Strength and uncertainties in the results of the TTT software, used to estimate statistics of purse seiners (catch and catch at size) and on the ways to improve these results

This 2018 meeting of the IOTC TT WG: 2 papers submitted on this question by Spanish
and French scientists on this complex question

These 2 papers contains are discussing various important questions, but they are often
quite weak and misleading in their presentation and conclusion

And as a result these 2 papers are providing conflicting results & conclusions, and
without a clear scientific analysis of the real characteristics and problems of the PS
statistics handled by the TTT software, and on the best ways to solve these present
problems

This short presentation will try to develop a simplified & clear scientific overview of the
strong qualities but clear potential problems of the past TTT results of the various
concerned fleets in the Indian Ocean,

It will also make various recommendations allowing to reduce the past and future
uncertainties and errors in the PS statistics handled by TTT