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Category Archives for "Fisheries Biology"

Blood Circulatory System of Fishes

Table of Contents IntroductionBloodPlasmaTypes of Blood Corpuscles 1. Red Blood Corpuscles/Erythrocytes2. White Blood Corpuscle3.ThrombocyteOrigin of Blood CorpuscleFunction of BloodHeart: Structure and FunctionsHeart of CyclostomesHeart of Cartilaginous (shark) FishesHeart of Bony FishesWorking of the HeartCardio-vuscular ControlArterial System of LampreyVenous System of LampreyArterial System of Cartilaginous Fish (Scoliodon)1. Afferent Branchial Arteries of Scoliodon2. Efferent Branchial Arteries of ScoliodonAnterior […]

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Lymphatic System of Teleost Fishes

Teleost is a diverse group of ray-finned fishes which belongs to largest infraclass Teleostei under the class Actinopterygii. The group teleost includes 40 orders and 448 families with over 26000 species. They are the most advanced fish among the bony fishes. The world`s important sport and commercial fishes include this group. The length of the […]

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Arterial and Venous System of Lamprey(Petromyzon)

Lampreys are eel like scaleless and jawless animals which belongs to the family Petromyzontidae under order Petromyzontiformes of class Cephalaspidomorphi. They are found in coastal and freshwater habitats around the world except Africa. They can grow up to 100 cm in length  with well-developed eyes. They have one or two dorsal fins with seven gill […]

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Arterial and Venous System of Teleost

Teleost is a diverse group of ray-finned fishes which belongs to largest infraclass Teleostei under the class Actinopterygii. The group teleost includes 40 orders and 448 families with over 26000 species. They are the most advanced fish among the bony fishes. The world`s important sport and commercial fishes include this group. The length of the […]

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Venous system of Scoliodon

Scoliodon is an Indo-Pacific species which belongs to the family Ceacharrhinidae under order Carcharhiniformes of Class Elasmmobranchii(=Chondrichthyes). It has an elongated and spindle-shaped body which tappers at the end. The head is dorso-ventrally compressed with laterally compressed trunk and tail. The mouth is situated on the ventral side and the entire body is covered by […]

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Arterial System of Scoliodon

Scoliodon is an Indo-Pacific species which belongs to the family Ceacharrhinidae under order Carcharhiniformes of Class Elasmmobranchii. It has an elongated and spindle-shaped body which tappers at the end. The head is dorso-ventrally compressed with laterally compressed trunk and tail. The mouth is situated on the ventral side and the entire body is covered by […]

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Digestive System of Labeo rohita

Labeo rohita is the important food fish that belongs to the carp family Cyprinidae under order Cypriniformes of Class Actinopterygii. It is also known as rui, rohu, or roho labeo. It can tolerate a wider temperature range, and it is the most adaptable and important cultured fish species in Bangladesh, India, Pakistan, and Myanmar.They are […]

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Heart of Fish: Structure and Functions

The heart is a special pump device with a valve in the circulatory system. In case of fish, the heart is a folded tube that contains three or four enlarged areas. The blood brought through the veins travels from the heart to the gills through the ventral aorta and the heart always contains carbon dioxide […]

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Fish Blood: Composition, Origin and Functions

The system through which blood circulates in different organs and parts of the body is called Blood Circulatory System. The presence of well-developed circulatory system can be observed in almost all animals with few exceptions. Fish have a closed type of blood circulatory system. Food, oxygen and waste products are transported from one part of […]

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Osmoregulation in Fishes

Osmosis is the process by which the solvent enters the area from low density to high density. In this case, two different densities of a solution are separated by a differential permeable membrane. The kidneys play an important role in the osmoregulation of fish. However, most of the osmoregulatory functions are performed by other organs […]

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