渔业和畜牧业生产

抽象的

Pelagic Fish : Types and Uses

Ian Bricknell

Pelagic angle live within the pelagic zone of sea or lake waters being not one or the other near to the foot nor close the shore in differentiate with demersal angle that do live on or close the foot, and reef angle that are related with coral reefs. The marine pelagic environment is the biggest sea-going living space on Soil, possessing 1,370 million cubic kilometers (330 million cubic miles), and is the territory for 11% of known angle species. The seas have a cruel profundity of 4000 metres. About 98% of the whole water volume is underneath 100 meters (330 ft), and 75% is underneath 1,000 meters (3,300 ft). Marine pelagic angle can be separated into pelagic coastal angle and maritime pelagic fish. Coastal angle occupy the generally shallow and sunlit waters over the mainland rack, whereas maritime angle occupy the endless and profound waters past the mainland rack (indeed in spite of the fact that they too may swim inshore).

Pelagic angle run in measure from little coastal scavenge angle, such as herrings and sardines, to huge pinnacle predator maritime angles, such as bluefin fish and maritime sharks. They are more often than not dexterous swimmers with streamlined bodies, able of maintained cruising on long-distance movements. Numerous pelagic angle swim in schools weighing hundreds of tons. Others are single, such as the huge sea sunfish weighing more than 500 kilograms, which some of the time float inactively with sea streams, eating jelly fish.