Finfish Breeding and Hatchery Management

Identification of sex of brooders
● Identify the sexes by observing the external morphological characters like genital aperture, shape of abdomen, colouration of fins, size of fish, etc.
● The keys used for the identification of sex of brooders are as follows:

S.NO	FEMALE	MALE
1	Larger in size, slightly smaller pectoral fin	Smaller in size, slightly larger pectoral fin
2	a few ova discharged on applying pressure on abdomen	milt oozes out on applying pressure on abdomen
3	Pectoral fin brighter, body stouter	Pectoral fin duller, body linear

Water quality
● Monitor water quality parameters such as temperature, dissolved oxygen, pH, CO₂, alkalinity, hardness and ammonia at fortnightly intervals.