Assessing pinniped bycatch mortality with uncertainty in abundance and post-release mortality: A case study from Chile

Punt, André E.; Sepúlveda, Maritza; Siple, Margaret C.; Moore, Jeff; Francis, Tessa B.; Hammond, Philip S.; Heinemann, Dennis; Long, Kristy J.; Oliva, Doris; Reeves, Randall R.; Sigurðsson, Guðjón Már; Víkingsson, Gísli A.; Wade, Paul R.; Williams, Rob; Zerbini, Alexandre N.

doi:10.1016/j.fishres.2020.105816

Cited by 12 publications

(10 citation statements)

References 25 publications

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“…In contrast to bycatch in purse seines, mortality of pinnipeds in trawl fisheries is much higher (Punt et al 2021). This is because after entering the trawl net, pinnipeds have difficulty finding a way back out, so are either drowned or pushed back in the net and crushed by the weight of incoming fish (Reyes et al 2013, Crespo et al 2021; Fig.…”

Section: Resultsmentioning

confidence: 99%

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Sea lion and fur seal interactions with fisheries and aquaculture in South American waters: threats and management perspectives

et al. 2023

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1. The main issue affecting the conservation of most pinniped species has been identified as interactions with fisheries and aquaculture. In South American waters in particular, this problem has not been well evaluated. Consequently, there is an urgent need for research and conservation measures to address the problem, particularly for species of conservation concern. 2. In this study, we reviewed published and unpublished research and observations from the last 25 years on operational and biological interactions between pinnipeds and fisheries and salmonid aquaculture activities in South American waters, and the conservation and management implications of these interactions in the near future. 3. Two species of pinnipeds are primarily involved in biological and operational interactions with fisheries and aquaculture in South America: the South American sea lion Otaria flavescens and the South American fur seal Arctocephalus australis. Although phocids are present in South American waters, there is no published research on conflicts between phocids and human activities. 4. Interactions between fisheries and pinnipeds have been reported by many countries. In South American waters, interactions mostly involve male and Keywords bycatch, mortality, pinnipeds, South America, South American sea lion Otaria flavescens, South American fur seal Arctocephalus australis

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Section: Resultsmentioning

confidence: 99%

“…The low mortality of SASLs in these fisheries (those that interact during fishing operations) is explained because they readily jump over the cork line before the haul is ended, and escape (Fig. 3a; Punt et al 2021).…”

Section: Fisheriesmentioning

confidence: 99%

Sea lion and fur seal interactions with fisheries and aquaculture in South American waters: threats and management perspectives

et al. 2023

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“…For example, Brandon et al (2017) show that incorporating multiple abundance estimates for data-rich populations can lead to increased stability of calculated values for PBR through time, which could reduce regulatory uncertainty that may be associated with some human activities managed using the PBR reference point. With more data or resources, assessments that are more sophisticated (and complicated) than simple reference points such as PBR are possible (e.g., Goldsworthy and Page, 2007;Punt et al, 2020Punt et al, , 2021a.…”

Section: Alternative Assessment Methodsmentioning

confidence: 99%

Best Practices for Assessing and Managing Bycatch of Marine Mammals

et al. 2021

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Bycatch in marine fisheries is the leading source of human-caused mortality for marine mammals, has contributed to substantial declines of many marine mammal populations and species, and the extinction of at least one. Schemes for evaluating marine mammal bycatch largely rely on estimates of abundance and bycatch, which are needed for calculating biological reference points and for determining conservation status. However, obtaining these estimates is resource intensive and takes careful long-term planning. The need for assessments of marine mammal bycatch in fisheries is expected to increase worldwide due to the recently implemented Import Provisions of the United States Marine Mammal Protection Act. Managers and other stakeholders need reliable, standardized methods for collecting data to estimate abundance and bycatch rates. In some cases, managers will be starting with little or no data and no system in place to collect data. We outline a comprehensive framework for managing bycatch of marine mammals. We describe and provide guidance on (1) planning for an assessment of bycatch, (2) collecting appropriate data (e.g., abundance and bycatch estimates), (3) assessing bycatch and calculating reference points, and (4) using the results of the assessment to guide marine mammal bycatch reduction. We also provide a brief overview of available mitigation techniques to reduce marine mammal bycatch in various fisheries. This paper provides information for scientists and resource managers in the hope that it will lead to new or improved programs for assessing marine mammal bycatch, establishing best practices, and enhancing marine mammal conservation globally.

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“…Additional incidental mortalities of AFS entangled in trawls with excluder devices have been reported by CCAMLR (2018). Finally, entanglement of pinnipeds in commercial trawl nets can lead to sub-lethal injury or delayed mortality (Punt et al 2021, Sepúlveda et al 2023), but to the best of our knowledge every discussion about the Antarctic krill fishery assumes that any AFS released alive are 'unharmed'. Therefore, mortalities are likely somewhat higher than those reported here.…”

Section: Incidental Mortality In the Krill Fisherymentioning

confidence: 99%

Evaluating threats to South Shetland Antarctic fur seals amidst population collapse

Krause,

Brownell,

Bonin

et al. 2023

Mammal Review

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Antarctic fur seals (Arctocephalus gazella) are an iconic marine mammal, an important component of Antarctic ecosystems, and a key indicator species for regional fisheries management. Recent studies have demonstrated Arctocephalus gazella is composed of at least four distinct subpopulations, including one breeding on the South Shetland Islands. These South Shetland Antarctic fur seals (SSAFS) are the highest latitude population of otariids in the world. As such, this subpopulation faces a unique array of environmental and ecological challenges, harbours a disproportionately large reservoir of genetic diversity for the species, and has experienced catastrophic population decline in the last 15 years (2008–2023). We review the array of current and potential threats to the successful recovery of SSAFS. If decision makers wish to promote resilience and support a robust population of this species with future recovery potential, actions are needed to address threats ranging from uncertain to critical, including debris entanglement, climate change, incidental mortality, and resource competition with the krill fishery. In particular, the risks associated with overlap in the spatial and temporal distribution of the young of the year and the krill fishery should be addressed carefully. There is an urgent need for updated population estimates for all Antarctic fur seal subpopulations, analysis on the population viability of the SSAFS, and further characterising summer and winter foraging behaviours to better inform potential conservation actions.

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Assessing pinniped bycatch mortality with uncertainty in abundance and post-release mortality: A case study from Chile

Cited by 12 publications

References 25 publications

Sea lion and fur seal interactions with fisheries and aquaculture in South American waters: threats and management perspectives

Sea lion and fur seal interactions with fisheries and aquaculture in South American waters: threats and management perspectives

Best Practices for Assessing and Managing Bycatch of Marine Mammals

Evaluating threats to South Shetland Antarctic fur seals amidst population collapse

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