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Category Archives for "Fisheries Biology"

Excretion in Fish

Different parts of the body, especially the excretory system, are involved in the removal of waste products produced by metabolism. The process of removing nitrogenous wastes from the body is called excretion. The subsidiary system of excretory function is known as excretory system. These excretory substances are formed by the accrual reaction of amino acids. […]

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Swimbladder: Structure, Types, Modifications and Functions

The sac-like structure between the intestines and the kidneys of most fish is called a swimbladder. However, many times it is also called gas or air sac. It contains a mixture of carbon dioxide (CO2), oxygen (O2) and nitrogen (N2) gases. With the exception of a few areas, almost all bony fish contains swimbladder. The […]

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Weberian Apparatus

The skeletal chain formed by the four ossicles connecting the anterior chamber of the perilymphatic sac and the swimbladder, known as the Weberian apparatus. Scientist Weber discovered them in 1820, hence the name Weberian Apparatus.The bones are the tripus, the claustrum, the intercalarium, and the scaphium. Of these, the tripus, intercalarium, and scaphium are involved […]

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Respiration in Fish

Respiration is a biochemical process by which food in the cell is oxidized with the help of oxygen to produce energy and carbon dioxide (CO2) is released as a by-product. All kinds of biological function require such energy. Carbohydrates are mainly involved in energy production. In the absence of carbohydrates, this energy is produced by […]

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Accessory Respiratory Organs of Fishes

In addition to the gills, all other respiratory organs that exist in different fish are called accessory respiratory organs. For adaptation to special environments, these accessory respiratory organs are developed as an additional part of the gills in fish. In most cases, tropical freshwater fish are seen to develop these organs, but this is very […]

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Endocrine System of Fishes

The endocrine system consists of a number of glands called endocrine glands which are spread over different areas of the fish body. The endocrine glands usually control the long-term activity of the target organ and control various physiological processes such as digestion, metabolism, growth, development, reproduction, etc. Animals have two types of glands called exocrine […]

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Growth Rate and Survival Rate of Fishes

Significant parameters of intensive study of fish biology are observation of growth. It provides ideas about the health of single fish and the population. The growth of an organism can be defined by changes in body size over time. Since the age and growth of the fish are closely related, the age and growth rate […]

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Electric Organs in Fishes

Many fish have special organs that can generate electricity. Electrical organs are advanced and specialized structures that enable the carrier to generate, store, and release electricity. Only fish has the ability to generate this electricity in the animal kingdom. About 250 species of cartilaginous and bony fish can generate this electricity. This organ has been […]

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Non-conventional Feed Resources(NCFR)

There are many types of food ingredients that do not have a scientific explanation for their use. This type of supplemental food or food ingredient is called NCFR or non-conventional feed resources. Such food items are separated from grains and agricultural by-products. NCFR or unconventional food is not commonly used commercially for cattle, poultry and […]

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Feeding of Culture Fish

Fish take food from the aquatic environment for life sustaining, body building and growth. Different species of fish feel comfortable in different aquatic environments. The foods that fish consume from different aquatic environments are varied. Fish consume a large number of living ingredients and inert substances as food. Fish eating techniques are more diverse and […]

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