Comparative use of vendace by humans and Saimaa ringed seal in Lake Pihlajavesi, Finland

Auvinen, Heikki; Jurvelius, Juha; Koskela, Jouni; Sipilä, Tero

doi:10.1016/j.biocon.2005.04.008

Cited by 6 publications

(3 citation statements)

References 30 publications

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“…, Sipilä , Auvinen et al . ). The conventional assumption is that the Saimaa ringed seal's primary prey is vendace (Hyvärinen et al .…”

Section: Discussionmentioning

confidence: 97%

“…, Sipilä and Hyvärinen , Auvinen et al . ), which is the most commercially valuable fish species in the inland waters of eastern Finland (Finnish Game and Fisheries Research Institute ). During an earlier diet study (Kunnasranta et al .…”

Section: Discussionmentioning

confidence: 99%

“…In previous centuries, local people have considered the seals to be competitors with fisheries (Auvinen et al . ) and nowadays skeptical attitudes have been expressed towards the extension of fishing restrictions related to seal conservation in Lake Saimaa (Salmi et al . , Salmi and Muje , Tonder and Jurvelius , Tonder and Salmi ).…”

mentioning

confidence: 99%

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Diet composition and seasonal feeding patterns of a freshwater ringed seal (Pusa hispida saimensis)

Auttila

Sinisalo

Valtonen

et al. 2014

Marine Mammal Science

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Diet composition and seasonal feeding patterns of a freshwater ringed seal (Pusa hispida saimensis) Auttila, Miina; Sinisalo, Tuula; Valtonen, Mia; Niemi, Marja; Viljanen, Markku; Kurkilahti, Mika; Kunnasranta, Mervi Auttila, M., Sinisalo, T., Valtonen, M., Niemi, M., Viljanen, M., Kurkilahti, M., & Kunnasranta, M. (2015). Diet composition and seasonal feeding patterns of a freshwater ringed seal (Pusa hispida saimensis). Marine Mammal Science, 31 (1) AbstractThe Saimaa ringed seal (Pusa hispida saimensis) is one of the few freshwater seal populations worldwide. The major conservation issue of this critically endangered population is bycatch mortality. We used digestive tract content and stable isotopes (d N values indicated that pups start to recover from postweaning stress and gain weight around the age of 6 mo. The isotope values differed regionally, which emphasizes that samples from consumers and prey should be collected from the same regions to improve interpretation of the stable isotopic results. Overall, diet composition suggests minimal to nonexistent competition with commercial or recreational fishing. However, observed weight loss of pups during summer may be related to higher risk of bycatch and this should be taken into account when planning temporal fishing closures.

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“…, Sipilä , Auvinen et al . ). The conventional assumption is that the Saimaa ringed seal's primary prey is vendace (Hyvärinen et al .…”

Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Diet composition and seasonal feeding patterns of a freshwater ringed seal (Pusa hispida saimensis)

Auttila

Sinisalo

Valtonen

et al. 2014

Marine Mammal Science

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Fish density and target strength distribution of single fish echoes in varying light conditions with single and split beam echosounding and trawling

Jurvelius¹,

Marjomäki

Peltonen

et al. 2016

Hydrobiologia

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To evaluate the consistency of mobile and vertical echosounding results from the 1980s to the 2000s, fish density (fish ha -1 ) and target strength (TS, dB) estimates of single (70 and 200 kHz) and split (38 and 120 kHz) beam echo sounders were compared under varying light conditions. Acoustic estimates were compared with trawling results. During daytime hauls, the catch per swept area (CSA) of vendace and smelt were high at 10-15 m depth and low at 15-30 m depth. Around sunset, vendace and to some degree also smelt were concentrated at some meters above the thermocline. Around midnight, the CSA showed that smelt occupied higher water layers than vendace. Under different light conditions, both single and split beam echo sounders were in good agreement regarding the general level of fish density. In dusk and darkness, density estimates from echosounding and trawling as well as the TS-distribution between the single and split beam sounders were more consistent than those in daylight. We conclude that in boreal lakes single and split beam echosoundings outline, in comparable light conditions, consistent time series from the 1980s up to the year 2010. Darkness gives the best condition for estimating fish density and acoustic fish size.

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Sealed in a lake — Biology and conservation of the endangered Saimaa ringed seal: A review

Kunnasranta

Niemi

Auttila

et al. 2021

Biological Conservation

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Comparative use of vendace by humans and Saimaa ringed seal in Lake Pihlajavesi, Finland

Cited by 6 publications

References 30 publications

Diet composition and seasonal feeding patterns of a freshwater ringed seal (Pusa hispida saimensis)

Diet composition and seasonal feeding patterns of a freshwater ringed seal (Pusa hispida saimensis)

Fish density and target strength distribution of single fish echoes in varying light conditions with single and split beam echosounding and trawling

Sealed in a lake — Biology and conservation of the endangered Saimaa ringed seal: A review

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