The dermis is a layer of skin between the epidermis (with which it makes up the cutis) and subcutaneous tissues, that consists of connective tissue and cushions the body from stress and strain.t also contains Mechanoreceptors that provide the sense of touch and thermoreceptors that provide the sense of heat. In addition, hair follicles, sweat glands, sebaceous glands, apocrine glands, lymphatic vessels and blood vessels are present in the dermis.
1.1 DEFINITION. Aquaculture is the farming of aquatic organisms, including fish, molluscs, crustaceans and plants. It implies some form of intervention in the rearing process to increase production, such as regular stocking, feeding and protection against predators.
Before we get to the types, I would like to mention some benefits of algae. That's right, algae can serve a purpose! The main benefit of algae is that it helps clean the water in the tank. Green algae is just like the higher plants, in that it uses organic wastes in the water and produces oxygen. Another benefit of algae is that it can provide an alternative food source for omnivorous and herbivorous fish, especially small fry from egglayers who may sometimes survive on green water.