| Autor: |
Schmassmann, W., Schmassmann, H. |
| Zdroj: |
Aquatic Sciences; Mar1949, Vol. 11 Issue 1/2, p277-288, 12p |
| Abstrakt: |
Researches have been made on 141 river-trouts of the Rhine to find out some connection between length, size, weight, age and sexual maturity. Immature fish were only found among those whose bodies (without the tail-fin) were shorter than 25,5 cm (the full length being about 29 cm). Large specimens of fish show only a rather slight increase of weight. Only the females up to a length of 30 cm and only the males up to about 31 cm give a favourable utilization of the food. For the economical management of the trout-stock in the Rhine the width of net-meshes of 34 mm and the lowest length of catchable trouts of 28 cm, as appointed by law, seems to be effective and favourable. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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