CSIRO Publishing blank image blank image blank image blank imageBooksblank image blank image blank image blank imageJournalsblank image blank image blank image blank imageAbout Usblank image blank image blank image blank imageShopping Cartblank image blank image blank image You are here: Journals > Marine & Freshwater Research   
Marine & Freshwater Research
Journal Banner
  Advances in the Aquatic Sciences
 
blank image Search
 
blank image blank image
blank image
 
  Advanced Search
   

Journal Home
About the Journal
Editorial Board
Contacts
Content
Online Early
Current Issue
Just Accepted
All Issues
Special Issues
Research Fronts
Sample Issue
For Authors
General Information
Instructions to Authors
Submit Article
Open Access
For Referees
General Information
Review Article
Referee Guidelines
Annual Referee Index
For Subscribers
Subscription Prices
Customer Service
Print Publication Dates

blue arrow e-Alerts
blank image
Subscribe to our Email Alert or RSS feeds for the latest journal papers.

red arrow Connect with us
blank image
facebook twitter youtube

 

Article << Previous     |     Next >>        Online Early    

Combining in-trawl video with observer coverage improves understanding of protected and vulnerable species by-catch in trawl fisheries

Vanessa F. Jaiteh A C , Simon J. Allen A , Jessica J. Meeuwig B and Neil R. Loneragan A

A Murdoch University Cetacean Research Unit, Centre for Fish, Fisheries and Aquatic Ecosystems Research, School of Veterinary and Life Sciences, Murdoch University, Murdoch, WA 6150, Australia.
B Centre for Marine Futures and School of Animal Biology, Oceans Institute, University of Western Australia, Crawley, WA 6009, Australia.
C Corresponding author. Email: v.jaiteh@murdoch.edu.au

Marine and Freshwater Research - http://dx.doi.org/10.1071/MF13130
Submitted: 28 May 2013  Accepted: 10 December 2013   Published online: 2 July 2014


 
PDF (461 KB) $25
 Export Citation
 Print
  
Abstract

Assessments of incidental wildlife mortality resulting from fishing rarely account for unobserved by-catch. We assessed by-catch of protected and vulnerable wildlife species in an Australian trawl fishery by comparing in-trawl video footage with data collected by an on-board observer. Data were obtained from 44 commercial trawls with two different by-catch reduction devices (BRDs). Eighty-six individuals from six major taxa (dolphins, sharks, rays, sea snakes, turtles and sygnathids) were documented from video analysis, including the endangered scalloped hammerhead shark (Sphyrna lewini) and the critically endangered green sawfish (Pristis zijsron). On the basis of the 2008–2009 fishing effort of 4149 trawls and scaling from these results, we estimated the annual catch of protected and vulnerable species (± 1 s.e.) at 8109 ± 910 individuals. Only 34% of by-catch was expelled through the BRDs. Independent observer data for the 44 trawls showed that 77% of the landed by-catch from these taxa were dead when discarded. The results indicate that unaccounted by-catch in trawl fisheries can be substantial, and that current methods of recording by-catch on-board vessels are likely to underestimate total fishing mortality. We recommend gear modifications and their validation through dedicated observer coverage, combined with in-trawl video camera deployments to improve current approaches to by-catch mitigation.

Additional keywords: incidental mortality, IUCN status, observer program, Tursiops truncatus.


References

Allen, S., and Loneragan, N. (2010). Reducing dolphin bycatch in the Pilbara Finfish Trawl Fishery. Final report to the Fisheries Research and Development Corporation (FRDC). Murdoch University, Perth.

Altmann, J. (1974). Observational study of behavior: sampling methods. Behaviour 49, 227–266.
CrossRef | CAS | PubMed |

Alverson, D. L., and Hughes, S. E. (1996). Bycatch: from emotion to effective natural resource management. Reviews in Fish Biology and Fisheries 6, 443–462.
CrossRef |

Bache, S. J. (2003). Bycatch mitigation tools: selecting fisheries, setting limits, and modifying gear. Ocean and Coastal Management 46, 103–125.
CrossRef |

Baum, J. K., Meeuwig, J. J., and Vincent, A. C. J. (2003a). Bycatch of the seahorse, Hippocampus erectus, in a Gulf of Mexico Shrimp Fishery: implications for conservation. Fishery Bulletin 101, 722–731.

Baum, J. K., Myers, R. A., Kehler, D. G., Worm, B., Harley, S. J., and Doherty, P. A. (2003b). Collapse and conservation of shark populations in the Northwest Atlantic. Science 299, 389–392.
CrossRef | CAS | PubMed |

Bellido, J. M., Santos, M. B., Pennino, M. G., Valeiras, X., and Pierce, G. J. (2011). Fishery discards and bycatch: solutions for an ecosystem approach to fisheries management? Hydrobiologia 670, 317–333.
CrossRef |

Brewer, D., Heales, D., Milton, D., Dell, Q., Fry, G., Venables, B., and Jones, P. (2006). The impact of turtle excluder devices and bycatch reduction devices on diverse tropical marine communities in Australia’s northern prawn trawl fishery. Fisheries Research 81, 176–188.
CrossRef |

Broadhurst, M. K., Suuronen, P., and Hulme, A. (2006). Estimating collateral mortality from towed fishing gear. Fish and Fisheries 7, 180–218.
CrossRef |

Camhi, M., Valenti, S., Fordham, S., Fowler, S., and Gibson, C. (2009). The conservation status of pelagic sharks and rays: report of the IUCN Shark Specialist Group pelagic shark red list workshop. IUCN Species Survival Commission Shark Specialist Group, Newbury, UK.

Campana, S. E., Joyce, W., and Manning, M. J. (2009). Bycatch and discard mortality in commercially caught blue sharks Prionace glauca assessed using archival satellite pop-up tags. Marine Ecology Progress Series 387, 241–253.
CrossRef |

Chopin, F. S., and Arimoto, T. (1995). The condition of fish escaping from fishing gears – a review. Fisheries Research 21, 315–327.
CrossRef |

Chopin, F., Inoue, Y., and Arimoto, T. (1996). Development of a catch mortality model. Fisheries Research 25, 377–382.
CrossRef |

Cummins, A. (2004). The Marine Stewardship Council: a multi-stakeholder approach to sustainable fishing. Corporate Social Responsibility and Environmental Management 11, 85–94.
CrossRef |

Davis, M. W. (2002). Key principles for understanding fish bycatch discard mortality. Canadian Journal of Fisheries and Aquatic Sciences 59, 1834–1843.
CrossRef |

Dulvy, N. K., Baum, J. K., Clarke, S., Compagno, L. J. V., Cortes, E., Domingo, A., Fordham, S., Fowler, S., Francis, M. P., and Gibson, C. (2008). You can swim but you can’t hide: the global status and conservation of oceanic pelagic sharks and rays. Aquatic Conservation: Marine and Freshwater Ecosystems 18, 459–482.
CrossRef |

Fletcher, W. J., and Santoro, K. (2009). State of the fisheries report 2008/09. WA Department of Fisheries, Perth.

Fletcher, W. J., and Santoro, K. (2010). State of the fisheries and aquatic resources report 2009/10. WA Department of Fisheries, Perth.

Fletcher, W. J., and Santoro, K. (2011). State of the fisheries and aquatic resources report 2010/11. WA Department of Fisheries, Perth.

Fletcher, W. J., and Santoro, K. (2012). Status reports of the fisheries and aquatic resources of Western Australia 2011/12: the state of the fisheries. WA Department of Fisheries, Perth.

Foster, S. J., and Vincent, A. C. J. (2004). Life history and ecology of seahorses: implications for conservation and management. Journal of Fish Biology 65, 1–61.
CrossRef |

Hall, S. J., and Mainprize, B. (2004). Towards ecosystem-based fisheries management. Fish and Fisheries 5, 1–20.
CrossRef |

Hall, M. A., Alverson, D. L., and Metuzals, K. I. (2000). By-catch: problems and solutions. Marine Pollution Bulletin 41, 204–219.
CrossRef | CAS |

Heppell, S., Caswell, H., and Crowder, L. (2000). Life histories and elasticity patterns: perturbation analysis for species with minimal demographic data. Ecology 81, 654–665.
CrossRef |

Hill, B. J., and Wassenberg, T. J. (1990). Fate of discards from prawn trawlers in Torres Strait. Marine and Freshwater Research 41, 53–64.
CrossRef |

Jaiteh, V. F., Allen, S. J., Meeuwig, J. J., and Loneragan, N. R. (2013). Subsurface behavior of bottlenose dolphins (Tursiops truncatus) interacting with fish trawl nets in northwestern Australia: implications for bycatch mitigation. Marine Mammal Science 29, 266–281.
CrossRef |

Kaiser, M. J., and Spencer, B. (1995). Survival of by-catch from a beam trawl. Marine Ecology Progress Series 126, 31–38.
CrossRef |

Kennelly, S. J. (1995). The issue of bycatch in Australia’s demersal trawl fisheries. Reviews in Fish Biology and Fisheries 5, 213–234.
CrossRef |

Lewison, R. L., Crowder, L. B., Read, A. J., and Freeman, S. A. (2004). Understanding impacts of fisheries bycatch on marine megafauna. Trends in Ecology & Evolution 19, 598–604.
CrossRef |

Lewison, R. L., Soykan, C. U., and Franklin, J. (2009). Mapping the bycatch seascape: multispecies and multi-scale spatial patterns of fisheries bycatch. Ecological Applications 19, 920–930.
CrossRef | PubMed |

Mandelman, J. W., and Farrington, M. A. (2007). The estimated short-term discard mortality of a trawled elasmobranch, the spiny dogfish (Squalus acanthias). Fisheries Research 83, 238–245.
CrossRef |

Newman, S., Wakefield, C., Skepper, C., Marriott, R., Cliff, M., Boddington, D., Mitsopoulos, G., Rome, B., Green, R., and Blazeski, S. (2011). North Coast demersal fisheries status report. In ‘State of the Fisheries and Aquatic Resources Report 2010/11’. (Eds W. J. Fletcher and K. Santoro.) pp. 190–212. WA Department of Fisheries, Perth.

Pascoe, S., and Revill, A. (2004). Costs and benefits of bycatch reduction devices in European brown shrimp trawl fisheries. Environmental and Resource Economics 27, 43–64.
CrossRef |

Read, A. J. (2008). The looming crisis: interactions between marine mammals and fisheries. Journal of Mammalogy 89, 541–548.
CrossRef |

Reeves, R. R., Smith, B. D., Crespo, E. A., and Nortarbartolo di Sciara, G. (2003). ‘Dolphins, Whales, and Porpoises: 2002–2010 Conservation Action Plan for the World’s Cetaceans.’ (IUCN/SSC Cetacean Specialist Group, IUCN: Gland, Switzerland.)

Reeves, R. R., Berggren, P., Crespo, E. A., Gales, N., Northridge, S. P., Nortarbartolo di Sciara , G., Perrin, W. F., Read, A. J., Rogan, E., and Smith, B. D. (2005). ‘Global Priorities for Reduction of Cetacean Bycatch.’ (World Wildlife Fund, Geneva)

Roberts, C. M., and Hawkins, J. P. (1999). Extinction risk in the sea. Trends in Ecology & Evolution 14, 241–246.
CrossRef |

Ross, M. R., and Hokenson, S. R. (1997). Short-term mortality of discarded finfish bycatch in the Gulf of Maine fishery for northern shrimp Pandalus borealis. North American Journal of Fisheries Management 17, 902–909.
CrossRef |

Stephenson, P. C., and Chidlow, J. (2003). Bycatch in the Pilbara trawl fishery. Final Report to Natural Heritage Trust. (WA Department of Fisheries, Perth.)

Stephenson, P. C., and Wells, S. (2006). Evaluation of the effectiveness of reducing dolphin catches with pingers and exclusion grids in the Pilbara trawl fishery. Final report to Fisheries Research and Development Corporation on Project No. 2004/068. Fisheries Research Report No. 173. (WA Department of Fisheries, Perth.)

Stephenson, P. C., Wells, S., and King, J. A. (2008). Evaluation of exclusion grids to reduce the catch of dolphins, turtles, sharks and rays in the Pilbara trawl fishery. DBIF Funded Project. Fisheries Research Report No. 171. (WA Department of Fisheries, Perth.)

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.
CrossRef |

Stobutzki, I. C., Miller, M. J., Jones, P., and Salini, J. P. (2001). Bycatch diversity and variation in a tropical Australian penaeid fishery; the implications for monitoring. Fisheries Research 53, 283–301.
CrossRef |

Suuronen, P. (2005). ‘Mortality of fish escaping trawl gears: by Petri Suuronen.’ (FAO: Rome.)

Suuronen, P., Turunen, T., Kiviniemi, M., and Karjalainen, J. (1995). Survival of vendace (Coregonus albula) escaping from a trawl cod end. Canadian Journal of Fisheries and Aquatic Sciences 52, 2527–2533.
CrossRef |

Thompson, S. K. (2002). ‘Sampling.’ 2nd edn. (Wiley: New York.)

Ward, T. (2001). Age structures and reproductive patterns of two species of sea snake, Lapemis hardwickii Grey (1836) and Hydrophis elegans (Grey 1842), incidentally captured by prawn trawlers in northern Australia. Marine and Freshwater Research 52, 193–203.
CrossRef |

Wassenberg, T. J., and Hill, B. J. (1990). Partitioning of material discarded from prawn trawlers in Moreton Bay. Marine and Freshwater Research 41, 27–36.
CrossRef |

Watling, L., and Norse, E. A. (1998). Disturbance of the seabed by mobile fishing gear: a comparison to forest clearcutting. Conservation Biology 12, 1180–1197.
CrossRef |


   
Subscriber Login
Username:
Password:  

 
    
Legal & Privacy | Contact Us | Help

CSIRO

© CSIRO 1996-2014