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. … Read more
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 … Read more
The lungfish is the oldest living animal on earth. It lives in muddy waters in Africa, South America, and Australia. What seems most surprising about these creatures is that they can survive without breathing air. They have developed the ability to respire through their skin, mouth, and gills. These fish can live without oxygen for … Read more
Various ingredients are used in the preparation of supplementary food to meet the nutritional needs of fish. Foods and prepared feeds are processed to improve the nutritional value of these ingredients. The reasons why food is processed are: (1) to facilitate the movement of food; (2) can be shaped like a pellet; (3) the quality … Read more
A system known as the digestive system has been developed in vertebrates to perform the functions of food swallowing, digestion, absorption and assimilation and excretion of indigestible parts. Most of the food changes and becomes simple and soluble so that it can be easily absorbed by the blood and lymph. Such mechanical and chemical breakdown … Read more
Introduction 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 … Read more