In descending order of their proportion in the catch they were bigeye tuna (Thunnus obesus), longnose lancetfish (Alepisaurus ferox), blue shark (Prionace glauca), mahimahi (Coryphaena hippurus), sickle pomfret (Taractichthys steindachneri), snake mackerel (Gempylus serpens), skipjack tuna (Katsuwonus pelamis), albacore (Thunnus alalunga), yellowfin tuna (Thunnus albacares), striped marlin (Tetrapturus audax), escolar (Lepidocybium flavobrunneum), ono (Acanthocybium solandri), and shortbill spearfish (Tetrapturus angustirostris).
0 whereas escolar has a maximum size of 2 m and is slower growing than snake mackerel, and therefore it was assigned a P/B of 0.
Albacore tuna, bigeye tuna, blue shark, shortbill spearfish, and striped marlin all showed declining CPUE trends; skipjack tuna, yellowfin tuna, ono, and lancetfish showed no significant trends; and mahimahi, sickle pomfret, escolar, and snake mackerel showed increasing trends (Table 1, Figs.
The increasing trends for mahimahi, escolar, and snake mackerel are most likely not due to increased targeting because snake mackerel has no commercial value, escolar has limited commercial value, and mahimahi is not caught efficiently with deep-set gear (it is generally only caught when the gear is being recovered and hooks are at the surface).
However, as previously discussed, sickle pomfret, escolar, and snake mackerel, although not specifically identified in the Kitchell et al.
Our knowledge of the feeding ecology of many of the midtrophic level fishes that appear to have increased--sickle pomfret, escolar, and snake mackerel--is very limited and therefore we do not know the impacts on the ecosystem from their increased abundance.