Pelagic longline gear had several independent evolutions, but the most widespread form appears to have been originally developed by Japanese as early mid-19 th century. Technological developments such polyamide monofilament line and modern fishing vessel construction resulted in evolution expansion of this type primary worldwide method commercially harvesting large pelagic fishes broadbill swordfish tunas. Although adaptability through changes materials, lengths, deployment strategies has...

ABSTRACT Researchers have applied numerous techniques to improve billfish stock assessments, including habitat‐based models that incorporate behavioral and oceanographic parameters standardize historical catch‐per‐unit‐effort time‐series data. These methods allowed researchers account for significant changes in the depths of pelagic longline (PLL) gear deployments over time. This study presents habitat‐use data recovered from high‐resolution 5‐ 10‐day pop‐up satellite archival tags (PSATs)...

Abstract We performed a quantitative review to evaluate circle hook use in recreational and commercial hook‐and‐line fisheries that interact with billfishes (Family: Istiophoridae). Specifically, we scrutinized the findings of 11 recent empirical studies reported, on species‐specific basis, side‐by‐side measures vs. J‐hook fishing performance: catch, mortality, deep‐hooking bleeding rates. Of 30 total comparisons extracted from literature satisfied our inclusion criteria, 13 indicated...

Abstract The biomass levels of several target species the Atlantic pelagic longline fishery, including various tunas genus Thunnus and swordfish Xiphias gladius, are estimated to be close those required support maximum sustainable yield. In contrast, captured incidentally severely depleted. Live release incidental catch is one means reducing fishing mortality these without sacrificing catch, but efficacy such a measure predicated on assumption that postrelease survival relatively high. Prior...

Abstract The vertical movement patterns of eight Swordfish Xiphias gladius from 109‐ to 249‐cm lower jaw fork length in the western North Atlantic were studied utilizing pop‐up archival transmitting tags. Deployments ranged 120 151 d. demonstrated significant differences depth and temperature distributions between daytime nighttime periods. Individual behavior was characterized by occupying surface waters less than 100 m during night depths greater 400 hours, movements occurring crepuscular...

The hawaii-based deep-set longline fleet targets bigeye tuna [Thunnus obesus (lowe, 1839)] and infrequently takes false killer whales [fkw,Pseudorca crassidens (owen, 1846)] as bycatch. from 2004 to 2008 with 20%-26% observer coverage, nine mortalities of serious injuries fkw were documented in the fishery hawaii eeZ, yielding a mean take estimate 7.3 animals yr-1. weak hook technology can utilize size disparity between target other species promote release larger non-target species. four...

Two of the main drivers speciation among aquatic vertebrates are physical isolation (e.g., lakes and streams) micro-niche availability tropical reefs). In both regards, mesopelagic domain open ocean, Earth’s second largest cumulative ecosystem (behind only bathypelagic domain), would seem retardant. Ocean circulation makes rare on contemporary geological time/space scales, lack substrate precludes stable micro-niches. Paradoxically, some pelagic taxa demonstrate much higher-than-expected...

Abstract Pop‐up satellite archival tags (PSATs) were deployed on 19 sailfish Istiophorus platypterus captured in the southern Gulf of Mexico and Florida Straits between 2005 2007 commercial pelagic longline gear ( n = 18) recreational rod‐and‐reel 1). The data from three indicated mortality events excluded subsequent analyses. All PSATs programmed to collect pressure (depth), temperature, light‐level for 10 d at approximately 90‐s intervals. These transmitted point subsequently allowed...

The most abundant fishes on Earth live in the meso- and bathypelagic (deep-pelagic, collectively) zones of open ocean, where they play a key role deep-sea food webs by mediating energy flow from surface waters to great depth. Of these fishes, speciose taxon is family Stomiidae (dragonfishes). Despite being numerically dominant predators global mesopelagic zone, stomiid reproductive ecology poorly known. Research surveys rarely catch larger adults, impeding studies. Between 2010-2011,...

An emerging body of literature has demonstrated the benefits use circle hooks relative to standard J-hooks in commercial and recreational fisheries.In pelagic longline fishery for tunas (Thunnus spp.) swordfish (Xiphias gladius Linnaeus, 1758), resulted greater catch rates some target species, lower bycatch a higher percentage many species alive at time haulback (gear retrieval).However, lack agreement among results studies conducted different fisheries areas, using baits rigging techniques,...

Background. Understanding the life history of a species is essential for fully understanding its role within an ecosystem. However, many fish high ecological value have not been studied due to their less prominent roles in local recreational and commercial fisheries comparison other targeted species. These valuable fishes are also important trophic linkages between small neritic large, economically apex predators. This study describes first time yearly age growth patterns three tuna...

In June 2003, fisheries research was conducted in the Windward Passage using a chartered commercial pelagic longline vessel (Rice and Snodgrass 2003). This paper describes habitat use by an escolar this location tagged with pop-up satellite archival tag (PSAT) that remained attached to fish for 14 d. Data recovered from PSAT were used directly document diel vertical migration ambient temperature range first time mesopelagic teleost.