Age determination and growth of yellow eels, Anguilla anguilla (L.), from a brackish water, Norway

Abstract The aim of the study was to examine metazoans parasite communities of European eels (Anguilla anguilla) in freshwater (Tonga Lake) and brackish water (El Mellah lagoon) in the northeast of Algeria. Six parasite taxa were collected: one monogenean, Pseudodactylogyrus sp.; two crustaceans, Ergasilus sp. and Argulus foliaceus; two nematodes, Cucullanus sp. and Anguillicola crassus; one cestode, Bothriocephalus claviceps. Th e most prevalent parasite taxa in freshwater were Pseudodactylogyrus sp., A. crassus and Bothriocephalus claviceps; whereas in the brackish water, eels were infected mainly with A. crassus. Th e characteristics of the parasite component community structure revealed low parasite species diversity and high dominance values in eels from the two localities. Both communities were dominated by a single parasite species: Tonga eels by the monogenean Pseudodactylogyrus sp. and El Mellah lagoon eels by the nematode A. crassus, verified by high Berger-Parker dominance values of 0.76 and 0.87 respectively.

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Age determination of eels, Anguilla anguilla (L): comparison of field data with otolith ring patterns

Journal of Fish Biology ◽

10.1111/j.1095-8649.1985.tb04294.x ◽

1985 ◽

Vol 26 (5) ◽

pp. 537-544 ◽

Cited By ~ 31

Author(s):

R. Berg

Keyword(s):

Field Data ◽

Age Determination ◽

Anguilla Anguilla

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Shell growth and age determination of the brackish water bivalve Corbicula japonica in Lake Shinji, Japan

Fisheries Science ◽

10.1111/j.1444-2906.2004.00847.x ◽

2004 ◽

Vol 70 (4) ◽

pp. 601-610 ◽

Cited By ~ 13

Author(s):

Kazuhiro OSHIMA ◽

Naoki SUZUKI ◽

Mikio NAKAMURA ◽

Kazumi SAKURAMOTO

Keyword(s):

Brackish Water ◽

Shell Growth ◽

Age Determination ◽

Corbicula Japonica ◽

Lake Shinji

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Ecological plasticity of the European eel Anguilla anguilla in a tidal Atlantic lake system in Ireland

Journal of the Marine Biological Association of the United Kingdom ◽

10.1017/s0025315419000031 ◽

2019 ◽

Vol 99 (5) ◽

pp. 1189-1195 ◽

Cited By ~ 6

Author(s):

Takaomi Arai ◽

Aya Kotake ◽

Chris Harrod ◽

Michelle Morrissey ◽

T. Kieran McCarthy

Keyword(s):

Fresh Water ◽

Growth Phase ◽

Brackish Water ◽

Habitat Preference ◽

Salinity Gradient ◽

Anguilla Anguilla ◽

European Eel ◽

Ecological Plasticity ◽

Lake System ◽

Freshwater Habitats

AbstractRecent studies have shown that anguillid eel populations in habitats spanning the marine–freshwater ecotone can display extreme plasticity in the range of catadromy expressed by individual fish. The apparent use of marine and freshwater habitats by the European eel Anguilla anguilla was examined by analysing the strontium (Sr) and calcium (Ca) concentrations in otoliths of eels collected from a tidal Atlantic lake system in Ireland. Variations of the Sr:Ca ratio in the otoliths indicated that a variety of environmental salinities had been experienced in the habitats that were occupied during the growth phase of these individuals in the tidal Atlantic lake system. The otolith microchemistry of these eels indicated that most of the eels had entered each salinity environment (freshwater (FW); brackish water (BW); marine-dominated water (MW) and full seawater (SW)) from fresh water to full seawater just after recruitment and had stayed in each environment until maturation without movement to other salinity environments. Only 2 of 93 (2%) eels had shifted their habitat once in their lives. This result suggests that each individual might have an environmental habitat preference, although each individual could move along a short (<2 km) salinity gradient.

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