Freshwater fish live in freshwater habitats such as rivers, lakes, streams, ponds, ditches, marshes, flood plain, etc. About 41.24% of all known fish species occur in freshwater. The most notable freshwater fish species are Rohu, Catla, Mrigal, etc. In this article, we will discuss about the Catla calta and its life history. Systematic Position Phylum: … Read more
The thyroid gland is a butterfly-shaped endocrine gland. It is brownish-red that rich in blood vessels. Vital nerves that are responsible for voice quality also pass through the thyroid gland. The thyroid gland is found in all vertebrate, but they are quite variable to shape and anatomical position. In some lower vertebrates, only thyroid follicles … Read more
The class Amphibia belongs to the subphylum Vertebrata of phylum chordata. All the representatives of Clssa Amphibia are ectothermic, tetrapod vertebrate animals which inhabit a wide variety of habitats including terrestrial, arboreal, fossorial, or freshwater aquatic ecosystems. The name amphibian is derived from Greek word “amphibious” which means “living a double life”. Because some species … Read more
The liquid filled cavity between alimentary canal and body wall of multicellular triploblastic animals is known as body cavity. Generally, the body cavity that is lined by mesodermal peritoneal membrane is known as coelom. According to Hyman (1955), coelom is the hollow space between alimentary canal and body wall which is lined by mesodermal peritoneal … Read more
Hepatitis is actually the inflammatory condition of the liver. The word “hepatitis” is derived from the Greek word ‘hepar’ and Latin word ‘itis’. In this case, ‘hepar’ means liver and ‘itis’ means inflammation. It is generally caused by a viral infection but other possible causes are available including autoimmune hepatitis and it also occurs as … Read more
There are two types of glands in the body such as endocrine glands and exocrine glands. Endocrine glands are also known as ductless glands that constitute the endocrine system. The endocrine system forms network in the body and produce hormones directly into the blood stream. Endocrine glands perform various functions in the body. They influence … Read more