Descrição
Two silver (migratory) male freshwater eels, Anguilla dieffenbachii, were caught in a commercial trawl net in the South Taranaki Bight in April 2014. The capture date and the relatively small eye size indicated that both eels had probably only recently entered the sea. This is the first record of male A. dieffenbachii caught at sea, en route to the presumed spawning area in the South Fiji Basin
Registros de Dados
Os dados deste recurso de evento de amostragem foram publicados como um Darwin Core Archive (DwC-A), que é o formato padronizado para compartilhamento de dados de biodiversidade como um conjunto de uma ou mais tabelas de dados. A tabela de dados do núcleo contém 1 registros.
Também existem 2 tabelas de dados de extensão. Um registro de extensão fornece informações adicionais sobre um registro do núcleo. O número de registros em cada tabela de dados de extensão é ilustrado abaixo.
This IPT archives the data and thus serves as the data repository. The data and resource metadata are available for download in the downloads section. The versions table lists other versions of the resource that have been made publicly available and allows tracking changes made to the resource over time.
Versões
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Como citar
Pesquisadores deveriam citar esta obra da seguinte maneira:
Jellyman D J, Stewart A (2024). First record of male freshwater eels (Anguilla dieffenbachii) caught at sea. Version 1.2. The National Institute of Water and Atmospheric Research (NIWA). Samplingevent dataset. https://nzobisipt.niwa.co.nz/resource?r=nz_male_anguilla_at_sea&v=1.2
Direitos
Pesquisadores devem respeitar a seguinte declaração de direitos:
O editor e o detentor dos direitos deste trabalho é The National Institute of Water and Atmospheric Research (NIWA). This work is licensed under a Creative Commons Attribution (CC-BY 4.0) License.
GBIF Registration
Este recurso foi registrado no GBIF e atribuído ao seguinte GBIF UUID: c16b2618-357a-478c-963c-63ee380f1e80. The National Institute of Water and Atmospheric Research (NIWA) publica este recurso, e está registrado no GBIF como um publicador de dados aprovado por GBIF New Zealand.
Palavras-chave
Samplingevent
Contatos
- Provedor Dos Metadados ●
- Originador ●
- Ponto De Contato
- Researcher
- Originador
- Researcher
Cobertura Geográfica
South Taranaki Bight, New Zealand
Coordenadas delimitadoras | Sul Oeste [-40,4, 174,45], Norte Leste [-40,3, 174,55] |
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Cobertura Taxonômica
New Zealand Longfin Eel
Espécie | Anguilla dieffenbachii (New Zealand longfin eel, ōrea) |
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Cobertura Temporal
Data Inicial / Data final | 2014-04-21 / 2014-04-22 |
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Métodos de Amostragem
On 22 April 2014, two A. dieffenbachii were caught in the D'Urville Sea Valley, South Taranaki Bight, by a commercial trawler; the centroid of the trawl shot, 40 22’S, 174 03E, was 36 km NNE of Stephens Island (Marlborough Sounds), and 98 km West of Foxton Beach. The trawl (116 m opening, 60 m height, 108 mm codend mesh) was deployed at 2140 h on 21 April and retrieved at 0600 h the following day. The average bottom depth was 122 m, but as the trawl fished mid-water, the actual depth of capture is uncertain. The eels were noticed by Ministry for Primary Industries onboard observers who froze them prior to forwarding to the Museum of New Zealand, Te Papa Tongarewa, for confirmation of identification.
Área de Estudo | South Taranaki Bight |
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Descrição dos passos do método:
- When thawed, one eel measured 608 mm TL and 474 g, and the second 648 mm (but was not weighed). Both eels were identified as A. dieffenbachii from external features (body shape, colour, insertion and length of the dorsal fin and pattern of vomerine teeth), while examination of the gonads confirmed they were males. As they were catalogued as museum specimens, it was not permitted to make incisions and remove both testes, so no gonadosomatic index could be calculated. The eye indices (vertical x horizontal diameter; Todd Citation1981b) were 9.36 and 9.88 mm2 respectively; the average index for silver longfin male eels of similar lengths at the start of their seaward migration would be 9.2 and 10.26 mm2 respectively (calculated from the eye index/total length relationship given by Todd (Citation1981b)).
Citações bibliográficas
- Don J. Jellyman & Andrew I. Stewart (2019) First record of male freshwater eels (Anguilla dieffenbachii) caught at sea, New Zealand Journal of Marine and Freshwater Research, 53:2, 288-291 DOI: 10.1080/00288330.2018.1550792
Metadados Adicionais
marine, harvested by iOBIS
Identificadores alternativos | c16b2618-357a-478c-963c-63ee380f1e80 |
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https://nzobisipt.niwa.co.nz/resource?r=nz_male_anguilla_at_sea |