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
All human bodies are made up of four different types of tissues: muscle, nerve, blood, and skin. Each tissue has its own role to play in the body. For example, skin is the largest organ in the human body. It helps protect us by keeping out pathogens and absorbing moisture. It also protects against injury … 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
Bone is a living tissue that responds to healthy or unhealthy conditions by becoming thicker or thinner. During childhood, bones are actively being built up, which slows down during the teen years. Bones are also being broken down, especially after age 20 due to wear and tear and weakening as we age. Bone tissue is … 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