the water salinity ranges from - ppt is called Mariculture. Some fishes like Chanos sp, Mugil cephalus are cultured here. Culturing of animals in the salinity ranges from - ppt is called Metahaline culture. Eg, Brine shrimp ( Artemia salina) .
Artemia is commonly known as the brine shrimp. It is a crustacean and lives in high saline waters because of its high osmoregulatory capacity. . .
Fish Culture Characteristics of cultivable fishes The special characteristic features of cultivable fishes are: i. Fishes should have high growth rate in short period for culture. ii. They should accept supplementary diet.
iii. They should be hardy enough to resist some common diseases and infection of parasites. iv. Fishes proposed for polyculture should be able to live together without interfering or attacking other fishes.
v. They should have high conversion efficiency so that they can effectively utilize the food. Types of cultivable fish Cultivable fish are of types(Figure . ).
a. Indigenous or native fresh water fishes (Major carps, Catla , Labeo , Clarias ) b. Salt water fishes acclimatized for fresh water ( Chanos , Mullet). c.
Exotic fishes or imported from other counties (Common carps) Among these, major carps have proved to be best suited for culture in India, because the carps . Feed on zooplanktons and phytoplanktons, decaying weeds, debris and other aquatic plants. . They can survive in turbid water with slightly higher temperature .
Can tolerate O variations in water. . Can be transported from one place to other easily. .
They are highly nutritive and palatable. Mullet Figure . Different types of freshwater cultivable fishes Catla Common carps XI Std Biology-Zoology Chapter- External factors affecting fish culture The factors that affect fish culture are temperature, light, rain, water, flood, water current, turbidity of water, pH hardness, salinity and dissolved O . Light and temperature also play an important role in fish breeding.
Management of fish farm To culture fish, one should have an idea about different stages of fish culture such as topographic situation, quality, source,