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| Tessier, Anne; Blin, Charlotte; Cottet, Maud; Kue, Kaoboun; Panfili, Jacques; Chanudet, Vincent; Descloux, Stephane; Guillard, Jean. |
| Biological traits of Oreochromis niloticus were studied in order to identify potential differences between the population of the Nam Theun 2 Reservoir and other populations in Asia and in Africa. The study also aimed to characterize the demographic structure of the exploited population by fisheries in the reservoir. Toluidine-stained transverse section of otoliths from 322 specimens, collected between November 2015 and January 2017, were analysed to identify the periodicity of annulus formation and to age individuals. Length, weight, sex and sexual maturity stage were recorded. Life history traits were characterized by length-weight and length age relationships. The periodicity of annulus formation was annual, with complete formation of the translucent... |
| Tipo: Text |
Palavras-chave: Otolith; Man-made Lake; South-East Asia; Fisheries. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00626/73771/75176.pdf |
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| Mouget, Anne; Goulon, Chloé; Axenrot, Thomas; Balk, Helge; Lebourges-dhaussy, Anne; Godlewska, Malgorzata; Guillard, Jean. |
| Hydroacoustics has become a requisite method to assess fish populations and allows to describe the relationships of fish with other elements of the aquatic ecosystem. This nonintrusive method is currently an integral part of the sampling procedures recommended for fish stock assessment by the Water Framework Directive and has been standardized by the European Committee for Standardization [CEN (2014) CSN EN 15910 ‐ Water quality ‐ Guidance on the estimation of fish abundance with mobile hydroacoustic methods, Category: 7577 Water quality. Biological.]. In Europe, hydroacoustic surveys are performed in freshwater using different frequencies. Consequently, there is a need to evaluate if survey results can be compared. This study aimed to carry out in situ... |
| Tipo: Text |
Palavras-chave: Fisheries acoustics; Frequencies comparison; Freshwater; Hydroacoustics; Lake; Standardization. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00484/59605/62619.pdf |
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| Guillard, Jean; Brehmer, Patrice; Colon, Michel; Guennegan, Yvon. |
| Fish schools are aggregative structures encountered in all types of aquatic environments but have as yet been little studied in freshwaters except at small spatial scales. This study represents the three dimensional description of juvenile fish schools (Perca fluviatilis and Rutilus rutilus) in a lake environment using high resolution multibeam sonar system operating at a frequency of 455 kHz, composed of 60 beams of 1.5 degrees allowing a 90 degrees observation plane. The in situ diurnal schooling behaviour of young-of-the-year fish of both species is confirmed. The morphological, energetic and spatial variables of these schools are described and related to one another. The structures described are of the same order of magnitude as those described in the... |
| Tipo: Text |
Palavras-chave: Annecy Lake; Rutilus rutilus; Perca fluviatilis; Sonar; 3 D structure; Shoaling behaviour. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-1661.pdf |
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