Soilless Nereid larva breeding method

Abstract

The invention relates to a soilless Nereid larva breeding method. According to the method, with 27-29 DEG C of water temperature, 7.8-8.6 of pH and 28-30 of salinity, larva breeding water undergoes dark precipitation and secondary sand filtration and is then filtered for further use by a 300-mesh bolting-silk bag; large and vigorous heteronereis bodies with no exterior wounds are selected and positioned in a plastic bucket containing 0.5 m3 of sea water for oviposition and insemination according to a proportion of 3:1 between the female and the male heteronereis bodies; oosperms undergo three times of egg washing and then are moved into a larva breeding pond; larva in a roaming period are mainly fed with chlamydomonas together with a certain amount of artificially mixed feed; when the larva grow into five-setiger nectochaeta larva, gracilaria is put in the pond as an attachment substrate, and a small amount of fish paste is also fed; and during the Nereid larva breeding, according to larva growing periods, the light illumination is controlled in a range of 300-1000 Lux. When the gracilaria is used for replacing silt as the Nereid perching place, as the gracilaria can utilize the metabolic products of the Nereids as the nutrients to promote self growth and is easily cleaned, the living environment of the larva can be bettered, the diseases and the damage to the larva during larva generation can be reduced, and the survival rate of the larva can be improved.

Description

technical field [0001] The invention belongs to the technical fields of agriculture, forestry, animal husbandry and fishery, in particular to a soilless seedling raising method for lugworm. Background technique [0002] The clamworm (Perinereis aibuhitensis Gnlbe) belongs to the phylum Annelida, Polychaeta, Nereidida, Neteididae, Neteidinae, rich in protein and eicosapentaenoic acid , the economic value is extremely high. Its fat body is large, and it is a superior bait, known as "universal bait", and it is also a good variety for export and earning foreign exchange, about 10,000 US dollars per ton; secondly, it is a high-quality fresh bait for fish, shrimps and crabs, etc., or As an additive and attractant for aquatic bait, it can save bait in shrimp ponds, clarify water quality, and reduce shrimp diseases; at the same time, it inhabits estuaries, and its larvae and adults can be used as good biological indicators for detecting water pollution. There are abundant tidal fl...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is in order to overcome the deficiency that above-mentioned prior art exists, according to nereis larvae need certain object as this life habit and characteristic of its attachment base when metamorphosis, and consider traditional sand grain attachment base cleaning difficulty and easy The shortcomings of causing disease and easy damage to larvae during emergence provide a method for soilless seedling cultivation of clamworm