Stock structure of the world's istiophorid
billfishes: a genetic perspective.
nigricans, whereas only 13 or less variables are within the observed range of other extant istiophorids
Atlantic management area, commercial harvesting of istiophorid
billfish species has been prohibited since 1988.
Similar findings have been reported for istiophorid
billfish, which showed significantly lower at-vessel mortality (Diaz, 2008; Serafy et al.
Habitat preferences of istiophorid
billfishes in the western north Atlantic: applicability of archival tag data to habitat-based stock assessment methodologies.
nigricans, as well as some less diagnostic istiophorid
remains, in the middle facies of the Trinidad Formation (late Miocene to late Pliocene) in the San Jose del Cabo Basin, Baja California Sur, Mexico, offers the first opportunity to examine billfish specimens from fossil deposits located between southern California and Panama and to discuss the paleoecology of the Trinidad Formation based on the habitat preference of a still extant bony fish.
billfishes in the Atlantic Ocean experience considerable fishing pressure and most stocks are overfished.
larvae were photographed and standard length (SL) was measured to the nearest 0.
Recently, pop-up satellite archival tag (PSAT) technology has proven especially useful to study postrelease survival in several larger istiophorid
species, including blue marlin in the Atlantic (Graves et al.
A troubling aspect of current larval istiophorid
identification methods is the difficulty in using some of the above characters.
Neuston tows (n=23) yielded 18 istiophorid
larvae: eight were white marlin, four were blue marlin, and six could not be identified to species.
Little acoustic tracking has been conducted on white marlin (Skomal and Chase, 2002; n=2 tracks), but similar work on other istiophorid
species indicates relatively high postrelease survival for periods ranging from a few hours to a few days for fish released from recreational fisheries (e.
otoliths: extraction, morphology, and possible use as ageing structures.
Larvae undergo a stark change in physical appearance between ~8 and 13 mm preserved standard length (PSL), from a typical scombroid larval form to a juvenile istiophorid
one (Collette et al.
Assuming similar behavior among other istiophorid
species, this observation may explain the good to excellent condition noted for the blue marlin in our study even after extended soak times.