Incidental capture of the short-beaked common dolphin (Delphinus delphis) in the industrial purse seine fishery in northern Chile

González-But, Juan Carlos; Sepúlveda, Maritza

doi:10.4067/s0718-19572016000200019

Cited by 12 publications

(2 citation statements)

References 6 publications

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“…The diagnosis of this condition is difficult in carcasses with moderate to advanced autolysis, therefore, the real magnitude of this problem is hard to assess when access to fresh stranded carcasses is limited. However, an on-site study performed in the south-central and southern Chile highlighted that the species most commonly bycaught are Commerson's dolphin (Cephalorhynchus commersonii), Chilean dolphin (C. eutropia), bottlenose dolphin and Burmeister's porpoise (González-But and Sepúlveda, 2016).…”

Section: Discussionmentioning

confidence: 99%

Pathological Findings in Cetaceans Sporadically Stranded Along the Chilean Coast

et al. 2020

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Chile has one of the largest coastlines in the world with at least 50% of the world cetacean species occurring within its jurisdictional waters. However, little is known regarding the health status and main causes of death in cetaceans off continental Chile. In this report, we summarize the major pathological findings and most likely causes of death of 15 cetaceans stranded along the Chilean coast between 2010 and 2019. Drowning, due to fishing gear entanglement, was the most likely cause of death in 3 Burmeister's porpoises (Phocoena spinipinnis), a Risso's dolphin (Grampus griseus) and a short-beaked common dolphin (Delphinus delphis). Additionally, the 3 Burmeister's porpoises had mild to moderate eosinophilic and histiocytic pneumonia with pulmonary vasculitis associated with the nematode Pseudalius inflexus. A fourth Burmeister's porpoise died of drowning after stranding alive at a sandy beach. Two fin whales (Balaenoptera physalus) died most likely of trauma associated with large vessel collision. A long-finned pilot whale (Globicephala melas) and an Orca (Orcinus orca) stranded most likely due to traumatic intra/interspecific interaction with other odontocete although for the pilot whale, osteoporosis with loss of alveolar bone and all teeth could have played a role. For a Strap-toothed beaked whale (Mesoplodon layardi), Dwarf sperm whale (Kogia sima), Southern right-whale dolphin (Lissodelphis peronii), Peale's dolphin (Lagenorhynchus australis) and a dusky dolphin (Lagenorhynchus obscurus), the cause of stranding could not be determined. This study shows, despite the small number of examined carcasses that in Chile, human related trauma is an important cause of single cetacean stranding events.

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Section: Discussionmentioning

confidence: 99%

Pathological Findings in Cetaceans Sporadically Stranded Along the Chilean Coast

et al. 2020

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“…This observation is useful for obtaining discarded bycatch, particularly discarded at sea. Onboard survey is also useful to observe the bycatch of marine mammals and reptiles because fishers usually release them into the sea as quick as possible (Gonzalez-But & Sepulveda, 2016;Kovacs & Cox, 2014;Machado et al, 2016). In some countries, those protected species cannot be caught and kept on board.…”

Section: Field Surveysmentioning

confidence: 99%

Ecological impacts of fishing gears in Ko Chang, Trat Province, Thailand

Suebpala

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Knowledge of ecological impacts of fishing, especially in small-scale sector, is not always readily available, making it difficult to employ an ecosystem-based approach to fisheries management and to achieve sustainability. The topic of this dissertation was formulated with the aim to enhance this knowledge through conducting researches in Mu Ko Chang, Trat Province, the Eastern Gulf of Thailand. This study focuses on two main types of impacts, i.e. bycatch and habitat damages, consisting of three research modules: 1) assessing existing knowledge and analyzing the knowledge gap regarding bycatch and habitat impacts of fishing methods in Thai waters; 2) investigating fishing impacts in terms of bycatch and habitat damages, of some fishing gears in Ko Chang, Trat Province, and; 3) analyzing relative ecological impacts of fishing gears and to rank the levels of severity caused by different fishing gears. According to the literature review and gap analysis, a major gap of knowledge on the ecological impacts of fishing gears in Thailand was found, particularly the data on bycatch (retained and discarded) and habitat damages. The onboard surveys of bycatch for nine small-scale fishing gears in Ko Chang revealed that some of the gears, particularly trammel nets, crab traps, and gillnets, produced the higher number of bycatch in terms of biomass and species richness. A study on the impacts of fish traps on coral reefs revealed various possible impacts including physical damages on corals, impacts from sediment dispersion, ecosystem imbalance due to exploitation of reef fish, and marine debris. A comparative study on macrobenthic community between permanent and six-month closure areas exhibited the impacts of fishing activities (trawlers, push nets, and dredges) in terms of the reduction on macrobenthic abundance. An expert consultation workshop was also convened aiming to rate the impacts of fishing gears including large- and small-scale based on existing knowledge, surveyed data, and personal experience of the expert. It showed that otter-board trawls and pair-trawls were rated with the highest score of bycatch and habitat impacts.� In terms of small-scale fishing gears, bycatch impacts caused by shrimp trammel nets and crab gill nets were mostly concerned. This dissertation enhances understandings of the ecological impacts of fishing gears on marine ecosystems in Thailand that are highly required for ecosystem-based fisheries management.

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Common Dolphin Delphinus delphis Linnaeus, 1758

Tavares

2024

Handbook of the Mammals of Middle and South America

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Incidental capture of the short-beaked common dolphin (Delphinus delphis) in the industrial purse seine fishery in northern Chile

Cited by 12 publications

References 6 publications

Pathological Findings in Cetaceans Sporadically Stranded Along the Chilean Coast

Pathological Findings in Cetaceans Sporadically Stranded Along the Chilean Coast

Ecological impacts of fishing gears in Ko Chang, Trat Province, Thailand

Common Dolphin Delphinus delphis Linnaeus, 1758

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