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Category Archives for "Fisheries Biology"

Fish Nutrition: Definition and Importance

Every living thing consumes food for maintaining its life or for conducting physiological functions like body growth, movement and reproduction. An organism collects the necessary food from its surroundings. This food is used directly or is used by the body in the form of simple products. Digestion is the process by which the body turns […]

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Fish Feed Preparation and Formulation

Most aquatic farming systems are intensive or semi-intensive, especially for fish and shrimp. Intensive fish farming requires extra food for stocked fish. As a result, the cost of such cultivation is high. The main purpose of food preparation is to mix nutritional value and balanced ingredients which keep the growth, reproduction and health of the […]

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Fish Feed Additives

Additives are those materials which are used as small quantity in the fish feed during feed preparation to increase feed attraction, palatable to the species under culture system and to prevent disease, and microbial activities and to enhance the horse power efficiency of feed.Additives is being used in animal feedstuff including-Synthetic amino acidsVitaminsBindersAntioxidantsPreservativesProphylactic medicines(antibiotics)HormonesAntimicrobial agentsFeeding […]

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Lateral Line System of Fishes

A specialized organ or structure, such as the eye, ear, tongue, nose, or skin, in which a large number of sensory neurons are concentrated and which acts as a receptor component, is called a sensory organ. It is also called the recipient organ. Sensory organs receive physical or chemical stimuli from the environment. The dermal […]

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Osteichthyes: Characteristics, Classification and Examples

Osteicethyes is the largest class of superclasses Pisces under the subphylum Vertebrata (phylum: chordata). True bony fish belong to this category. They originated in the early Silurian period and in the middle of the Devonian period there was a massive adaptive dispersion between them. Among the vertebrates, the largest variety exists in bony fishes. Scientists […]

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Tilapia: Physical Description, Habitat, Reproduction and Economic Importance

Tilapia (Oreochromis mossambicus) belongs to the family Cichlidae under order Perciformes of class Actinopterygii. The English names are Tilapia, Mozambique Cichlid, Mozambique Tilapia, Java Tilapia, Miracle Fish (Indonesia).  It is native to inland and coastal waters in southeastern Africa, from the Zambezi basin in Mozambique, Malawi, Zambia and Zimbabwe to Bushman river in the province […]

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Fish Scales: Types, Development and Functions

Scales are  small plate-shaped dermal or epidermal structures that are found in the outer skeletons of fish, reptiles, or some mammals. The skeletons of many vertebrates are covered by two types of scales, namely epidermal and dermal. Epidermal scales originate from the malpighian layer of the epidermis. Such scales are found in terrestrial vertebrates such […]

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Amino Acid Requirements of Fish

The unit of protein formation is the amino acid.  23 types of amino acids have been isolated from natural proteins. 10 of them are essential for fish. Animals cannot make essential amino acids. So these have to be taken with food. The quality of food depends not only on the amount of nutrients, but also […]

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Carbohydrate Requirements of Fish

Carbohydrates are a large organic group that contains glucose, starch and cellulose. Its common feature is that it contains only carbon, hydrogen, and oxygen, and their combustion produces carbon dioxide and one or more molecules of water. The simplest carbohydrates are the three carbons that play an important role in metabolism at the secondary level. […]

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