Hi Claudio,

For gill nets, you can express the number of individuals and or the weight by the length of the gill net and the number of sets and or the number of times the net was cleared. For traps/pots, you will need to know the number of pots and the number of lifts/checks, and if possible, their spatial coverage. You can achieve your objective by comparing the number and or weight of fish caught/hour/space. You have to note the limitations and the make assumptions with regard to differences in fishing areas for the two gears. Good luck.

Dear Seth, thank you very much for your interesting answer. We will try that approach also.

Thank you again

Dear Elsayed, thank you for the answer. Unfortunatelly I do not understand what do you mean with "check the correlation proportional structure density to calculate CPUE". Between what I have to do a correlation? Do you have any example to show me?

Thank you very much

Dear colleague, questions to compare CPUE and the best way is with the same arts in different locations or climatic times, However when you use other arts or different methods of collection the comparison is ovio that will come out different. But if you want to know the results according to your capture, first of all you have to standardize and in this way it will allow you to compare such CPUE in time and space.

So Jesús Rodríguez Romero, you are basically saying that to compare different fishing gears it is necessary to calculate CPUEs for each gear only and then compare them, isn't it? And this the same idea I had. But how can I say which is the number of traps comparable to some meters of gill net? I mean, I would like to change gill nets (because they bycatch too much turtles, dolphins etc) with traps, less dangerous for protected megafauna, but how can I say to fishermen, change 2 km of net with...I don't know, for example 200 traps? On which basis those 200 traps will catch a comparable amount of fish?

Thank you for your comment.

Dear colleague , all fishing gear in one way or another affects the ecosystem, and networks depending on the light of maya are less or more. The nets are very destructible and more when they operate on hard or reef substrates as I have observed, you also trap both juveniles and adults and here the problem becomes greater. The advantage of traps is that you can capture different sizes, but we can select which ones are acceptable for consumption and you can regularize your capture. if they catch trapped species they are released and so we are conserving the environment and as I wrote in my work fishing based on knowledge will return to the longer term according to the perspectives of each nation, that is, we should think about conservation and management. From my part I understood you for studies, to compare gill net capture with traps you must first standardize and then correlate and much more results will come out of all this, nice greetings.