OF FISH LARVAE AT KUMIRA, CHATTOGRAM

Abstract

The goal of the current experiment was to determine how fish larvae availability was impacted by water quality. Water and larvae samples were collected in this following time (January, 2021 to December, 2021) by per month sampling period from the coastal area of Kumira, Chattogram, Bangladesh. Surface water temperatures (ºC) varied from 22.5 to 31.8 whereas salinity values (ppt) varied from 2 to 16 and the pH ranged between 6.94 and 9.17. Total dissolved solids (g/L) content varied from 1.45 to 6.56. The ranges of ammonium ion (mg/L) and toxic ammonia (mg/L) content varied from 0.0224 to 1.0220 and 0.0009 to 0.0672 respectively. The amount of alkalinity (mg/L) and total hardness (mg/L) content varied from 51.3 to 369 and 320.8 to 906.3 respectively. The ranges of nitrite (mg/L) was found 0.023 to 1.320. Water quality parameters showed some significant relations among them in different seasons. The water quality parameters were collected by monthly basis during the sampling period. Larvae were categorized in two different types. Finfish and crustaceans showed some significant relationship among the different water quality parameters. The maximum and minimum number for finfish was 93 and 17 respectively; for crustaceans the amount of it was 571 and 44 respectively during the study period. The larvae samples were collected by using push net on monthly basis during the sampling period. Sudden fluctuation of water quality parameters, pollution, and food availability might be the reasons behind that. The findings of this study would help to know the overall condition of fish larvae on Kumira and the impact of water quality on them. It would be helpful for policymakers in improving management practices for maintaining water quality and conserving the fish larvae population