Many fish have special organs that can generate electricity. Electrical organs in fishes 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 … Read more
The nutritional value of food depends not only on its chemical composition but also on the amount of nutrients or energy. Digestion is the fraction of nutrients or energy in swallowed food that is not excreted in the feces. Digestibility determines the amount of digestion and the relative measure of how much food and nutrients … Read more
The nervous system of Rohu fish (Labeo rohita) is divided into the following three parts: A. Central nervous system B. Peripheral nervous system and C. Autonomic nervous system. A. Central Nervous System The central nervous system is made up of the brain and spinal cord. The brain of the Rohu fish is divided into three … Read more
Leishmania donovani is a protozoan parasite which belongs to the family Trypanosomatidae under the phylum Euglenozoa. It is an obligate parasite which requires a host for completing their life cycle. It is responsible for the disease, known as leishmaniasis. Over 50 species belong to genus Leishmania were described worldwide; among them about 20 species are … Read more
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 … Read more
The number of living fish species is over 26,400 which is 51.9% of almost all vertebrates. Like other vertebrates, fish have an unequal abundance and diversity. Their ancestors were widespread 500 million years ago. They spread through a massive time-wide evolution and had the opportunity to originate and become extinct in major phyletic streams, even … Read more