Having tangle netted and seined fish I can say the risk are not fulling understood by most let alone the economic and social drivers. Gill nets are relatively inexpensive and allow the fishers ( particularly tribal members ) to maintain their independence. Seines are more costly to purchase / operate and require much more skill. From experience I can tell you that you make one mistake with a beach seine and you will kill a bunch. Seines can be a success or utter disaster just depends on the skill of the crew manning them as every step of the way your making decisions right or wrong and which are are the only two outcomes.

The only economical harvest method that can be made truly selective is a fish wheel. They would cost a bunch to build, site, and permit. Then this the cash investment would be huge with the total loss of independence to the fisher as it would be a co-op thing or a single individual with deep pockets.