There are at least two distinct populations of harbor porpoises in Southeast Alaska, and one of them appears to be particularly vulnerable to deaths from entanglements in commercial fishing gear, according to NOAA scientists. (From AlaskaBeacon)
on population size, is bycatch: the accidental drownings of porpoises tangled in fishing nets.
The study by Zerbini and his colleagues, published in the journal Frontiers in Marine Science, quantified population estimates and “potential biological removal,” or the levels of bycatch deaths that each group could withstand. That came out to losses of 12 animals a year for the northern population and 6.1 animals a year for the southern population.
However, documented reports could miss actual cases. The gillnet harvests are not monitored through any mandatory observer program. A pilot program conducted by NOAA in 2012 and 2013, theIt’s possible that fishing crews do not even see dead porpoises caught in nets, Zerbini said.
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