Shark longline fishery of Papua New Guinea: size and species composition and spatial variation of the catches
William T. White A E , Leontine Baje B C , Sharon A. Appleyard A , Andrew Chin C , Jonathan J. Smart D and Colin A. Simpfendorfer C
+ Author Affiliations
- Author Affiliations
A CSIRO Marine Laboratories, Australian National Fish Collection, Castray Esplanade, Hobart, Tas. 7001, Australia.
B National Fisheries Authority, The Tower, Douglas Street, PO Box 2016, Port Moresby, National Capital District, Papua New Guinea.
C Centre for Sustainable Tropical Fisheries and Aquaculture and College of Science and Engineering, James Cook University, 1 James Cook Drive, Townsville, Qld 4811, Australia.
D SARDI Aquatic Sciences, 2 Hamra Avenue, West Beach, SA 5024, Australia.
E Corresponding author. Email: william.white@csiro.au
Marine and Freshwater Research 71(6) 627-640 https://doi.org/10.1071/MF19191
Submitted: 24 May 2019 Accepted: 27 June 2019 Published: 24 September 2019
Abstract
This study provides the first detailed investigation of the catches of the shark longline fishery in Papua New Guinea. Fisheries observers collected data on shark catches from a total of 318 longline sets between May and June 2014, before its closure in July 2014. In all, 14 694 sharks were recorded with a total estimated biomass of 439 tonnes (Mg). Eighteen species of sharks were recorded in the observer data, with the most dominant species being Carcharhinus falciformis, which constituted more than 90% of the total catches by both weight and number of individuals. The level of observer misidentification was low (<10%), which reflected the use of region-specific identification guides by well-trained fisheries observers. The most diverse catches were in the Solomon Sea area, whereas catches in most other areas, particularly the Bismarck Sea areas, were less diverse and more strongly dominated by C. falciformis. Size and sex ratios varied by species, highlighting the importance of obtaining species-level information from the fishery being investigated. Any consideration by fisheries managers to reopen this fishery needs to consider the effect this will have on the species targeted and the livelihoods of coastal fishers who also rely on the same resources.
Additional keywords: Carcharhinus falciformis, fisheries managers, livelihoods, sex ratios.
References
Appleyard, S. A., White, W. T., Vieira, S., and Sabub, B. (2018). Artisanal shark fishing in Milne Bay Province, Papua New Guinea: biomass estimation from genetically identified shark and ray fins. Scientific Reports 8, 6693.| Artisanal shark fishing in Milne Bay Province, Papua New Guinea: biomass estimation from genetically identified shark and ray fins.Crossref | GoogleScholarGoogle Scholar | 29703988PubMed |
Baldwin, C. C., Mounts, J. H., Smith, D. G., and Weigt, L. A. (2009). Genetic identification and colour descriptions of early life-history stages of Belizean Phaeoptyx and Astrapogon (Teleostei: Apogonidae) with comments on identification of adult Phaeoptyx. Zootaxa 2008, 1–22.
Barclay, K., and Cartwright, I. (2007). ‘Capturing Wealth From Tuna: Case Studies From the Pacific.’ (Australian National University Press: Canberra, ACT, Australia.)
Baum, J. K., and Blanchard, W. (2010). Inferring shark population trends from generalized linear mixed models of pelagic longline catch and effort data. Fisheries Research 102, 229–239.
| Inferring shark population trends from generalized linear mixed models of pelagic longline catch and effort data.Crossref | GoogleScholarGoogle Scholar |
Chin, A., Simpfendorfer, C. A., White, W. T., Johnson, G. J., McAuley, R. B., and Heupel, M. R. (2017). Crossing lines: a multidisciplinary framework for assessing connectivity of hammerhead sharks across jurisdictional boundaries. Scientific Reports 7, 46061.
| Crossing lines: a multidisciplinary framework for assessing connectivity of hammerhead sharks across jurisdictional boundaries.Crossref | GoogleScholarGoogle Scholar | 28429742PubMed |
Clarke, K. R. (1993). Non-parametric multivariate analyses of changes in community structure. Australian Journal of Ecology 18, 117–143.
| Non-parametric multivariate analyses of changes in community structure.Crossref | GoogleScholarGoogle Scholar |
Clarke, K. R., and Gorley, R. N. (2001). ‘Primer v5: User Manual/Tutorial.’ (Primer-E: Plymouth, UK.)
Clarke, S. C., Harley, S. J., Hoyle, S. D., and Rice, J. S. (2013). Population trends in Pacific oceanic sharks and the utility of regulations on shark finning. Conservation Biology 27, 197–209.
| Population trends in Pacific oceanic sharks and the utility of regulations on shark finning.Crossref | GoogleScholarGoogle Scholar | 23110546PubMed |
Cortés, E. (2000). Life history patterns and correlations in sharks. Reviews in Fisheries Science 8, 299–344.
| Life history patterns and correlations in sharks.Crossref | GoogleScholarGoogle Scholar |
D’Alberto, B. M., Chin, A., Smart, J. J., Baje, L., White, W. T., and Simpfendorfer, C. A. (2017). Age, growth and maturity of oceanic whitetip shark (Carcharhinus longimanus) from Papua New Guinea. Marine and Freshwater Research 68, 1118–1129.
| Age, growth and maturity of oceanic whitetip shark (Carcharhinus longimanus) from Papua New Guinea.Crossref | GoogleScholarGoogle Scholar |
Doulman, D. J., and Wright, A. (1983). Recent developments in Papua New Guinea’s tuna fishery. Marine Fisheries Review 45, 47–59.
Dulvy, N. K., Fowler, S. L., Musick, J. A., Cavanagh, R. D., Kyne, P. M., Harrison, L. R., Carlson, J. K., Davidson, L. N. K., Fordham, S. V., Francis, M. P., Pollock, C. M., Simpfendorfer, C. A., Burgess, G. H., Carpenter, K. E., Compagno, L. J. V., Ebert, D. A., Gibson, C., Heupel, M. R., Livingstone, S. R., Sanciangco, J. C., Stevens, J. D., Valenti, S., and White, W. T. (2014). Extinction risk and conservation of the world’s sharks and rays. eLife 3, e00590.
| Extinction risk and conservation of the world’s sharks and rays.Crossref | GoogleScholarGoogle Scholar | 24448405PubMed |
Ferretti, F., Myers, R. A., Serena, F., and Lotze, H. K. (2008). Loss of large predatory sharks from the Mediterranean Sea. Conservation Biology 22, 952–964.
| Loss of large predatory sharks from the Mediterranean Sea.Crossref | GoogleScholarGoogle Scholar | 18544092PubMed |
Fischer, J., Erikstein, K., D’Offay, B., Guggisberg, S., and Barone, M. (2012). Review of the implementation of the international plan of action for the conservation and management of sharks. FAO Fisheries and Aquaculture Circular number 1076. (Food and Agriculture Organization of the United Nations, Rome, Italy.) Available at http://www.fao.org/3/i3036e/i3036e00.htm [Verified 12 August 2019].
García, V. B., Lucifora, L. O., and Myers, R. A. (2008). The importance of habitat and life history to extinction risk in sharks, skates, rays and chimaeras. Proceedings of the Royal Society of London – B. Biological Sciences 275, 83–89.
| The importance of habitat and life history to extinction risk in sharks, skates, rays and chimaeras.Crossref | GoogleScholarGoogle Scholar |
Grant, M. I., Smart, J. J., White, W. T., Chin, A., Baje, L., and Simpfendorfer, C. A. (2018). Life history characteristics of the silky shark Carcharhinus falciformis from the central west Pacific. Marine and Freshwater Research 69, 562–573.
| Life history characteristics of the silky shark Carcharhinus falciformis from the central west Pacific.Crossref | GoogleScholarGoogle Scholar |
Heithaus, M. R., Frid, A., Wirsing, A. J., and Worm, B. (2008). Predicting ecological consequences of marine top predator declines. Trends in Ecology & Evolution 23, 202–210.
| Predicting ecological consequences of marine top predator declines.Crossref | GoogleScholarGoogle Scholar |
Heupel, M. R., Carlson, J. K., and Simpfendorfer, C. A. (2007). Shark nursery areas: concepts, definition, characterization and assumptions. Marine Ecology Progress Series 337, 287–297.
| Shark nursery areas: concepts, definition, characterization and assumptions.Crossref | GoogleScholarGoogle Scholar |
Hutchinson, M. R., Itano, D. G., Muir, J. A., and Holland, K. N. (2015). Post-release survival of juvenile silky sharks captured in a tropical tuna purse seine fishery. Marine Ecology Progress Series 521, 143–154.
| Post-release survival of juvenile silky sharks captured in a tropical tuna purse seine fishery.Crossref | GoogleScholarGoogle Scholar |
Iversen, E. S., and Yoshida, H. O. (1956). Longlining for tuna in the central equatorial Pacific, 1954. Special Scientific Report – Fisheries number 184. (US Fish and Wildlife Service: Seattle, WA, USA.) Available at https://spo.nmfs.noaa.gov/content/longline-fishing-tuna-central-equatorial-pacific-1954 [Verified 12 August 2019].
Kumoru, L. (2002). National shark longline management plan. National Fisheries Authority, Port Moresby, Papua New Guinea.
Kumoru, L. (2003). The shark longline fishery in Papua New Guinea. National Fisheries Authority, Port Moresby, Papua New Guinea.
Kumoru, L. (2007). Catch information from the FAD-based domestic tuna purse seine fishery in Papua New Guinea. National Fisheries Authority, Port Moresby, Papua New Guinea.
Lack, M., and Meere, F. (2009). Pacific Islands Regional Plan of Action for Sharks: guidance for Pacific Island countries and territories on the conservation and management of sharks. Secretariat of the Pacific Community, Honiara, Solomon Islands.
Last, P. R., and Stevens, J. D. (2009). ‘Sharks and Rays of Australia’, 2nd edn. (CSIRO Publishing: Melbourne, Vic., Australia.)
Løkkeborg, S., and Bjordal, A. (1992). Species and size selectivity in longline fishing: a review. Fisheries Research 13, 311–322.
| Species and size selectivity in longline fishing: a review.Crossref | GoogleScholarGoogle Scholar |
Marine Resources Assessment Group Ltd (2005). ‘Review of Impacts of Illegal, Unreported and Unregulated Fishing on Developing Countries.’ (MRAG Ltd: London, UK.)
McAuley, R. B., Simpfendorfer, C. A., and Hall, N. G. (2007). A method for evaluating the impacts of fishing mortality and stochastic influences on the demography of two long-lived shark stocks. ICES Journal of Marine Science 64, 1710–1722.
| A method for evaluating the impacts of fishing mortality and stochastic influences on the demography of two long-lived shark stocks.Crossref | GoogleScholarGoogle Scholar |
Nicol, S., Lawson, T., Briand, K., Kirby, D., Molony, B., Bromhead, D., Williams, P., Schneiter, E., Kumoru, L., and Hampton, J. (2009). Characterisation of the tuna purse seine fishery in Papua New Guinea. Australian Centre for International Agricultural Research (ACIAR) Technical Reports number 70, ACIAR, Canberra, ACT, Australia.
Pardo, S. A., Kindsvater, H. K., Reynolds, J. D., and Dulvy, N. K. (2016). Maximum intrinsic rate of population increase in sharks, rays, and chimaeras: the importance of survival to maturity. Canadian Journal of Fisheries and Aquatic Sciences 73, 1159–1163.
| Maximum intrinsic rate of population increase in sharks, rays, and chimaeras: the importance of survival to maturity.Crossref | GoogleScholarGoogle Scholar |
Prince, J. D. (2005). Gauntlet fisheries for elasmobranchs – the secret of sustainable shark fisheries. Journal of Northwest Atlantic Fishery Science 35, 407–416.
| Gauntlet fisheries for elasmobranchs – the secret of sustainable shark fisheries.Crossref | GoogleScholarGoogle Scholar |
Smart, J. J., Chin, A., Baje, L., Green, M. E., Appleyard, S. A., Tobin, A. J., Simpfendorfer, C. A., and White, W. T. (2016). Effects of including misidentified sharks in life history analyses: a case study on the grey reef shark Carcharhinus amblyrhynchos from Papua New Guinea. PLoS One 11, e0153116.
| Effects of including misidentified sharks in life history analyses: a case study on the grey reef shark Carcharhinus amblyrhynchos from Papua New Guinea.Crossref | GoogleScholarGoogle Scholar | 27058734PubMed |
Smart, J. J., Chin, A., Baje, L., Tobin, A. J., Simpfendorfer, C. A., and White, W. T. (2017). Life history of the silvertip shark Carcharhinus albimarginatus from Papua New Guinea. Coral Reefs 36, 577–588.
| Life history of the silvertip shark Carcharhinus albimarginatus from Papua New Guinea.Crossref | GoogleScholarGoogle Scholar |
Steneck, R. S. (2012). Apex predators and trophic cascades in large marine ecosystems: learning from serendipity. Proceedings of the National Academy of Sciences of the United States of America 109, 7953–7954.
| Apex predators and trophic cascades in large marine ecosystems: learning from serendipity.Crossref | GoogleScholarGoogle Scholar | 22586126PubMed |
Stevens, J. D., Bonfil, R., Dulvy, N. K., and Walker, P. A. (2000). The effects of fishing on sharks, rays, and chimaeras (chondrichthyans), and the implications for marine ecosystems. ICES Journal of Marine Science 57, 476–494.
| The effects of fishing on sharks, rays, and chimaeras (chondrichthyans), and the implications for marine ecosystems.Crossref | GoogleScholarGoogle Scholar |
Strasburg, D. W. (1958). Distribution, abundance, and habits of pelagic sharks in the central Pacific Ocean. Fishery Bulletin 138, 335–361.
Tillett, B. J., Field, I. C., Bradshaw, C. J. A., Johnson, G., Buckworth, R. C., Meekan, M. G., and Ovenden, J. R. (2012). Accuracy of species identification by fisheries observers in a north Australian shark fishery. Fisheries Research 127–128, 109–115.
| Accuracy of species identification by fisheries observers in a north Australian shark fishery.Crossref | GoogleScholarGoogle Scholar |
Tolotti, M. T., Filmalter, J. D., Bach, P., Travassos, P., Seret, B., and Dagorn, L. (2015). Banning is not enough: the complexities of oceanic shark management by tuna regional fisheries management organizations. Global Ecology and Conservation 4, 1–7.
| Banning is not enough: the complexities of oceanic shark management by tuna regional fisheries management organizations.Crossref | GoogleScholarGoogle Scholar |
Usu, T., Kumasi, B., and Baje, L. (2015). Annual report to the Commission. Part 1: information on fisheries, research and statistics, 2014. National Fisheries Authority, Port Moresby, Papua New Guinea.
Vandeperre, F., Aires-da-Silva, A., Fontes, J., Santos, M., Serrão Santos, R., and Afonso, P. (2014). Movements of blue sharks (Prionace glauca) across their life history. PLoS One 9, e103538.
| Movements of blue sharks (Prionace glauca) across their life history.Crossref | GoogleScholarGoogle Scholar | 25119716PubMed |
Vianna, G. M. S., Meekan, M. G., Meeuwig, J. J., and Speed, C. W. (2013). Environmental influences on patterns of vertical movement and site fidelity of grey reef sharks (Carcharhinus amblyrhynchos) at aggregation sites. PLoS One 8, e60331.
| Environmental influences on patterns of vertical movement and site fidelity of grey reef sharks (Carcharhinus amblyrhynchos) at aggregation sites.Crossref | GoogleScholarGoogle Scholar |
Vieira, S., Kinch, K., Yaman, L., and White, W. T. (2017). Artisanal shark fishing in the Louisiade Archipelago, Papua New Guinea: socio-economic characteristics and management options. Oceans & Coastal Development 137, 43–56.
| Artisanal shark fishing in the Louisiade Archipelago, Papua New Guinea: socio-economic characteristics and management options.Crossref | GoogleScholarGoogle Scholar |
Wearmouth, V. J., and Sims, D. W. (2008). Sexual segregation in marine fish, reptiles, birds and mammals: behaviour patterns, mechanisms and conservation implications. In ‘Advances in Marine Biology’. (Ed. D. W. Sims.) pp. 107–170. (Elsevier Academic Press: San Diego, CA, USA.)
Western and Central Pacific Fisheries Commission (2013). Conservation and management measures for silky sharks. Conservation and Management Measure 2013–08, WCPFC, Cairns, Qld, Australia.
White, W. T., Platell, M. E., and Potter, I. C. (2001). Relationship between reproductive biology and age composition and growth in Urolophus lobatus (Batoidea: Urolophidae). Marine Biology 138, 135–147.
| Relationship between reproductive biology and age composition and growth in Urolophus lobatus (Batoidea: Urolophidae).Crossref | GoogleScholarGoogle Scholar |
White, W. T., Bartron, C., and Potter, I. C. (2008). Catch composition and reproductive biology of Sphyrna lewini (Carcharhiniformes, Sphyrnidae) in Indonesian waters. Journal of Fish Biology 72, 1675–1689.
| Catch composition and reproductive biology of Sphyrna lewini (Carcharhiniformes, Sphyrnidae) in Indonesian waters.Crossref | GoogleScholarGoogle Scholar |
White, W. T., Baje, L., Appleyard, S. A., Pogonoski, J. J., and Mana, R. R. (2017). Sharks and rays of Papua New Guinea. Australian Centre for International Agricultural Research (ACIAR) Monograph number 189, ACIAR, Canberra, ACT, Australia.
White, W. T., Baje, L., Simpfendorfer, C. A., Appleyard, S. A., Chin, A., Sabub, B., Rochel, E., and Naylor, G. J. P. (2019). Elasmobranch bycatch in the demersal prawn trawl fishery in the Gulf of Papua, Papua New Guinea. Scientific Reports 9, 9254.
| Elasmobranch bycatch in the demersal prawn trawl fishery in the Gulf of Papua, Papua New Guinea.Crossref | GoogleScholarGoogle Scholar | 31239504PubMed |
Wood, M. (2004). Statistical inference using bootstrap confidence intervals. Significance 1, 180–182.
| Statistical inference using bootstrap confidence intervals.Crossref | GoogleScholarGoogle Scholar |
