Archive

Category Archives for "Fisheries Biology"

Benthos: Classification, Distribution and Importance

The word ‘benthos’ comes from the Greek word ‘bathys’ which means depth. Benthos refers to some aquatic organisms that live above, inside, or near the bottom of a body of water. Such organisms live in flowing or stagnant water bodies and are also found in salt or freshwater habitats. The sedimental organisms at the bottom […]

Continue reading

Role of Plankton in Aquaculture

Farming organisms such as fish receive nutrients other than minerals through taking food. In nature, most organisms survive by consuming live food such as plankton from the environment. However, some living organism takes dead organic particles as food. Phytoplankton is the primary food of many aquatic larvae. The larvae of most species eat completely zooplankton […]

Continue reading

Secchi Disc

Secchi disc is a simple type of round plate painted with successive black and white colors. Angelo Secchi created the Secchi disc in 1985. A thread is hung in the center of the plate or disc. The diameter of the plate is around 30 cm or 12 inches which is white-black in color.The disc is […]

Continue reading

Plankton: Definition, Classification and Facts

The term plankton was first coined by oceanographer Victor Hensen in 1887. The word plankton comes from the Greek word planktos which means to be driven or drifted away. According to him, plankton is diverse collection of small organisms and the individual organism makes up the plankton, known as plankters. Onec a that time they were […]

Continue reading

Lake: Definition, Characteristics and Classification

A lake is a large body of water that has no direct sea connection. The size and depth of the lake varies with respect to pond. In this case, limnology plays crucial role to know the basic characteristics of the lake. The lymphatic and profound regions increase in size than the litoral regionof the lake.Different […]

Continue reading

Labeo rohita and Its Life History

Labeo rohita is the important food fish that belongs to the carp family Cyprinidae under order Cypriniformes of Class Actinopterygii. There are three crucial Indian major carp (IMC) such as, Labeo rohita, Catla catla and Cirrhinus cirrhosus, of which Labeo rohita is the most highly market-priced carp fish due to its attractive taste. It is also […]

Continue reading

Catla catla and Its Life History

Freshwater fish live in freshwater habitats such as rivers, lakes, streams, ponds, ditches, marshes, flood plain, etc. About 41.24% of all known fish species occur in freshwater. The most notable freshwater fish species are Rohu, Catla, Mrigal, etc. In this article, we will discuss about the Catla calta and its life history.Systematic PositionPhylum: ChordataSub phylum: […]

Continue reading

Mrigal Carp (Cirrhinus cirrhosus) and Its Life History

Fish is one of the major sources of animal origin protein. Fisheries have a unique role in providing employment, foreign exchange earnings, and nutrition. About 65 to 70 percent of the protein we consume every day comes from fish. There are various species of fish belonging to the family Cyprinidae under the order Cypriniformes. These fish are […]

Continue reading

Food and Feeding Habits of Fish

The inland water bodies consist of small aquariums to nursery ponds, canals, beels, haor, baors(oxbow-lake), rivers, streams, flooded lands, etc. These are called freshwater basins.  The more diverse fish types are found in these water bodies.The shape, nature, feeding habits, color, etc. vary from species to species.  Their cultivation system is also different. It is […]

Continue reading

Fish Food and Types: Natural and Supplementary Food

Fishes are cold-blooded vertebrate aquatic animals. They prefer to feed various types of food due to their different food and feeding habits. Among them, some feed on plant-based food and some like to eat animal-based foods while many fish species take both plants and animals based food and they are known as omnivorous. In this […]

Continue reading