Roe (/ r oʊ / ROH) or hard roe is the fully ripe internal egg masses in the ovaries, or the released external egg masses, of fish and certain marine animals such as shrimp, scallop, sea urchins and squid.As a seafood, roe is used both as a cooked ingredient in many dishes, and as a raw ingredient for delicacies such as caviar.. The roe of marine animals, such as the roe of …

In fish anatomy and turtle anatomy, a barbel is a slender, whiskerlike sensory organ near the mouth.Fish that have barbels include the catfish, the carp, the goatfish, the hagfish, the sturgeon, the zebrafish, the black dragonfish and some species of shark such as the sawshark.Barbels house the taste buds of such fish and are used to search for food in murky water.

Aristotle (ca. 340 B.C.) may have been the first scientist to speculate on the use of hard parts of fishes to determine age, stating in Historica Animalium that “the age of a scaly fish may be told by the size and hardness of its scales.” However, it wasn't until the development of the microscope that more detailed studies were performed on the structure of scales.

Etymology. The term ichthyophobia comes from the Greek ἰχθῦς - ichthus, meaning "fish" and φόβος - phobos, "fear". Galeophobia comes from the Greek γαλεός - galeos, "small shark".. Phobia. Ichthyophobia is described in Psychology: An International Perspective as an "unusual" specific phobia. Both symptoms and remedies of ichthyophobia are common to most specific …

Batoidea is a superorder of cartilaginous fishes, commonly known as rays.They and their close relatives, the sharks, comprise the subclass Elasmobranchii.Rays are the largest group of cartilaginous fishes, with well over 600 species in 26 families. Rays are distinguished by their flattened bodies, enlarged pectoral fins that are fused to the head, and gill slits that are placed …

Gill rakers in fish are bony or cartilaginous processes that project from the branchial arch (gill arch) and are involved with suspension feeding tiny prey. They are not to be confused with the gill filaments that compose the fleshy part of the gill used for gas exchange. Rakers are usually present in two rows, projecting from both the anterior and posterior side of each gill arch.

Ampullae of Lorenzini are physically associated with and evolved from the mechanosensory lateral line organs of early vertebrates.Passive electroreception using ampullae is an ancestral trait in the vertebrates, meaning that it was present in their last common ancestor. Ampullae of Lorenzini are present in cartilaginous fishes (sharks, rays, and chimaeras), lungfishes, bichirs, …

Game fish, sport fish or quarry refer to popular fish pursued by recreational anglers, and can be freshwater or saltwater fish.Game fish can be eaten after being caught, or released after capture.Some game fish are also targeted commercially, particularly salmon and tuna.. Specimens of game fish whose measurements (body length and weight) are a lot above the …

Amphibious fish are fish that are able to leave water for extended periods of time. About 11 distantly related genera of fish are considered amphibious. This suggests that many fish genera independently evolved amphibious traits, a process known as convergent evolution.These fish use a range of terrestrial locomotory modes, such as lateral undulation, tripod-like walking …

Structure. A dorsal fin is classified as a medial, unpaired fin that is located on the midline of the backs of some aquatic vertebrates.In development of the embryo in teleost fish, the dorsal fin arises from sections of the skin that form a caudal fin fold. The larval development and formation of the skeleton that support the median fins in adults result in pterygiophores.