JPS602129A - Purification of egg of iwamushi - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for purifying nymph eggs.

Nymphs belong to the annelid polychaete and are perfect as fishing bait for high-grade fish, and are also called the king of fishing baits.

Currently, the nymphs are commercially available by collecting them from their natural habitat. However, due to habitat destruction, pollution, and overfishing, the number of nymphs living in nature has been decreasing every two years. However, collecting them from their habitat limits the fertilization period, making it impossible to provide a stable supply throughout the year. For these reasons, two different methods of cultivating nymphs have been studied in recent years.

However, there are still many problems that need to be resolved in order to artificially manage the entire life cycle of nymphs, from spawning to formation to adulthood, and farming on an industrial scale has not yet been possible. . One of the problems is the method of purifying the collected eggs.

When cultivating nymphs, there are factors that differ from those in the natural world, such as mechanical pumping of seawater, artificial temperature control of seawater, and use of factory wastewater.
Small protozoa such as Halbactychus occur. Some of the small protozoa that emerge eat the eggs and larvae of nymphs, or inhibit the growth of larvae and nymphs. If the small protozoa are considerably smaller than the nymph eggs, they can be removed by filtration. Unfortunately, however, many of these small protozoa are either slightly smaller than nymph eggs or about the same size as eggs, and until now, the small protozoa have not been transferred to the nymph's salmon tank without being removed from the eggs. Therefore, the f# conversion rate was extremely low. In addition, when nymphs become sick or injured, they tend to spread the disease to other members, so ultimately the yield rate of shipping-sized adults is extremely low.

In view of this situation, the present inventors conducted extensive research with the aim of developing a method for removing small protozoa from collected nymph eggs. the result.

If you crush the collected nymph eggs in fresh water and filter it.

The present invention was completed by discovering that eggs can be easily contaminated with small protozoa.

That is, the present invention consists of crushing nymph eggs in which small protozoa coexist in fresh water, and then separating the small protozoa and nymph eggs. A method for purifying nymph eggs is provided.

The size of nymph eggs is usually about 200-250μ.

Therefore, if eggs contain small protozoa of the same size as the protozoa, it is physically impossible to separate the two. Also, in the case of small protozoa that are smaller than the thickness of an egg, the small protozoa will twitch and move through the holes in the hearth cloth.

Difficult to separate eggs from oven.

According to the present invention, by crushing nymph eggs containing small protozoa in fresh water, the small protozoa die or become suspended animation.

Not only protozoa that are smaller than nymph eggs, but also small protozoa that are about the same size as eggs can be separated from eggs, and purified nymph eggs can be obtained. In other words, small protozoa that are about the same size as nymph eggs can increase their body length significantly, making it easier to separate them from the eggs, and small protozoa that are smaller than nymph eggs are stationary, making them difficult to separate from the eggs. This makes it easier to pass through and move eggs from door to door.

In the present invention, eggs of nymphs containing small protozoa are crushed in fresh water for a time long enough to cause the small protozoa to die or become suspended, while if crushed in fresh water for a long time, the eggs themselves This results in death.

Taking these into consideration, the time is usually within 6 minutes, preferably about 10 seconds to 2 minutes for digging the trench.

Next, the dead or suspended small protozoa and nymph eggs are separated according to the size of the nymph eggs.
mesh (J engineering S standard, 420-297μ, the same applies hereafter).

) and 80-100 meshes (, TIS standard, 177-1
49μ, and so on. ) is carried out by using two types of furnace cloth together.

In other words, small protozoa that are about the same size as nymph eggs remain on the former furnace cloth, and small protozoa that are smaller than nymph eggs migrate to the F liquid side, so purified nymph eggs are The latter remains on the furnace cloth and can be collected.

The eggs laid by the parent nymph in the spawning tank are collected together with seawater. In addition to the eggs of the nymphs, the seawater also contains feed for the parent worms in the spawning tank, floating matter such as filth, and small protozoa. The present invention can be applied to purifying eggs from seawater containing such collected nymph eggs.

Next, two application examples will be given, but the present invention is not limited to these application examples. In addition, in the following application example, if you want to leave nymph eggs on the furnace cloth, take into consideration that floating objects and small protozoa that are smaller than eggs should be transferred to the filtration source side as much as possible. Hearth cloth is used. On the other hand, when it is desired to transfer the 2g port to the filtration source side, 35 to 48 g of furnace cloth is used, taking into consideration that floating objects larger than eggs and small protozoa remain on the furnace cloth as much as possible.

Application example 1 This application example is to collect floating objects and small protozoa that are larger than the eggs, or floating objects and small protozoans that are smaller than the eggs, in seawater containing collected nymph eggs.

This is particularly suitable when the situation is crowded.

The seawater containing the collected nymph eggs is filtered using a furnace cloth of 35 to 48 meshes. Due to this filtration operation, small protozoa larger than eggs and suspended matter remain on the furnace cloth9. Eggs, small protozoa that are equal to or smaller than eggs, and suspended matter pass through the oven cloth and migrate into the P' liquid.

The filtrate is then filtered using an 80-100 mesh furnace cloth. Through this filtration operation, eggs and small protozoa that are the same size or slightly smaller than eggs remain on the furnace cloth.

Small protozoa and floating objects that are much smaller than eggs pass through the P cloth and migrate into the tear fluid.

The eggs and small protozoa on the oven cloth are crushed in fresh water for a predetermined period of time, and then filtered using a combination of 65-48 mesh and 80-100 mesh oven cloth. Through this filtration operation, small protozoa that are about the same size as eggs remain on the former cloth, and small protozoa that are slightly smaller than eggs are transferred into the tear fluid, and purified nymphs are left on the latter cloth. eggs can survive.

Application example 2 This application example applies when the seawater containing the collected nymph eggs does not contain small protozoa or floating objects larger than the eggs, or even if the seawater containing the collected nymph eggs contains floating objects larger than the eggs. , they are nymph eggs and larvae.

It is particularly suitable for cases where it does not harm the larvae.

The seawater containing the eggs of the harvested nymphs is filtered using a furnace cloth of 80 to 100 mesh sizes. Through this filtration operation, floating matter smaller than eggs and small protozoa are transferred to the tear fluid side, and eggs and small protozoa that are the same size or slightly smaller than eggs remain on the cloth. The residue on the furnace cloth was removed from the above application example 1.
It is particularly suitable when the fresh water is treated in the same manner as above and then filtered, so that the sesame is in the same state as in Application Example 1 above.

The seawater containing the collected nymph eggs is filtered using a furnace cloth of 80 to 1007 mm. Through this filtration operation, floating matter smaller than eggs and small protozoa are transferred to the lachrymal fluid side, and eggs, small protozoa larger than eggs, and floating matter remain on the E cloth.

The residue on the furnace cloth is crushed in seawater, and then filtered using a furnace cloth of 55 to 48 mesosie. Through this filtration operation, small protozoa that are equivalent to or slightly smaller than rabbits and eggs migrate to the F source side, and small protozoa that are larger than eggs and suspended matter remain on the furnace cloth.

Next, the lachrymal fluid was filtered using a furnace cloth of 80 to 100 mesosies, and the eggs remaining on the furnace cloth and small protozoa that were equivalent to or slightly smaller than the eggs were treated with fresh water in the same manner as in Application Example 1. , purified eggs can be obtained by filtration.

The present invention can efficiently purify nymph eggs in this way, and plays a major role in improving the Il production rate and the yield rate of shipping-sized nymphs. That is, the present invention provides an opportunity to realize nymph cultivation on an industrial scale, and has extremely high industrial value.

Patent applicant: Ube Industries Co., Ltd. 10 pieces

Claims (1)

[Claims] The method is characterized by soaking nymph eggs containing small protozoa in fresh water, and then separating the small protozoa and nymph eggs from house to house. Method for purifying nymph eggs.