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About Lamprey Fish : Lampreys at times are also called lamprey eels. They are jawless fish, whose adults are categorized by their tooth and funnel-like sucking mouth. Lampreys are well-known species, which irk into the flesh of other fish to suck their blood. Most types of lamprey are non-parasitic and never prey on other fish. In zoology, lampreys are at times not regarded to be true fish because of their unique morphology and functioning

Physical Features : Adults physically look like eels, in that they have no scales, and can range anywhere from 15 to 120 centimeters long. Adult lampreys have big eyes, one nostril on the top of the head, and seven gill pores on every side of the head. However, they lack paired fins. The exceptional morphological characteristics of lampreys, such as their cartilaginous skeleton, imply that they are the sister taxon of all existing jawed vertebrates and are generally measured the most basal group of the Vertebrata. They feed as adults by attaching their mouth to the aim sea animals body, then by means of their teeth to cut through surface tissues until they reach body fluid. They will usually not attack humans unless they are hungry.

Sea Lamprey : The sea lamprey is scientifically known as Petromyzon marinus. It is a bloodsucking lamprey found on the Atlantic coasts of Europe and in the western Mediterranean Sea. It is brown or gray on its back and white or gray on the underneath and can grow to be up to 95 cm long. Sea lampreys prey on an ample variety of fish. The lamprey uses its suction-cup like mouth and attach itself to the skin of a fish and rasps away tissue. Secretions in the lamprey's mouth stop the victim's blood from clotting. Victims naturally die from extreme blood loss or infection.

Life cycle : The life cycle of sea lampreys is anadromous, similar to that of salmon. The juvenile are born in inland rivers, exist in the ocean as adults, and return to the rivers to rise. Juvenile appear from the egg as larvae, and toothless, and live that way for 3 to 8 years, hidden in mud and filter-feeding. Once they have matured to a definite length, they metamorphize into their parasitic type, after which they travel to the sea. Parasitic lampreys nourish on the tissue and blood of teleost fish. After a number of years they become sexually established and end feeding. Sexually mature lampreys come back to freshwater rivers and streams and generate, after which they die.

Breeding : Over 98% of all known fish are oviparous that is, the eggs grow outside the mother's body. Examples of oviparous fish include goldfish, tuna, and eels. The male and female fish shed their gametes into the nearby water. On the other hand, a few oviparous fish perform internal fertilization, with the male using some sort of intromittent organ to distribute sperm into the genital opening of the female, most remarkably the oviparous sharks, such as the horn shark. In these cases, the male is ready with a pair of adapted pelvic fins known as claspers.