Standardized Methods for Measuring and Recording Data on the Smaller Cetaceans

Norris, Kenneth S.

doi:10.2307/1377364

Cited by 232 publications

(126 citation statements)

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“…Information collected in each stranding event included: stranding location (with geographic coordinates), total length [in cm, according to Norris (1961)] and sex of the animal. Information on anthropogenic interactions, such as net marks, stab wounds or removal of meat, eyes and teeth were also collected in some regions.…”

Section: Methodsmentioning

confidence: 99%

Reports of strandings and sightings of bottlenose dolphins (Tursiops truncatus) in northeastern Brazil and Brazilian oceanic islands

Meirelles

Campos

Marcondes

et al. 2017

Lat. Am. J. Aquat. Mamm.

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This study revises and updates information on bottlenose dolphin Tursiops truncatusstrandings and sightings in northeastern Brazil. A total of 72 strandings were recorded from 1992 to 2010, and 51 sightings were recorded from 1988 to 2010 along the states from Ceará to Bahia, including Fernando de Noronha and São Pedro and São Paulo archipelagos, Rocas Atoll and Abrolhos Bank. Most strandings were recorded in the states of Pernambuco, Bahia and Rio Grande do Norte. The number of reports was higher during summer, but no statistically significant difference was found between summer and other seasons. The majority of the stranded animals were adults (70.6%). Stranded calves were not observed. Total body length ranged from 138 to 321cm: 138 to 310cm for males; and 168 to 288cm for females. The average adult body length was 281cm (SD = 0.22). For stranding events where sex was determined (n = 29), a highly statistically significant difference was found between the number of males (n = 21) and females (n = 8). A total of six animals (8.3%) showed evidence of fisheries interactions such as net marks or removal of meat, blubber and eyes. Twenty-two sightings were recorded in the northeastern region, mostly in small islands and Rocas Atoll. This finding shows that the bottlenose dolphin is mainly an oceanic species in the region. More efforts are needed to improve our understanding of the populations and conservation status of bottlenose dolphins in this region.

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Section: Methodsmentioning

confidence: 99%

Reports of strandings and sightings of bottlenose dolphins (Tursiops truncatus) in northeastern Brazil and Brazilian oceanic islands

Meirelles

Campos

Marcondes

et al. 2017

Lat. Am. J. Aquat. Mamm.

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“…Therefore the number of franciscana catches recorded in this study is considered absolute for the area and period the fishery was monitored. Franciscana specimens collected were measured, dissected and sampled according to Norris (1961) and to Geraci and Lounsbury (1993). Biological samples (gonads, stomachs, teeth, skeleton, and tissue for genetic, contaminant and histopathology analysis) were deposited at the Instituto de Biociências, Faculdade de Medicina Veterinária and Museu de Zoologia, Universidade de São Paulo.…”

Section: Fishery Monitoringmentioning

confidence: 99%

Incidental mortality of franciscana (<i>Pontoporia blainvillei</i>) in the artisanal fishery of Praia Grande, São Paulo State, Brazil

Bertozzi¹,

Zerbini²

2002

Lat. Am. J. Aquat. Mamm.

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-The artisanal fishery in Praia Grande, São Paulo State, southeastern Brazil, was monitored between August 1998 and June 2001 through interviews with fishermen and onboard observations. The objective was to describe the fleet, the gear and the fishing activities, and to monitor the bycatch of small cetaceans. The Praia Grande fishing community has 20 fishermen who operate five aluminum and one wooden open boat. Seven types of gillnet and one beach seine net are used. Nets are made of nylon monofilament; net length and height range from 60-1800m and 1.5-10m, respectively. Mesh sizes vary from 7-30cm. Each type of net is set up according to target species and weather conditions. Fish of the families Sciaenidae, Carangidae, Carcharhinidae, Trichiuridae and Ariidae are the main species captured. The incidental mortality of 31 franciscanas was recorded. Thirteen specimens were collected: 8 males (106-122cm) and 5 females (71-134cm). Captures took place in depths of up to 20m and along 31km of the coast. Catch per unit of effort for the period July 1999-June 2001 indicated a higher mortality in autumn and in gillnets with 14cm stretched mesh size (malha 14) Three franciscanas were captured and released alive from beach seine nets. Several fishing communities with similar operational methods along the southeastern coast of Brazil remain unmonitored. This suggests that franciscana mortality may be substantial on a regional basis and emphasizes the urgency of systematic monitoring. Resumo -A frota pesqueira artesanal da Praia Grande, litoral central do Estado de São Paulo, sudeste do Brasil, foi monitorada entre agosto de 1998 e junho de 2001 através de entrevistas com pescadores e observações à bordo. O objetivo foi descrever a frota, as artes de pesca, a atividade pesqueira e monitorar a captura acidental de pequenos cetáceos. A comunidade pesqueira de Praia Grande possui 20 pescadores que operam cinco lanchas de alumínio e uma canoa de madeira. Sete tipos de redes de espera e um tipo de rede de arrasto de praia são utilizadas. As redes são confeccionadas com nylon monofilamento; o comprimento e altura das redes varia de 60-1800m e 1.5-10m, respectivamente. O tamanho das malhas varia de 7 a 30cm. A utilização de cada tipo de rede varia de acordo com a espécie alvo e condições meteorológicas. Peixes das famílias Sciaenidae, Carangidae, Carcharhinidae, Trichiuridae e Ariidae são as principais espécies capturadas. A mortalidade acidental de 31 toninhas foi registrada. Treze espécimes foram coletados: 8 machos (106-122cm) e 5 fêmeas (71-134cm). As capturas ocorrem a profundidades máximas de 20m e ao longo de 31km da costa. A captura por unidade de esforço de pesca do período julho 1999-junho 2001 indicou uma maior mortalidade no outono em redes de espera de fundo com malha de 14cm entre nós esticados (malha 14). Três toninhas foram capturadas e liberadas vivas em rede de arrasto de praia. Existem diversas pequenas comunidades pesqueiras não monitoradas com métodos operacionais similares ao longo da costa Sudeste d...

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“…It appeared to have lost condition, being somewhat emaciated posterior to the dorsal fin: further details of its pathology will not be discussed here. External measurements were taken with a fibreglass tape according to the protocol of Norris (1961). A skin sample for genetics was taken within an hour of death and fixed in 70% ethyl alcohol.…”

Section: Introductionmentioning

confidence: 99%

Confirmation of the occurrence of a second killer whale morphotype in South African waters

Best

Meÿer

Kotze

et al. 2014

African Journal of Marine Science

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Standardized Methods for Measuring and Recording Data on the Smaller Cetaceans

Cited by 232 publications

References 0 publications

Reports of strandings and sightings of bottlenose dolphins (Tursiops truncatus) in northeastern Brazil and Brazilian oceanic islands

Reports of strandings and sightings of bottlenose dolphins (Tursiops truncatus) in northeastern Brazil and Brazilian oceanic islands

Incidental mortality of franciscana (<i>Pontoporia blainvillei</i>) in the artisanal fishery of Praia Grande, São Paulo State, Brazil

Confirmation of the occurrence of a second killer whale morphotype in South African waters

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