In-vitro mark for fish and mark gun thereof

Abstract

The invention discloses an in-vitro mark for fish and a mark gun of the in-vitro mark. The mark comprises a U-shaped body made of plastic material; a pin is arranged at the inner side of one end of the U-shaped body, and a pin hole corresponding to the pin is arranged at the other end. The mark gun utilizes the mark; the pin on the mark can pass through fin rays on the fish body and is fixed in the pin hole on the U-shaped body to form an annular mark, which is firmly fixed on the base part of each fin ray just as a ring, and an opening of membrane between the fin rays is not increased so as to solve the problem that the mark easily falls off. Only the fin rays are marked; muscle of the fish body is not damaged; the fish death can be reduced, and the survival rate of the discharged fish can be ensured. Meanwhile, the quantity of the marks is large, so that a method for marking by the mark gun is fast; the marking time can be reduced, and the work efficiency can be improved.

Description

technical field [0001] The invention belongs to an animal identification mark, in particular to a mark used outside the body of fish and a mark gun thereof. Background technique [0002] The use of in vitro marked release of fish is an effective method for evaluating the effect of fish proliferation and releasing and estimating the amount of fish resources in water bodies. The method of marking is to put the external mark of the fish into the inter-ray membrane or muscle of the fish before release, and then keep the fish in the pond for a month. If the mark does not fall off, then put the marked fish into the river ; After release, flyers are distributed to fishermen, informing fishermen that if they catch fish with marks, they are asked to make a simple record, and then keep the marks, and the researchers will recycle them at a certain price. [0003] At present, the markers used for marking and releasing fish in vitro are mainly "T"-shaped markers, which are made of plast...

AI Technical Summary

Problems solved by technology

However, when the fin ray mark is used, because the inter-fin ray film is very thin, the opening caused when the mark is inserted is relatively large. In addition, the mark is perpendicular to the fin ray and the swimming direction of the fish. The resistance is high, and the inter-fin ray membrane is easy to be torn off, causing the marking to fall off; and when muscle marking is used, the pinhole in front of the marking gun penetrates into the muscle, causing injury to the fish body, and after the fish body is marked, the body The rejection reaction of the wound will fester at the wound site, and the mark will be excreted from the body during the swimming process; moreover, the hole of the "T" type marking gun is very small, and the mark is punched out by the thrust of a small steel wire. It is easy to be blocked, and it is more troublesome to unblock it, which delays the marking time

[0004] Therefore, the biggest problem of the existing marking method is: due to the fact that the mark cannot be tightly fixed on the fish body, and the ecological environment of the natural water body, the complex flow state of the water body, etc., the mark is easy to fall off from the fish body, which also leads to the recovery of the mark One of the main reasons for the low rate

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