Device for cladocera living body classification and classification method

Abstract

The invention discloses a device for cladocera living body classification. The device comprises a cylindrical shell (1) and is characterized in that an inner barrel (2) coaxial with the shell (1) is arranged in the shell (1); a motor (3) is arranged in the inner barrel (2); a rotary support (5) is connected to the top end of a work shaft (4) of the motor (3) and is composed of three rotary arms (6) evenly distributed on the circumference; a thick separation plate (7), a middle separation plate (8) and a thin separation plate (9) which are evenly provided with a plurality of holes are connected to the lower portions of the three rotary arms (6) correspondingly, and the width of all the separation plates is equal to the difference value of the radius between the shell (1) and the inner barrel (2); the diameter of the holes in the thick separation plate (7) is larger than the diameter of the holes in the middle separation plate (8); and the diameter of the holes in the middle separation plate (8) is larger than the diameter of the holes in the thin separation plate (9).

Description

technical field [0001] The invention relates to a living body grading device, in particular to a device for grading Cladocera living bodies, and a method for grading with the device. Background technique [0002] Cladocera, also known as daphnia, belong to invertebrates, crustacea, branchiopoda, cladocera. Ubiquitous in fresh water or sea water, it is live bait for small fry. Under the strategic background of "Blue Granary", in order to better cultivate high-quality fry, it is very important to classify live bait for fry. Not only can the purpose of saving resources be achieved, but also the living environment of fry can be improved. [0003] The current problem is that when feeding small fry, because there is no method or device that can classify daphnia according to body size, it is impossible to classify daphnia in vivo, and daphnia that are mixed in size are thrown to newborn small fish When used as bait, relatively large daphnia are often unable to be eaten by the yo...

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Problems solved by technology

[0003] The current problem is that when feeding small fry, because there is no method or device that can classify daphnia according to body size, it is impossible to classify daphnia in vivo, and daphnia that are mixed in size are thrown to newborn small fish When used as bait, relatively large daphnia are often unable to be eaten by the young fry and survive. These daphnia will consume a large amount of oxygen in the water while growing up, making the water quality poor and not suitable for small fry. Survive

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