Collection method of live Antarctic krill samples

Abstract

The invention discloses a Euphausia superba living sample collection method and relates to Euphausia superba living sample collection. The technical scheme disclosed by the invention comprises Euphausia superba group searching, sampling time, sampling tools, a collection method and operating processes. The method is characterized in that a scientific fish finder ek500 is used to search Euphausia superba groups in horizontal and vertical directions; the sampling time is 21:00 of every day to 01:00 of the next day from December of every year to February of the next year; collection netting gears are special Euphausia superba living sampling lift nets; the collection method is floating ball suspension off-ship sampling and mobile radio buoys are used for positioning; during the operating processes, the net lowering depth is controlled to be 5-10m below the surface of water and the net lifting speed is controlled below 0.1m / s.

Description

technical field [0001] The invention relates to the living collection of Antarctic krill. Background technique [0002] Antarctic krill has increasingly attracted the attention of international fisheries due to its rich resources, and has become a hot spot of related research. Due to the special living environment of Antarctic krill, it is very difficult to obtain live krill samples. Sampling methods are the key link that restricts the acquisition of live krill samples. One, the current live Antarctic krill sampling method is daytime trawling. Due to the impact of water flow and the extrusion of mesh sacs during the trawling process, krill are seriously injured and the survival rate of samples is low. The distribution of krill in the water layer during the day is At 50-100 meters underwater, the short-term change in the distribution of the water layer causes a huge pressure difference and increases the probability of sample death. In addition, the temperature in Antarctica i...

AI Technical Summary

Problems solved by technology

[0002] Antarctic krill has increasingly attracted the attention of international fisheries due to its rich resources, and has become a hot spot of related research. Due to the special living environment of Antarctic krill, it is very difficult to obtain live krill samples. Sampling methods are the key link that restricts the acquisition of live krill samples. One, the current live Antarctic krill sampling method is daytime trawling. Due to the impact of water flow and the extrusion of mesh sacs during the trawling process, krill are seriously injured and the survival rate of samples is low. The distribution of krill in the water layer during the day is At 50-100 meters underwater, the short-term change in the distribution of the water layer causes a huge pressure difference and increases the probability of sample death; in addition, the temperature in Antarctica is low at night, and the trawling net leaves the water surface, and the sample freezes rapidly, which further reduces the survival rate of the sample

Therefore need a kind of sampling method that improves the survival rate of krill sample, but do not see relevant report so far