Large type is threaten by the smaller one by Jana Passova

There was made the research in two artificial lakes in Canada. This study was supported by the University of Technology Sydney and the National Science and Engineering Research Council of Canada. The object was to find differences between two types of rainbow trout. Researchers tried to verify if their speculations were right. Researchers found out that large fishes may be replaced by smaller and timid varieties. This could be the result of a rule which allows to catch only large fishes and also that large and fast-growing type of trout is less careful and it is easer to catch it for fisher. The biggest surprise is how fast the replacement could happen. The first type is more aggressive when it is looking for food and it grows faster. The other one is more careful in seeking food and it grows longer time. Researchers tried to catch fishes five days. They moved their nets each day. They managed to catch 50 percent of aggressive ones but only 30 percent of more careful type. This happened because the fast-growing fishes are more active and not enough careful and they tend to bump into nets more often. On the other side, these fishes needs to eat much more because of their activity. There is visible the impact of mankind having on the sea. It is an indirect effect of fishing. The effects of rules were unconsidered till this time. People who are responsible for this should be able to see that the reproduction of fast-growing individuals is more important that they had recognized.

by Jana Passova for PocketNews (http://pocketnews.tv)

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