Salmonid fishes viz. pacific salmon (oncorhynchus sp.) Atlantic salmon (Salmo sp.)
Trouts are grown in cold areas of world. Both pacific salmon & Atlantic salmon are Anadromous fishes and they need saline environment for growth.
But trouts can be grown in inland waters.
Contribution of salmonid to global aquaculture production of fishes is next to that of carps. Hundreds of hatcheries operate in several parts of cold areas of the world which are meant not only for providing stocking materials for aqua farms but also for stock enhancement in natural waters through ranching.
Hatcheries of oncorhynchus and Salmo sp.Are engaged in the production of smolt for farming and ranching.Trouts hatcheries are established in several cold regions of the world including India. In India trouts were introduced from other countries. Mahseer found in the cold streams and lakes are endogenous fishes in India.
The right of children to free and compulsory education act, 2009mahesh lone
children's right for free and compulsory education. it is right of children from six years to fourteen years for free education in their neighborhood school. The Act laids down responsibility on Government, School and parents.
The right of children to free and compulsory education act, 2009mahesh lone
children's right for free and compulsory education. it is right of children from six years to fourteen years for free education in their neighborhood school. The Act laids down responsibility on Government, School and parents.
5th International Disaster and Risk Conference IDRC 2014 Integrative Risk Management - The role of science, technology & practice 24-28 August 2014 in Davos, Switzerland
33. DEVELOPMENT OF EGGS:
The fertilized egg undergoes development till the embryo is fully ready to
hatch out the eggs.
The four stages of importance from the point of view of a pisiculturist are
•Green egg
•eyed eggs
•alvin or sac fry
•Swim up fry.
The newly fertilized egg is called green egg because of the greenish tinge of
colour of the egg.
In course of development when the embryo develops eye which is visible
through the egg envelope it is called quiescent at the bottom of the incubation
apparatus. It may take 15-18 days for the yolk sac to be absorbed in rainbow
trout. When 2/3 of the yolk sac is absorbed, larva starts moving towards
water surface and this stage is called swim up fry. At this stage it starts active
feeding.
34. CARE OF EGGS DURING INCUBATION:
CONTINOUS AND UNIFORM WATER FLOW:
The incubation unit has to be supplied with a continuous and
uniform flow of water so that eggs are bathed in fresh water
always.
The rate of water flow can be 0.2 to 0.3 lit./min/1000 eggs.
This ensures not only the required dissolved oxygen level in
the rearing medium but also the removal of metabolic waste
from it.
Water supply for the trout hatchery shall be from rheocrene or
limnocrene spring.