The endocrine system consists of a number of glands called endocrine glands which are spread over different areas of the fish body. The endocrine glands usually control the long-term activity of the target organ and control various physiological processes such as digestion, metabolism, growth, development, reproduction, etc. Animals have two types of glands called exocrine … Read more
There are about 8100 known living amphibians, of which nearly 90% are frogs. Amphibians first appeared about 340 MYA (million Years Ago) ago during the Middle Mississippian Epoch of the Paleozoic Era. Frog, newts, toads, caecilians, salamanders are the modern amphibians which have various characteristic features. Parental Care of Amphibia Parental care is one type … Read more
The tissue which are responsible for locomotion and for the movement of the different body parts is called muscular tissue. The muscle cells are often called muscle fibres due to elongated shapes of the cells. Muscle tissue is a specialized tissue which composed of fibres of muscle cells. They control the movements of an organisms … Read more
Fish feed 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 … Read more
Wuchereria bancrofti is a filarial nematode worm. Adult Wuchereria bancrofti lives in lymphatic vessels and lymph nodes of human and cause lymphatic filariasis. It causes diseases together with Brugia malayi and B. timori. Various mosquitoes are responsible to spread the filarial worms. It affects over 120 million people throughout the world. If infected people do … Read more
The word ‘chondrichthyes’ came from Greek word ‘chondr’ meaning cartilage and ‘ichthys’ meaning fish. Chondrichthyes include all the cartilaginous fishes that contain cartilaginous skeletons. All the representatives of this group have jaws and paired fins with paired nares. The body is covered with placoid scales. Their body growth range from 10 cm (finless sleeper ray) … Read more