Welcome to the kingdom of BIOLOGY! This is you, me and everybody. This is about us. Thanks for visiting this site.
You all are welcome!
Tuesday, August 24, 2010
Sunday, June 20, 2010
Saturday, June 19, 2010
Friday, June 18, 2010
Wednesday, June 9, 2010
Importance of fish culture:
The production of fishes is not in harmony with the population growth. So fish culture is very important in Bangladesh-
a. Meet the demand of protein: At present only 4 gram of protein is available per head, but each person should consume at least 12 grams of protein. To meet this demand, it is necessary to produce annually 26 lac tons of fishes in our country.
b. Large amount of foreing currency is earned by exporting fishes and fish products.
c. We can earn livelihood by catching fish, selling nets and instruments to catch fishes and by working in the fish farms.
d. A large amount of money can be earned by engaging oneself with fish processing industries.
e. We can compensate the deficit of protein through the increased production of fish.
f. By cultivating fish we can develop our national economy.
Tuesday, June 8, 2010
fish resources
Fishes take part in different ways in the economic development of man. About 80% of protein food of Bangladesh comes from fishes. Large amount of foreign currency is earned by exporting fishes and fish products. So all marine and fresh water fishes together are called fish resources.
Carp culture
Carps:
Fishes which live on algae, phytoplankton etc. is called carps.
Example: Ruhi, Catla, Mrigal etc.
Fishes which live on algae, phytoplankton etc. is called carps.
Example: Ruhi, Catla, Mrigal etc.
Fish culture
Fish culture generally means the rearing and taking care of fishes in internal fresh water.Identifying external characters of fishes.i. Boat or spindle shaped body:
The mid portion of the body is wider and the two ends are gradually narrows. This type of body shape help in the movement in water.
ii.Various types of fins:
A pair of pectoral fins and a pair of pelvic fins take part in swimming. Besides these they have dorsal fins, an anal fin and a caudal fin. These fins control the direction of movement.
iii.Various types of scale:
Small or large type of scale are present in different fishes. There are some fishes which are devoid of scales.
iv.Mucous: Mucous is a slimy, liquid substance secreted from the body of fishes which helps in the protection of fishes.
V.Lateral line organs: On the either sides of the body of fishes there is a long lateral line below which are located sensory cells. These lines can perceive the conditions of surrounding medium.The sources of fresh water fishes of Bangladesh.
As the source of fresh water fishes, the Padma, Meghna, Jamuna, Barmaputra, Karnafuly etc. are worth mentioning.They are also found in large numbers in small rivers, Ponds, Canals, Jheels etc of the country.In the kaptai lake, haors and Jheels of Sylhet and Barisal, large number of carp fishes and their fries are available.
The mid portion of the body is wider and the two ends are gradually narrows. This type of body shape help in the movement in water.
ii.Various types of fins:
A pair of pectoral fins and a pair of pelvic fins take part in swimming. Besides these they have dorsal fins, an anal fin and a caudal fin. These fins control the direction of movement.
iii.Various types of scale:
Small or large type of scale are present in different fishes. There are some fishes which are devoid of scales.
iv.Mucous: Mucous is a slimy, liquid substance secreted from the body of fishes which helps in the protection of fishes.
V.Lateral line organs: On the either sides of the body of fishes there is a long lateral line below which are located sensory cells. These lines can perceive the conditions of surrounding medium.The sources of fresh water fishes of Bangladesh.
As the source of fresh water fishes, the Padma, Meghna, Jamuna, Barmaputra, Karnafuly etc. are worth mentioning.They are also found in large numbers in small rivers, Ponds, Canals, Jheels etc of the country.In the kaptai lake, haors and Jheels of Sylhet and Barisal, large number of carp fishes and their fries are available.
Subscribe to:
Posts (Atom)