Interactions between gillnet fisheries and small cetaceans in northern Rio de Janeiro, Brazil: 2001-2002

Beneditto, Ana Paula Madeira Di

doi:10.5597/lajam00035

Cited by 49 publications

(30 citation statements)

References 8 publications

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“…In this study, both published and unpublished strandings, incidental catches and sightings were reviewed. Stranded and incidentally captured animals have been recorded by various research groups along the coast of South America (Praderi 1991a, Simões-Lopes & Ximenez 1993, Ott & Danilewicz 1996, Lucena et al 1998, Bastida et al 2001, Di Beneditto 2003.…”

Section: Methodsmentioning

confidence: 99%

“…Currently, the main source of human-induced mortality in the southern range of the species is bycatch in fishing gear, particularly bottom set and drift gillnets (e.g. Zerbini & Kotas 1998, Di Beneditto 2003. Other harmful anthropogenic activities, such as coastal development, oil and gas exploration and fisheries, may cause habitat degradation, underwater noise and overfishing of prey species.…”

Section: Atlantic Spotted Dolphinmentioning

confidence: 99%

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Distribution and habitat characteristics of dolphins of the genus Stenella (Cetacea: Delphinidae) in the southwest Atlantic Ocean

Moreno¹,

Zerbini²,

Danilewicz³

et al. 2005

Mar. Ecol. Prog. Ser.

110

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The distribution of dolphins of the genus Stenella is poorly known in the southwest Atlantic Ocean. A complete review of records (n = 311) of these dolphin species was performed to describe distribution and habitat. Atlantic spotted dolphins S. frontalis occur in both southern (21 to 33°S) and northern Brazil (north of 06°S), with a hiatus in its distribution off eastern South America. This species presents the highest preference for nearshore habitats, restricted to waters within the 1000 m isobath. Pantropical spotted dolphins S. attenuata are found in tropical waters as far south as 22°S and are mainly observed off northeastern South America. They occur beyond the continental shelf break in depths > 850 m. Clymene dolphins S. clymene are distributed in deep waters (1390 to 4500 m) as far south as 30°S. Strandings are more common where the continental shelf is narrower. Spinner dolphins S. longirostris are found in oceanic waters as far south as 30°S. They inhabit tropical waters over the shelf and slope (depths ranging from 170 to 2700 m). The striped dolphin S. coeruleoalba is the least known species of the genus in the western South Atlantic. Most records are from temperate waters in southern Brazil and Argentina. The distributions of S. attenuata, S. clymene and S. longirostris overlap to a great extent and are predominantly oceanic and associated with warm ocean currents. S. frontalis seems to prefer a different, coastal habitat, influenced both by warm currents and upwelling areas. The discontinuous distribution of this species suggests that an isolated population inhabits the southern coast of Brazil.

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Section: Methodsmentioning

confidence: 99%

Section: Atlantic Spotted Dolphinmentioning

confidence: 99%

Distribution and habitat characteristics of dolphins of the genus Stenella (Cetacea: Delphinidae) in the southwest Atlantic Ocean

Moreno¹,

Zerbini²,

Danilewicz³

et al. 2005

Mar. Ecol. Prog. Ser.

110

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“…For modelling purposes (in Secchi and Fletcher, 2004) the bycatch estimates for the other FMAs were compiled from the literature (Table 1). Praderi et al, 1989;Corcuera, 1994;Corcuera et al, 1994;Pinedo, 1994;Siciliano, 1994;Cremer et al, 1995;Praderi, 1997;Secchi et al, 1997;Zanelato, 1997;Corcuera et al, 2000;Di Beneditto et al, 1998;Kinas and Secchi, 1998;Ott, 1998;Capozzo et al, 2000;Di Beneditto and Ramos, 2001a,b;Bertozzi and Zerbini, 2002;Rosas et al, 2002;Santos et al, 2002, Di Beneditto, 2003, and this study. …”

Section: Introductionmentioning

confidence: 99%

Incidental catches of franciscana in coastal gillnet fisheries in the Franciscana Management Area III: period 1999-2000

Secchi¹,

Kinas²,

Muelbert³

2004

Lat. Am. J. Aquat. Mamm.

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-Bycatch of franciscanas in fishing operations along the western South Atlantic Ocean has been observed for approximately 60 years. Reports on bycatch in shark gillnet fisheries off Uruguay date back to the early 1940s. A decade later, gillnet fisheries for bottom-dwelling fish became the major conservation concern for franciscanas in both Brazil and Argentina. A small portion (c. 10%), of the coastal gillnet fleet which operate from the port of Rio Grande (southern Rio Grande do Sul, Brazil) was monitored in 1999-2000. The total annual bycatch was estimated to be 946 franciscanas (non-parametric CI = 467 -1525) for the year 1999 and 719 (non-parametric CI = CI: 248 -1413) dolphins for 2000. The total bycatch for the whole FMA III was 1106 (CI: 578 -1915) for 1999 and 992 (CI: 475 -1832) for 2000. Since data were not normally distributed confidence intervals were estimated by non-parametric bootstrap. Despite strong evidence of decline for the stock from FMA III, no mitigation strategy has been established or designed. Instead, fishing effort is still very high, it is increasing and bycatch is uncontrolled. Thus, prompt management action is required. Regulation of gillnet fishing effort might be the only suitable immediate action to mitigate the bycatch.Resumo -Capturas acidentais de toninhas em operações de pesca têm sido observadas por aproximadamente 60 anos ao longo de sua distribuição no Atlântico Sul-Ocidental. Em águas uruguaias, os registros de capturas nas redes de emalhe, usadas na pesca de tubarões, datam do início dos anos 40. Uma década mais tarde, a pescaria de peixes demersais com redes de emalhe tornou-se a principal preocupação em relação à conservação da espécie tanto no Brasil como na Argentina. Em 1999 e 2000, monitorou-se uma pequena parcela (c. 10%) da frota costeira que opera com redes de emalhe na costa sul do Rio Grande do Sul, Brasil. Estimou-se uma captura acidental anual de 946 toninhas (I.C. não-paramétrico = 248 -1423) para o ano de 1999 e de 719 toninhas (I.C. não-paramétrico = 248 -1423) para o ano de 2000. A captura acidental anual para toda a FMA III (FMA: Área de Manejo para a Toninha) foi estimada em 1106 (I.C. = 578 -1915) e 992 (I.C. = 475 -1832) toninhas em 1999 e 2000, respectivamente. Os intervalos de confiança foram estimados através de procedimentos de "bootstrap" não-paramétrico, visto que os dados não apresentavam distribuição normal. Até o presente, nenhuma estratégia mitigatória foi implementada ou elaborada, apesar das fortes evidências que o estoque da FMA III está declinando. Além disso, o esforço pesqueiro continua elevado, crescendo e as capturas acidentais sem controle. Ações de manejo pesqueiro são urgentemente necessárias. Talvez, a regulamentação do esforço de pesca seja a única atitude imediata aplicável e com chances de ser eficiente.

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“…The total body length of the captured dolphins varied from 166 to 250cm. Cases of incidental mortality have been reported principally in the north of the study area where passive gillnet fisheries have a negative impact on coastal dolphins (Di Beneditto, 2003;Moura et al, 2009a). It is important to highlight that some carcasses could have stranded as a result of entanglement, but the decomposition stage of the carcasses prevented such observations.…”

Section: Resultsmentioning

confidence: 99%

Bottlenose dolphins (Tursiops truncatus, Montagu 1821) in central-northern coast of Rio de Janeiro State, Brazil: stranding patterns and insights into feeding habits

Moura¹,

Tavares

Secco

et al. 2017

Lat. Am. J. Aquat. Mamm.

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The bottlenose dolphin (Tursiops truncatus) may be one of the best known dolphin species worldwide, principally due to its coastal distribution in many regions. However, few studies about ecology, biology and threats have been conducted on the Brazilian coast. The aim of the present work is to analyze the stranding pattern and stomach contents of bottlenose dolphins in the central-north coast of the Rio de Janeiro State, from Saquarema to São Francisco de Itabapoana (~300km of coast line). Forty nine stranding events were recorded through regular beach surveys from 1999 to 2012 and also through access to previous published studies conducted since 1984. The strandings were distributed throughout the study area, but there was a trend of occurrence in the extreme southern and northern regions. Nine specimens showed evidence of accidental mortality in fishing nets. The strandings were more frequently recorded during autumn and winter (χ2; p < 0.05). Male bottlenose dolphins stranded more often than females, showing significant differences in this relationship (χ2; p < 0.05). Most stranded dolphins were classified as adults (> 230cm of body length) (χ2; p < 0.05). The body length varied from 106 to 335cm. Four prey species were found in the stomach contents from the three specimens of bottlenose dolphin analyzed. The most representative prey species was the cutlassfish (Trichiurus lepturus). This study showed that bottlenose dolphins are frequently found dead along the Rio de Janeiro State where they feed mainly on coastal fish. Future studies need to be conducted to improve the knowledge on this poorly known cetacean in Brazil.

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Interactions between gillnet fisheries and small cetaceans in northern Rio de Janeiro, Brazil: 2001-2002

Cited by 49 publications

References 8 publications

Distribution and habitat characteristics of dolphins of the genus Stenella (Cetacea: Delphinidae) in the southwest Atlantic Ocean

Distribution and habitat characteristics of dolphins of the genus Stenella (Cetacea: Delphinidae) in the southwest Atlantic Ocean

Incidental catches of franciscana in coastal gillnet fisheries in the Franciscana Management Area III: period 1999-2000

Bottlenose dolphins (Tursiops truncatus, Montagu 1821) in central-northern coast of Rio de Janeiro State, Brazil: stranding patterns and insights into feeding habits

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