Estimation of roach (Rutilus rutilus (L.)) and smelt (Osmerus eperlanus (L.)) stocks with virtual population analysis, hydroacoustics and gillnet CPUE

Peltonen, Heikki; Ruuhijärvi, Jukka; Malinen, Tommi; Horppila, Jukka

doi:10.1016/s0165-7836(99)00057-0

Cited by 47 publications

(40 citation statements)

References 34 publications

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“…However, the correlation between the CPUE from gillnets and abundance based on other sampling techniques, such as active fishing gear or echo-sounding, has not always been confirmed (Hansson and Rudstam, 1995;Peltonen et al, 1999). Within the framework of lake monitoring, the definition of lake quality is based on an assessment of the relative abundances of fish species, for which the CEN standard provides an estimate through the calculation of the CPUE.…”

Section: Figure 1 Mean Total Estimates Of Weight (Wpue ± Std) and Nummentioning

confidence: 99%

“…To achieve the same degree of accuracy of the estimates of abundances as in benthic nets, Degerman et al (1988) argue that on average 16 pelagic nets are needed per stratum instead of the two recommended by the CEN Standard. Some authors have revealed no correlation between gillnet catches and hydroacoustic data because of the catchability bias introduced by passive gears into abundance estimates (Hansson and Rudstam, 1995;Peltonen et al, 1999), particularly as the sample units were not similar over space and time.…”

Section: Figure 1 Mean Total Estimates Of Weight (Wpue ± Std) and Nummentioning

confidence: 99%

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Assessment of the pelagic fish populations using CEN multi-mesh gillnets: consequences for the characterization of the fish communities

Deceliere-Vergès¹,

Guillard²

2008

Knowl. Managt. Aquatic Ecosyst.

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The contribution of CEN standard pelagic nets to the assessment of fish communities is tested by comparing three metrics (species composition, species abundance, and size structures) measured in accordance with the standard (i.e. using benthic nets only) to those calculated from the total effort (i.e. including pelagic nets). Hydroacoustic surveys were used simultaneously to assess fish densities in the pelagic habitat. The results show that in most cases the pelagic nets did not provide any extra information about these three metrics. However, their inclusion in the calculation of CPUE and size structures may affect the picture of the fish communities, especially in lakes containing salmonid populations. This study highlights the need to sample pelagic fish when assessing fish communities in order to determine lake quality. RÉSUMÉ L'évaluation des populations de poissons pélagiques par les filets multi-mailles CEN : conséquences pour la caractérisation du peuplement La contribution des filets pélagiques du standard CEN dans l'évaluation des peuplements piscicoles est testée en comparant les métriques (composition et abondance spécifiques, structures en tailles) mesurées conformément au standard (i.e. les filets benthiques seuls), à celles issues de l'effort total (i.e. incluant les filets pélagiques). L'hydroacoustique a été utilisée simultanément pour évaluer les densités de poissons dans l'habitat pélagique. Les résultats montrent que dans la plupart des cas, les filets pélagiques n'apportent pas d'informations supplémen-taires sur les trois métriques. Toutefois, leur intégration dans le calcul des CPUE et des structures en tailles peut modifier l'image des peuplements notamment dans les lacs à salmonidés. Ce travail met en évidence la nécessité d'échantillonner les poissons pélagiques pour l'évaluation des peuplements en vue de définir la qualité du milieu.(1) ASCONIT Consultants, 6-8 Espace Henry Vallée,

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Section: Figure 1 Mean Total Estimates Of Weight (Wpue ± Std) and Nummentioning

confidence: 99%

Section: Figure 1 Mean Total Estimates Of Weight (Wpue ± Std) and Nummentioning

confidence: 99%

Assessment of the pelagic fish populations using CEN multi-mesh gillnets: consequences for the characterization of the fish communities

Deceliere-Vergès¹,

Guillard²

2008

Knowl. Managt. Aquatic Ecosyst.

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“…Monitoring the CPUE does not provide a good estimate of absolute fish densities but, instead, information on proportional changes in the exploited populations, i.e., selective estimates (Peltonen et al, 1999). Temporal variations in CPUE for S. nasutus were clear, both for number and biomass.…”

Section: Discussionmentioning

confidence: 97%

Catch and selectivity parameters of the anastomid fishSchizodon nasutususing gillnets in the Jurumirim reservoir (São Paulo, Brazil)

García-Mellado¹,

Oliva‐Paterna²,

Carvalho³

et al. 2002

Italian Journal of Zoology

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Catch and selectivity parameters using gillnets were calculated for Schizodon nasutus in the Jurumirim reservoir on the Paranapanema River in southern Brazil. The simple gillnets used were made of monofilament nylon of 30 to 140 mm mesh size and of different heights. The relative abundance of the S. nasutus caught was analysed monthly and a positive relationship was found between catches per unit effort in number and biomass. The relative catches were more abundant for the nets of 40 and 50 mm mesh size. Catches were characterized by clear temporal variations and a predominance of medium size fish throughout the study period. The selectivity curve of gillnets for S. nasutus in this ecosystem was obtained. The catch obtained was compared with the available catch for each mesh size, and the available catch for a certain length of fish was calculated starting from the theoretical selectivity curve. The 50 mm mesh size gillnet showed the best fit between real and available captures and was considered the most suitable, because a smaller mesh size resulted in a catch of predominantly immature specimens. It is expected that these results will contribute to improving management strategies for conservation of resources. Parameters such as the minimum catch length advisable or the mesh size permitted for a given species are indispensable for such decision-making.

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“…We used the contribution (%) of a species to the total catch in gillnet surveys to allocate the relative proportion of species in the acoustic surveys, as described previously [39,40]. However, the distribution of fish length in the acoustic surveys disagreed with that of the fish caught at the lowest possible TS threshold (60 dB re 1 m 2 ) (Figure 3).…”

Section: Accuracy Of Datamentioning

confidence: 99%

Spatiotemporal patterns of the fish assemblages downstream of the Gezhouba Dam on the Yangtze River

Tao¹,

Gong²,

Tan

et al. 2012

Sci. China Life Sci.

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An explicit demonstration of the changes in fish assemblages is required to reveal the influence of damming on fish species. However, information from which to draw general conclusions regarding changes in fish assemblages is insufficient because of the limitations of available approaches. We used a combination of acoustic surveys, gillnet sampling, and geostatistical simulations to document the spatiotemporal variations in the fish assemblages downstream of the Gezhouba Dam, before and after the third impoundment of Three Gorges Reservoir (TGR). To conduct a hydroacoustic identification of individual species, we matched the size distributions of the fishes captured by gillnet with those of the acoustic surveys. An optimum threshold of target strength of 50 dB re 1 m 2 was defined, and acoustic surveys were purposefully extended to the selected fish assemblages (i.e., endemic Coreius species) that was acquired by the size and species selectivity of the gillnet sampling. The relative proportion of fish species in acoustic surveys was allocated based on the composition (%) of the harvest in the gillnet surveys. Geostatistical simulations were likewise used to generate spatial patterns of fish distribution, and to determine the absolute abundance of the selected fish assemblages. We observed both the species composition and the spatial distribution of the selected fish assemblages changed significantly after implementation of new flow regulation in the TGR, wherein an immediate sharp population decline in the Coreius occurred. Our results strongly suggested that the new flow regulation in the TGR impoundment adversely affected downstream fish species, particularly the endemic Coreius species. To determine the factors responsible for the decline, we associated the variation in the fish assemblage patterns with changes in the environment and determined that substrate erosion resulting from trapping practices in the TGR likely played a key role.

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Estimation of roach (Rutilus rutilus (L.)) and smelt (Osmerus eperlanus (L.)) stocks with virtual population analysis, hydroacoustics and gillnet CPUE

Cited by 47 publications

References 34 publications

Assessment of the pelagic fish populations using CEN multi-mesh gillnets: consequences for the characterization of the fish communities

Assessment of the pelagic fish populations using CEN multi-mesh gillnets: consequences for the characterization of the fish communities

Catch and selectivity parameters of the anastomid fishSchizodon nasutususing gillnets in the Jurumirim reservoir (São Paulo, Brazil)

Spatiotemporal patterns of the fish assemblages downstream of the Gezhouba Dam on the Yangtze River

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