May

21

 The fish are getting smarter. The fishermen may need new methods or find a new "fishin hole". Perhaps there is something to be said for direct counting in light of behavioral change.

Reports on the dramatic decline of fish populations in the ocean which were only based on fishery-dependent data, for example data from the long-line fishery of tuna, cod or swordfish, could also have their cause in enhanced gear-avoidance behaviour of those fishes. We have to rethink our monitoring of fish stocks and take the behavioural changes into account. Maybe some areas with high fishing intensity host more fish than we believe," concludes study leader Robert Arlinghaus.


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