Fishery by Dr. kshirsagar R.V.

1. BY
Dr.Ravindra Kshirsagar
M.Sc. Ph.D. F.G.S.B.A.S

2.  the course gives the students the necessary
basic information about fishery and
aquaculture.
 students are able to critically evaluate the
factors which are important for a sustainable
growth in the fish industry.
 Students understands different types of
fishery
 Students collects the information from local
market.

3.  Types of fisheries:
Freshwater or
Inland Fishery:
 Freshwater fishery is carried on in rivers, canals, irrigation
channels, tanks, ponds, lakes, etc. About 60 per cent of the
country’s total fish production comes from inland fisheries. (Of
late, inland fishery production has overtaken marine fishery
production.) Freshwater fishery can be divided into two
categories.

4.  Pond fisheries suitable for quick growing fishes with
non-predacious feeding habit. Examples are catla,
rohita, kalabasil, mringal, mullets, carp, etc. The other
is riverine fisheries. About one-third of the total fish
production in India comes from rivers.
 Such fishing is very active during winter season when
floods usually subside. During rainy season fishing is
poor. River fish: catla, mringal, hilsa, etc. West Bengal,
Bihar and Assam are important states for riverine
fishery.

5.  Name:
 1.Rohu (Labeo rohita)
 Mangur (Clarias batrachus)
 .Calbasu (L. calbasu)
 .Singhi (Heteropneustes fossilis)
 .Catla (Catla catla)
 .Malli (Wallago attu)
 .Singhara (Mystus seenghala)
 .Mirgala (Cirrhinus mrigala)

6.  Accounting for about 40 per cent of the total
annual production of fish and being confined
to coastal waters in the west from Kachchh,
Malabar coast to Coromandal coast in the
east, they are spread over narrow belts of
continental shelf and slope running to 5,600
km with a total fishable area of about
2,81,600 sq km.

7.  Estuarine Fisheries:
 Estuaries and their surrounding wetlands are
bodies of water usually found where rivers
meet the sea.
 This is confined to estuaries, backwaters, tidal
estuaries, lagoons, inundated—areas and swamps
along the entire coast, that is, important estuarine
areas of the Ganga, Mahanadi, Godavari, Krishna,
Cauvery, Narmada and Tapi, the brackish water
lakes of Chilka and Pulicat, and the backwaters of
Kerala. Prawn is an important variety.

8.  (i) Fish as food:
 The fish flesh is an excellent source of
protein, has very little fat, carries a good
amount of minerals and vitamins A and D and
rich in iodine. Above all man can digest it
easily.
 Fish for controlling diseases:
 Diseases like malaria, yellow fever and other
dreadful diseases that are spread through
mosquitoes can be controlled. Larvivorous
fish eat larva of mosquito. The important
larvivorous fish are Gambusia, Panchax,
Haplochitus, Trichogaster, etc.

9.  Aesthetic value:
 A large number of fish are cultured in aquarium for their beauty
and graceful movements. The important aquarium fish are
Macropodus, Trichogaster, Carassinus (gold fish) and
Pterophyllum (angel fish).
 (v) Fishery Bye-products:
 (a) Fish oil:
 It is extracted from the liver of the sharks, sawfishes, skates and
rays and has medicinal value. These mainly include cod liver oil
and shark liver oil.
 (b) Fish Manure:
 The fish waste after the extraction of oil, is used as
fertilizers,
 (c) Fish Glue:
 It is a sticky product, obtained from the skin of the
cod and is used as gum.

10.  (d) Isinglass:
 It is a gelatinous substance, obtained from the air bladder
of perches, Indian Salmons and cat fish used in the
preparation of special cement and in the clarification of
wine and beer.
 (e) Shagreen:
 The skin of sharks and rays, which has pointed and sharp
placoid scales are used in polishing the wood and other
materials. It is also used for covering the jewellery boxes
and swords,
 (f) Leather:
 A highly durable type of leather is prepared from the skin
of sharks and rays,