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    Rights statement: This is an Accepted Manuscript of an article published by Taylor & Francis in African Journal of Marine Science on 15/11/2017, available online: http://www.tandfonline.com/10.2989/1814232X.2017.1364665

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Fishery benefits from exploiting spawning aggregations not solely dependent on enhanced fish density

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Published

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Fishery benefits from exploiting spawning aggregations not solely dependent on enhanced fish density. / Robinson, Jan; Graham, Nicholas Anthony James; Gruss, A et al.

In: African Journal of Marine Science, Vol. 39, No. 3, 2017, p. 269-278.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Harvard

Robinson, J, Graham, NAJ, Gruss, A, Gerry, C & Bijoux, J 2017, 'Fishery benefits from exploiting spawning aggregations not solely dependent on enhanced fish density', African Journal of Marine Science, vol. 39, no. 3, pp. 269-278. https://doi.org/10.2989/1814232X.2017.1364665

APA

Robinson, J., Graham, N. A. J., Gruss, A., Gerry, C., & Bijoux, J. (2017). Fishery benefits from exploiting spawning aggregations not solely dependent on enhanced fish density. African Journal of Marine Science, 39(3), 269-278. https://doi.org/10.2989/1814232X.2017.1364665

Vancouver

Robinson J, Graham NAJ, Gruss A, Gerry C, Bijoux J. Fishery benefits from exploiting spawning aggregations not solely dependent on enhanced fish density. African Journal of Marine Science. 2017;39(3):269-278. Epub 2017 Nov 15. doi: 10.2989/1814232X.2017.1364665

Author

Robinson, Jan ; Graham, Nicholas Anthony James ; Gruss, A et al. / Fishery benefits from exploiting spawning aggregations not solely dependent on enhanced fish density. In: African Journal of Marine Science. 2017 ; Vol. 39, No. 3. pp. 269-278.

Bibtex

@article{e7c80ec6d921457d9f223a0f783db6c1,
title = "Fishery benefits from exploiting spawning aggregations not solely dependent on enhanced fish density",
abstract = "The vulnerability of spawning aggregations to exploitation varies among fisheries as a result of differences in the population-density changes associated with this behaviour. However, vulnerability to fishing is also influenced by technology, environmental factors, and fish and fisher behaviours. Focusing on a fishery for the rabbitfish Siganus sutor at Praslin Island, Seychelles, we examined how catch rate varied across spawning and non-spawning habitats in relation to in situ population-density changes and other factors known to influence catchability. Catch rates in spawning habitat were disproportionate to density changes, being only fourfold greater than catch rates in non-spawning habitat, despite the fact that spawning-aggregation formation involved nine- to thirteen-fold increases in population density. Catch rates in spawning habitat were also highly variable across the spawning season (0–23.4 fish trap-hour−1). Current strength was of similar importance to density as a catch-rate predictor, with the highest catch rates in spawning habitats confined to months with the strongest currents. Therefore, in addition to density-dependent catchability, other factors that influence catch rates must be examined to avoid overestimation of the vulnerability of populations to aggregation fishing. The dynamics of catchability at spawning sites can limit the ability of fishers to predict and maximise returns based on increases in fish density.",
keywords = "catchability, catch rates, density dependence, fishing effects, reef fish, Seychelles, Siganidae, trap fishery, video survey ",
author = "Jan Robinson and Graham, {Nicholas Anthony James} and A Gruss and C Gerry and J Bijoux",
note = "This is an Accepted Manuscript of an article published by Taylor & Francis in African Journal of Marine Science on 15/11/2017, available online: http://www.tandfonline.com/10.2989/1814232X.2017.1364665",
year = "2017",
doi = "10.2989/1814232X.2017.1364665",
language = "English",
volume = "39",
pages = "269--278",
journal = "African Journal of Marine Science",
issn = "1814-232X",
publisher = "Taylor & Francis",
number = "3",

}

RIS

TY - JOUR

T1 - Fishery benefits from exploiting spawning aggregations not solely dependent on enhanced fish density

AU - Robinson, Jan

AU - Graham, Nicholas Anthony James

AU - Gruss, A

AU - Gerry, C

AU - Bijoux, J

N1 - This is an Accepted Manuscript of an article published by Taylor & Francis in African Journal of Marine Science on 15/11/2017, available online: http://www.tandfonline.com/10.2989/1814232X.2017.1364665

PY - 2017

Y1 - 2017

N2 - The vulnerability of spawning aggregations to exploitation varies among fisheries as a result of differences in the population-density changes associated with this behaviour. However, vulnerability to fishing is also influenced by technology, environmental factors, and fish and fisher behaviours. Focusing on a fishery for the rabbitfish Siganus sutor at Praslin Island, Seychelles, we examined how catch rate varied across spawning and non-spawning habitats in relation to in situ population-density changes and other factors known to influence catchability. Catch rates in spawning habitat were disproportionate to density changes, being only fourfold greater than catch rates in non-spawning habitat, despite the fact that spawning-aggregation formation involved nine- to thirteen-fold increases in population density. Catch rates in spawning habitat were also highly variable across the spawning season (0–23.4 fish trap-hour−1). Current strength was of similar importance to density as a catch-rate predictor, with the highest catch rates in spawning habitats confined to months with the strongest currents. Therefore, in addition to density-dependent catchability, other factors that influence catch rates must be examined to avoid overestimation of the vulnerability of populations to aggregation fishing. The dynamics of catchability at spawning sites can limit the ability of fishers to predict and maximise returns based on increases in fish density.

AB - The vulnerability of spawning aggregations to exploitation varies among fisheries as a result of differences in the population-density changes associated with this behaviour. However, vulnerability to fishing is also influenced by technology, environmental factors, and fish and fisher behaviours. Focusing on a fishery for the rabbitfish Siganus sutor at Praslin Island, Seychelles, we examined how catch rate varied across spawning and non-spawning habitats in relation to in situ population-density changes and other factors known to influence catchability. Catch rates in spawning habitat were disproportionate to density changes, being only fourfold greater than catch rates in non-spawning habitat, despite the fact that spawning-aggregation formation involved nine- to thirteen-fold increases in population density. Catch rates in spawning habitat were also highly variable across the spawning season (0–23.4 fish trap-hour−1). Current strength was of similar importance to density as a catch-rate predictor, with the highest catch rates in spawning habitats confined to months with the strongest currents. Therefore, in addition to density-dependent catchability, other factors that influence catch rates must be examined to avoid overestimation of the vulnerability of populations to aggregation fishing. The dynamics of catchability at spawning sites can limit the ability of fishers to predict and maximise returns based on increases in fish density.

KW - catchability

KW - catch rates

KW - density dependence

KW - fishing effects

KW - reef fish

KW - Seychelles

KW - Siganidae

KW - trap fishery

KW - video survey

U2 - 10.2989/1814232X.2017.1364665

DO - 10.2989/1814232X.2017.1364665

M3 - Journal article

VL - 39

SP - 269

EP - 278

JO - African Journal of Marine Science

JF - African Journal of Marine Science

SN - 1814-232X

IS - 3

ER -