fishery resources survey

It is a basic work to investigate the reproduction, growth, death, migration, distribution, quantity, habitat, prospect and means of development and utilization of economic animals and plants in waters. Divided into two categories: management survey and development survey. The former is aimed at the developed fishing grounds, aiming at rational utilization of aquatic resources in order to obtain the maximum reasonable and sustainable yield. The latter is aimed at undeveloped waters, aiming at finding new fishing targets and corresponding development means. The information to be provided after investigation includes: ① the population composition of fish and other aquatic economic animals and plants in specific waters; ② Time and place of population distribution in waters; (3) the quantity or exploitation degree of fishery resources; ④ Appropriate development technologies and means; ⑤ Necessary mode of production and suggestions for rational development of production; ⑥ Opinions on recovery and rational utilization of over-developed resources, etc. The quality of fishery resources survey depends on a large number of marine survey data to provide the circulation and biological distribution range of the world's oceans. For example, the dense distribution of fish in continental shelf and high seas is often closely related to the intersection of different currents and the convergence area on the surface of upwelling basin. Fish in coastal waters and estuaries are also related to confluence and river runoff. Therefore, the analysis of marine hydrological data is an important aspect of fishery resources investigation.