The shrimp fishery is the only one which destroys great numbers 

 of plaice of the and I groupo From the above it appears that as 

 long as this destroying does not take extraordinary dimensions, it is 

 not necessary for the promotion of the plaice fishery to take measures 

 against the shrimp fisheryo The real fishery for trash plaice was 

 after fish of more than two years oldj, and this cannot be defended 

 with the argument that by increasing density the speed of growth is 

 loweredo 



Measures to forbid the landing of undersized fish and to limit 

 their catching have been taken in Great Britain and in Germany since 

 1933« Denmark has had a minimum size for plaice of 26 centimeters 

 for even a longer period© 



39 Summary of Methods fo r the Protect ion of Undersized Fish 



Theoretically a decrease in the destruction of undersized fish 

 could be accomplished in two different ways j 



lo By preventing the catch of small fish© 



2o By throwing the small fish back overboard© 



ao Regulations Suggested to Prevent the Catching of Undersized Fish 



Several methods have been tried to prevent the destruction of 

 undersized fishr 



aao Enlarging the mesh width of the net© 

 bbo Special devices on the net to promote 



the escape of undersized fisho 

 cco Special fishing methods whereby fewer 



undersized fish are caught© 

 ddo The closing of grounds where many 



undersized fish are present© 



A short summary will be given here to show the extent to which 

 these methods have been able to attain the desired goal© 



lafto Enlarging the Mesh Width 



This is rational only when it appears that more undersized fish 

 escape by using larger meshes© This has been denied often (Beauge, 

 1934) 5 it was said that during the towing the meshes were pulled to- 

 gether so that nothing could escape© It iSj, therefore^ necessary to 

 show what tests have proven about the possibilities of escape through 

 the meshes of the net© 



