Density and biomass of smelt (Osmerus eperlanus) in five Finnish lakes

Jurvelius, Juha; Auvinen, Heikki; Kolari, Irma; Marjomäki, Timo J.

doi:10.1016/j.fishres.2005.01.016

Cited by 17 publications

(25 citation statements)

References 21 publications

(26 reference statements)

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“…Krueger and Hrabik (2005) also found that biomass of cisco in two Wisconsin lakes to be higher than observed in this study (Fence Lake 23 kg ha −1 and Crawling Stone Lake 85.5 kg ha −1 ). Biomass of coregonids in the present study was high compared to the five lakes in Finland (range ca., 0.1-8.2 kg ha −1 ) that support sympatric vendace and smelt populations (Jurvelius et al, 2005). Total coregonid densities in the western arm during 2006 (247 fish ha −1 ) were within the range found in the three Swedish lakes (117-349 fish ha −1 ) reported by Nyberg et al (2001) that also supported both vendace and smelt populations.…”

Section: Discussionsupporting

confidence: 61%

“…Acoustic surveys to estimate fish abundance have become more common as technology has improved. Such surveys have been used to assess populations (Nyberg et al, 2001;Jurvelius et al, 2005;Schmidt et al, 2005) and their trajectories (Auvinen and Jurvelius, 1994;Hampton, 1996;Thomas and Thorne, 2003), to conduct predator demand versus prey supply (D-S) studies (Goyke and Brandt, 1993;Mason et al, 2005;Sigler and Csepp, 2007), to evaluate and refine commercial harvest quotas (Thorne et al, 1983;Thomas and Thorne, 2003;Schreiner et al, 2006), and to map distribution patterns (Heist and Swenson, 1983;Lawson and Rose, 2000;Stokesbury et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

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Can pelagic forage fish and spawning cisco (Coregonus artedi) biomass in the western arm of Lake Superior be assessed with a single summer survey?

et al. 2009

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Section: Discussionsupporting

confidence: 61%

Section: Introductionmentioning

confidence: 99%

Can pelagic forage fish and spawning cisco (Coregonus artedi) biomass in the western arm of Lake Superior be assessed with a single summer survey?

et al. 2009

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“…When the TS distribution is bimodal we presented the higher mode value. Predicted total fish length (L) was obtained with the formula of Love (1977) in vertical beaming and standard length (SL) with the all aspects and all species equation of Kubecka and Duncan (1998) in horizontal beaming SED (Yule 2000;Jurvelius et al 2005) instead of -70 dB after filtering, small echoes with fish-like characteristics would have been removed. In fact, some targets with few detections would have been eliminated altogether with the selected tracking parameters used (Fig.…”

Section: Discussionmentioning

confidence: 99%

Hydroacoustic fish biomass assessment in man-made lakes in Tunisia: horizontal beaming importance and diel effect

Djemali

Toujani

Guillard³

2008

Aquat Ecol

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We used a Simrad EK60 echosounder equipped with two split-beam transducers to develop a sampling strategy for assessing fish resources in Tunisian man-made lakes. Day and night surveys, using vertical and horizontal beaming, were carried out between December 2006 and February 2007, a period when fish catchability is high. Four reservoirs with differing surface areas and bathymetries were selected. Echogram analysis revealed that fish communities were mainly composed of individual targets. A few schools were detected near the surface during daylight, but these schools dispersed slightly at night. In these multispecies reservoirs, considerable day and night differences in density existed, but with no clear trend. Target strength (TS) distribution mode values detected at night were always lower or equal to daytime values. Biomass estimates were significantly higher during daytime in three reservoirs, corresponding with higher TS modal values. In the other reservoir, the biomass estimate was significantly higher during nighttime corresponding with higher mean density during this period. Using only a vertically aimed transducer in our study reservoirs would have led to an underestimate of density and biomass by 5-100% and 20-100%, respectively, depending on the man-made lake. We conclude that acoustic sampling in our reservoirs must be done during day and night and that both vertical and horizontal beaming must be used to obtain the best possible picture of the fish stocks.

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“…and perch (Perca fluviatilis (L.)) are the most common species in the pelagic area of the lake (e.g. Jurvelius et al, 2005).…”

Section: Study Areamentioning

confidence: 99%

Quality and status of fish stocks in lakes: gillnetting, seining, trawling and hydroacoustics as sampling methods

Jurvelius¹,

Kolari²,

Leskelä³

2010

Hydrobiologia

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All sampling methods give selective or biased estimates of fish species abundance, distribution and size structure. This creates problems, e.g. in regard to the Water Framework Directive of the European Union, which demands evaluation of the quality and status of fish stocks in lakes. We compared fish sampling by means of Nordic multimesh gillnets, seining, trawling and hydroacoustics in two Finnish lakes in summer 2007 and 2008. Sampling methods were used 'as such', i.e. no special design was implemented for method comparison. In the shallow eutrophicated lake the species' composition of gillnet sampling and seining were very different. The biomass-% of percids dropped from gillnet (61%) to seining (9%) and that of cyprinids grew from 39 to 90%, respectively. In the deep pelagic area of the oligotrophic lake, vendace and smelt predominated in trawl catches. The number of fish caught by gillnetting in that area was too small to make any conclusions about the species composition. In the eutrophicated lake, the combined length distribution for all fish species differed significantly between gillnetting and seining. In the oligotrophic lake, the gillnet catches were too small for any comparison of fish size. The difference in the length distribution of fish between trawl and echosounding was significant in most analysed depth layers. In upper depth layers acoustics sampled larger fish than trawling, and in deeper layers smaller fish. Using a combined acoustic-trawl method, the pelagic fish biomass was estimated to be approx. 17 kg ha -1 in the deep and oligotrophic lake. We conclude that in large and deep-water areas, the use of active gear is enough in fish sampling to evaluate the quality and status of fish stocks. Gillnetting together with seining is an appropriate method to work out the quality and status of fish stocks in shallow and littoral areas of large lakes. Variation in the catch selectivity of fish sampling gear requires a discrete ecological classification for each type of gear.

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Density and biomass of smelt (Osmerus eperlanus) in five Finnish lakes

Cited by 17 publications

References 21 publications

Can pelagic forage fish and spawning cisco (Coregonus artedi) biomass in the western arm of Lake Superior be assessed with a single summer survey?

Can pelagic forage fish and spawning cisco (Coregonus artedi) biomass in the western arm of Lake Superior be assessed with a single summer survey?

Hydroacoustic fish biomass assessment in man-made lakes in Tunisia: horizontal beaming importance and diel effect

Quality and status of fish stocks in lakes: gillnetting, seining, trawling and hydroacoustics as sampling methods

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