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Because of the free-floating nature of larvae and subsequent mixing of juvenile halibut from throughout the Gulf of Alaska, though, only one genetic stock of halibut is known in the North Pacific. Halibut growth rates vary depending on locations and habitat conditions, but females grow faster than males.
A fishery population is affected by three dynamic rate functions: Birth rate or recruitment. Recruitment means reaching a certain size or reproductive stage. With fisheries, recruitment usually refers to the age a fish can be caught and counted in nets. Growth rate. This measures the growth of individuals in size and length.
The halibut is among the largest teleost (bony) fish in the world, and is a threatened species owing to a slow rate of growth and overfishing. [3] [4] Halibut are strong swimmers and are able to migrate long distances. Halibut size is not age-specific, but rather tends to follow a cycle related to halibut (and therefore food) abundance.
Halibut yield large fillets from both sides of the fish, with the small round cheeks providing an additional source of meat. [26] Halibut are often boiled, deep-fried or grilled while fresh. Smoking is more difficult with halibut meat than it is with salmon, due to its ultra-low fat content.
Under the assumption of logistic growth, the MSY will be exactly at half the carrying capacity of a species, as this is the stage at when population growth is highest. The maximum sustainable yield is usually higher than the optimum sustainable yield. Studies have shown that fishing at the level of MSY is often not sustainable.
The relative increases in growth differ between species. [21] (Figure 1) [22] They range from a doubling in weight, to some fish that are almost 100 times heavier than the wild-type at a comparable age. [13] This research area has resulted in dramatic growth enhancement in several species, including salmon, [23] trout [24] and tilapia. [25]
In fisheries science and ecology, stock assessment is an important tool in fisheries management. In particular, to ensure continued, healthy, fish stocks, measurements of the Spawning Stock Biomass (the stock population capable of reproducing) allows sensible conservation strategies to be developed and maintained through the application of ...
Population ecology is a sub-field of ecology that deals with the dynamics of species populations and how these populations interact with the environment. [15] It is the study of how the population sizes of species living together in groups change over time and space, and was one of the first aspects of ecology to be studied and modelled mathematically.