Measuring efficiency and predicting optimal set durations of pots for blue cod Parapercis colias

Cole, Russell; Alcock, N.K; Tovey, Anna; Handley, Sean J.

doi:10.1016/j.fishres.2003.09.039

Cited by 17 publications

(10 citation statements)

References 19 publications

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“…Catches of Tomtate, Stenotomus spp., and Sand Perch declined with increasing soak times, indicating that at least some individuals of these 3 species may have escaped from the trap. These results are consistent with our own observations and a growing body of literature that indicates that some fi sh, crab, and lobster species frequently escape from traps and pots (Jury et al, 2001;Cole et al, 2004;Sturdivant and Clark, 2011). Tomtate, Stenotomus spp., and Sand Perch were among the 3 smallest fi sh species examined in our study, and their small size may have allowed them to escape through the narrow trap entrance more easily than could species of larger size.…”

Section: Figuresupporting

confidence: 92%

“…(Goldman 3 ), but the 2 explanations are not mutually exclusive. Experimental work should be conducted with underwater video to quantify entry and exit rates of reef fi shes in fi sh traps-research that can provide signifi cant insights into the catch dynamics and species interactions of marine organisms (e.g., Jury et al, 2001;Cole et al, 2004;Sturdivant and Clark, 2011).…”

Section: Figurementioning

confidence: 99%

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Influence of soak time and fish accumulation on catches of reef fishes in a multispecies trap survey

Bacheler¹,

Bartolino²,

Reichert³

2013

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Abstract-Catch rates from fisheryindependent surveys often are assumed to vary in proportion to the actual abundance of a population, but this approach assumes that the catchability coefficient (q) is constant. When fish accumulate in a gear, the rate at which the gear catches fish can decline, and, as a result, catch asymptotes and q declines with longer fishing times. We used data from long-term trap surveys in the southeastern U.S. Atlantic to determine whether traps saturated for 8 reef fish species because of the amount of time traps soaked or the level of fish accumulation (the total number of individuals of all fish species caught in a trap). We used a deltageneralized-additive model to relate the catch of each species to a variety of predictor variables to determine how catch was influenced by soak time and fish accumulation after accounting for variability in catch due to the other predictor variables in the model. We found evidence of trap saturation for all 8 reef fish species examined. Traps became saturated for most species across the range of soak times examined, but trap saturation occurred for 3 fish species because of fish accumulation levels in the trap. Our results indicate that, to infer relative abundance levels from catch data, future studies should standardize catch or catch rates with nonlinear regression models that incorporate soak time, fish accumulation, and any other predictor variable that may ultimately influence catch. Determination of the exact mechanisms that cause trap saturation is a critical need for accurate stock assessment, and our results indicate that these mechanisms may vary considerably among species.

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Section: Figuresupporting

confidence: 92%

Section: Figurementioning

confidence: 99%

Influence of soak time and fish accumulation on catches of reef fishes in a multispecies trap survey

Bacheler¹,

Bartolino²,

Reichert³

2013

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“…While an acoustic shadow was produced by fish and some of the fish pot and frame structures fish could be observed inside the pot and at both tunnels until the numbers of fish surrounding the gear obscured the camera view. Multiple cameras have occasionally been used to observe multiple tunnels in fish pots (e.g., Cole et al, 2004), but this increases equipment expense and video processing time, and the field of view around the fishing gear is not captured. (5) The overhead projection for the field of view along with digital format allows for easy digitization of fish pathways and fish can be measured.…”

Section: Utility Of the Acoustic Cameramentioning

confidence: 99%

Use of high-frequency imaging sonar to observe fish behaviour near baited fishing gears

2005

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“…The catch of fish traps left at sea or lost has generally been considered insignificant due to high rates of ingress and egress (escapement) of fish from traps (e.g., Luckhurst and Ward, 1987;Whitelaw et al, 1991;Cole et al, 2004;Newman et al, 2009;Harvey et al, unpublished data). Observed catches of fish from traps left at sea between fishing trips in the NDSF have been substantial; e.g., the catch from traps dumped for six days prior to a fishing trip comprised 7% of the landed catch from the normal commercial fishing operations of that nine-day fishing trip (estimated from the statutory logsheets from the fishery).…”

Section: Introductionmentioning

confidence: 99%

Assessment of the Potential Impacts of Trap Usage and Ghost Fishing on the Northern Demersal Scalefish Fishery

Newman

Skepper

Mitsopoulos

et al. 2011

Reviews in Fisheries Science

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Fish traps are the principal fishing gear used in the Northern Demersal Scalefish Fishery. These fish traps are left at sea (dumped) between trips and are occasionally lost. The present study quantified the number of fish caught by baited fish traps set on the seabed and left to fish over the short (∼ 3 hr, within a trip) to medium term (12 days, between trips). Traps continued to retain fish for the duration of the experiment, despite the fact that all bait was exhausted within 3 hr. The catch rate of the traps was not significantly different for a range of teleost species and species groups over the 12-day duration of the experiment, with some exceptions. Catches after the 12-day soak time were similar to those soak times of only a few hours for most species and species groups. Importantly, despite the ability of fish to enter and exit traps, traps set for several days continue to catch fish. Fisheries monitoring and management implications primarily include errors in catch rate estimates from unaccounted fishing effort (soak time) from dumped traps and/or secondarily unaccounted mortality from lost fishing gear, both of which result in increased uncertainty in stock assessments.

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Measuring efficiency and predicting optimal set durations of pots for blue cod Parapercis colias

Cited by 17 publications

References 19 publications

Influence of soak time and fish accumulation on catches of reef fishes in a multispecies trap survey

Influence of soak time and fish accumulation on catches of reef fishes in a multispecies trap survey

Use of high-frequency imaging sonar to observe fish behaviour near baited fishing gears

Assessment of the Potential Impacts of Trap Usage and Ghost Fishing on the Northern Demersal Scalefish Fishery

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