Exposure device for fish embryos and larva fish for long-term chronic toxicity tests

Abstract

The invention discloses an exposure device for fish embryos and larva fish for long-term chronic toxicity tests. The exposure device comprises a tank and a tank cover which are arranged externally. The tank cover is provided with a plurality of small container ports. A small container is hung on each small container port so as to be allowed to extend into the inner space of the tank. The bottom of each small container keeps a certain distance from the bottom of the tank. An overflow pipe is arranged in each small container. Each overflow pipe penetrates out of the bottom wall of each small container and the bottom wall of the tank to be connected to a water inlet of a three-way valve. The other water inlet of each three-way valve is connected with a drain pipe, and each drain pipe penetrates out of the bottom wall of the tank and extends into the bottom of the tank. A water outlet of each three-way valve is connected with a protruding drain outlet, and the highest position of each protruding drain outlet is at the same level with an overflow pipe nozzle at the utmost top of each overflow pipe. The tank cover is further provided with a plurality of operating openings, and the lower periphery wall of each small container is provided with a narrow slit capable of leaking water and blocking the fish embryos and the larva fish from passing by.

Description

technical field [0001] The invention belongs to the field of flow-type toxicity detection, and in particular relates to an exposure device for embryos and larvae in long-term chronic toxicity tests of fish. Background technique: [0002] The ecotoxicological evaluation of chemicals and the toxicity of industrial discharges to the water environment are issues that have received attention in today's environmental protection work. So far, only biological toxicity tests can provide the toxicity information of pollutants. OECD, EEC, ISO, ASTM, etc. have established ecotoxicology test specifications and standards, and have continuously updated them. my country's environmental protection departments are also constantly formulating and updating new test standards. Now, more detailed standardization of toxicity tests is imminent. [0003] Most fish are sensitive to chemical substances. Compared with other aquatic organisms, the fish toxicity test method is simple and the test results...

AI Technical Summary

Problems solved by technology

In long-term toxicity test, as the test time is extended, the possibility of test failure increases, mainly in the low survival rate of embryos and larvae, and the quality control of the test standard cannot be reached at the end of the test

At present, although there are many domestic and foreign standards that can be referred to, there are no detailed methods for the key technologies in the standards, and these methods need to be developed by environmental protection workers

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