The main species responsible for the difference in assemblage structure between the SACW and the combination of CW and M (CW+M)--the species that cumulatively accounted for ~75% of the difference--were the Argentine anchoita, Atlantic cutlassfish, rough scad, piquitinga anchovy, and white snake mackerel
(Thyrsitops lepidopoides), all of which were most abundant in SACW, and the Brazilian sardinella, flying gurnard, false pilchard (Harengula clupeola), American coastal pellona, and Atlantic thread herring (Ophistonema oglinum), all of which were most abundant in CW+M (Table 6).
Length-length and length-weight relationships of oilfish (Ruvettus pretiosus), escolar (Lepidocybium flavobrunneum), snake mackerel
(Gempylus serpens), and longnose lancetfish (Alepisaurus ferox) from the Gulf of Mexico and the western North Atlantic Ocean, Journal of Applied Ichthyology 30: 241-243, 2014.
But the buttery fish is actually a kind of snake mackerel
, a deep-sea bottom-feeder full of a wax ester that accounts for its dreamy velvety texture.
94 percent of the "white tuna" was not tuna at all, but escolar, a snake mackerel
that has a toxin with purgative effects for people who eat more than a small amount of the fish.
Catch rates for apex predators such as blue shark (Prionace glauca), bigeye (Thunnus obesus) and albacore (Thunnus alalunga) tunas, shortbill spearfish (Tetrapturus angustirostris), and striped marlin (Tetrapturus audax) declined by 3% to 9% per year and catch rates for four midtrophic species, mahimahi (Coryphaena hippurus), sickle pomfret (Taractichthys steindachneri), escolar (Lepidocybium flavobrunneum), and snake mackerel
(Gempylus serpens), increased by 6% to 18% per year.