We focused primarily on catch rates of the target species, bigeye tuna, and on the primary bycatch species, longnose lancetfish. For our assessment of catch composition, we used the 21 most commonly caught species identified by Polovina and Woodworth-Jefcoats (2013).
Catch rates of longnose lancetfish, on the other hand, have increased over the past 2 decades, especially after 2004.
Quarterly catch rates of bigeye tuna and longnose lancetfish were considerably variable across the 4 regions of the fishery included in our analysis (Fig.
It may be typically absent in most large predatory fish stomach contents (literature reviewed by ), but a few individuals were eaten by dolphinfish, Coryphaena hippurus , bigeye tuna, Thunnus obesus , yellowfin tuna, Thunnus albacares , albacore, Thunnus alalunga , swordfish, Xiphias gladius [40, 78], and lancetfish [40, 41].
Cherel et al., "Forage fauna in the diet of three large pelagic fishes (lancetfish, swordfish and yellowfin tuna) in the western equatorial Indian Ocean," Fisheries Research, vol.
Apart from high mortality at haulback for many shark species (Coelho et al., 2012b), we also found high mortality rates at haulback with the use of nylon monofilament and wire leaders for commonly discarded species such as the longnose lancetfish (60% and 61%), and the snake mackerel (88% and 81%, respectively),
Food and Agriculture Organization of the United Nations species codes are used: SWO=swordfish (Xiphias gladius); DOL=dolphinfish (Coryphaena hippurus); BSH=blue shark (Prionace glauca); GES=snake mackerel (Gempylus serpens); ALX=longnose lancetfish (Alepisaurus ferox); and LEC=escolar (Lepidocybium flavobrunneum).
For the three species not fully reported in the logbooks (lancetfish, snake mackerel, and escolar), we used observer catch and effort data which covered about 16% of the fishing effort over the decade.
However, longnose lancetfish is assigned atrophic level of 3.2 and a P/B ratio of 0.3 in the model.
Indeed, it was found to be the main cephalopod prey in all the fishes, except in bigeye tuna and lancetfish where it ranked second and third, respectively.
Squids eaten by lancetfish and tunas in the tropical Indo-Pacific Ocean.
This was the case for all models, except for several models of albacore and long-nosed lancetfish. Therefore the following discussion concentrates on the effects of soak time and timing on catch rates.
the coefficient for short-nosed lancetfish was 0.09 (CI [+ or -] 0.05) in the Western Pacific distant fishery compared to 0.01 (CI [+ or -] 0.94) in the Western Pacific bigeye tuna fishery.
In 1987 we found a juvenile yellowfin tuna, Thunnus albacares (Bonnaterre, 1788), in the stomach of a longnose lancetfish, Alepisaurus ferox Lowe, 1833.
1) in good condition was found in the stomach of a lancetfish caught by pelagic longline on 17 May 1987 during a research cruise in the waters of the exclusive economic zone of Mauritius, western Indian Ocean.