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Juvenile fish are marketed as food. Whitebait is a marketing term for the fry of fish, typically between 25 and 50 millimetres long. Such juvenile fish often travel together in schools along the coast, and move into estuaries and sometimes up rivers where they can be easily caught with fine meshed fishing nets.
Whereas FishBase is a database about adult finfish, LarvalBase is a database about the juvenile stages of fish. Juvenile fish often feed differently and occupy different habitats than the adults do. LarvalBase complements FishBase by providing information about these early stages of life.
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Juvenile survival is dependent on very high quality water conditions. [7] [10] Feeding is an important component of the rearing process. Although many species are able to grow on maternal reserves alone (lecithotrophy), most commercially produced species require feeding to optimise survival, growth, yield and juvenile quality.
The adult fish are solitary but the juvenile fish are sociable and occur in shoals. The larvae and juveniles prefer rather shallow habitats along shorelines and these smaller fish have a varied diet of aquatic and terrestrial animals [ 6 ] while the large, solitary adults prey mainly on freshwater shrimp and small fishes.
The larvae begin to increase in size and develop into a juvenile fish once external feeding begins. In those fish with a leptocephalus stage; however, after hatching and obtaining nutrients from the yolk, the larvae do not begin external feeding. This is peculiar because the larvae still continue to grow in size.
Marine larval ecology is the study of the factors influencing dispersing larvae, which many marine invertebrates and fishes have. Marine animals with a larva typically release many larvae into the water column, where the larvae develop before metamorphosing into adults.
Onshore coral reefs have a greater proportion of older juvenile fish, suggesting that the mortality and/or emigration of adults is more common onshore. [8] Stoplight parrotfishes on offshore coral reefs have a greater average standard length, greater mean asymptotic size, and live twice as long as other fish from onshore coral reefs.