![]() The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". The cookie is used to store the user consent for the cookies in the category "Analytics". This cookie is set by GDPR Cookie Consent plugin. These cookies ensure basic functionalities and security features of the website, anonymously. Necessary cookies are absolutely essential for the website to function properly. Principles of Inheritance and Variation.New Questions and Answers and Forum Categories ![]() In some other deep-sea fishes, eyes are very small as they are of little apparent use, and still others are without eyes. In some deep-sea fishes the retina is composed of a number of tiers of rods, presumably arranged to absorb all the limited light that enters the eye (Nicol, 1989). Some deep-sea fishes exhibit greatly enlarged eyes or the so-called telescopic eyes, which are highly effective in visioning lights of very low intensity. Their hearts are very small, they have very little red muscle and low haematocrit values. Even without gas-filled swim bladders, they are near neutral buoyancy. In some of them e.g., angler fish (Melanocetus) and gulper eel (Eurypharynx) the water content is very high, about 95%. Some bathypelagic fishes are economy’ designs showing reduction of bony skeletons except for their jaws and contain watery muscles. Due to extreme pressure the bodies i deep-sea fish and other animals are very much compressed. The amount of detritus coming into deeper waters depends on seasonal production cycles at the surface. Because of lack of cues like light and temperature change, it was once thought that there was no seasonality in the deep sea, but this is not so. It is characterized by high pressure, low temperature, absence of light, calmness of water, absence of phytoplankton and other producers, scarcity of food and resulting competition and soft bottom.Īpart from containing bacteria and perhaps fungi, the community of aphotic zones is characteristically animal. ![]()
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