30/01/2023
Fish farming is a very good and viable business one can venture in, but it is very important to know the biological make up of the fish for you to fully understand what the fish needs, when it needs it and how it needs it.
let start with the developmental stages of the fish which are as follows:
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๐The larvae emerging from the fertilized eggs after hatching is called hatchling.
๐It is characterized by the presence of yolk sac hanging below from where it draws its nutrition for 2โ3 days.
๐At this stage the mouth is not formed and hence it does not take food from outside.
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๐As soon as the yolk sac of the hatchling is absorbed it is known as spawn.
๐At this stage the mouth is formed and it starts taking small zooplankton like rotifers and supplementary feed like egg yolk, finely powdered oil cake, rice bran etc.
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๐As soon as the spawn assume the shape of the fish and grow to about 1โ2 cm it is known as fry
๐At this stage they are primarily smaller size zooplankton feeder.
๐It takes about 7 to 10 days for the spawn to grow up to fry stage.
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๐As soon as the fry grow up to 10โ15 cm size or roughly equal the size of a finger it is known as fingerling.
๐Fingerling is the proper size for stocking in table fish production ponds.
๐It takes about 30โ60 days for the fry to grow up to fingerling size.
