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Electrofishing method improves evaluation of amphibian larvae abundance: a case of "beaver rivers".

https://arctichealth.org/en/permalink/ahliterature287520
Source
Integr Zool. 2017 Jul;12(4):345-350
Publication Type
Article
Date
Jul-2017
Author
Yury Y Dgebuadze
Ivan V Bashinskiy
Source
Integr Zool. 2017 Jul;12(4):345-350
Date
Jul-2017
Language
English
Publication Type
Article
Keywords
Amphibians
Animals
Environmental monitoring
Larva
Rivers
Rodentia
Russia
Abstract
There are many locations in Russia where Eurasian beaver (Castor fiber) populations have been restored. As a keystone species, beavers provide wide-ranging direct and indirect impacts on aquatic ecosystems. In particular, beaver-created ponds are sites for spawning and nursery places for tadpoles of the brown frogs (genus Rana). Because of such impacts, study techniques for assessing aquatic organism abundance are being developed. We compared two methods for estimating tadpole abundance: traditional catches by dipnet and electrofishing. Our results show that the dipnet catch data for the shallower ponds with larger water surface area were five times lower than that obtained by electrofishing. Therefore, we conclude that dipnet catches are not suitable for comparing the relative abundance of tadpoles in the two beaver ponds that were studied.
PubMed ID
27991719 View in PubMed
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Fatty Acid Composition and Contents of Seven Commercial Fish Species of Genus Coregonus from Russian Subarctic Water Bodies.

https://arctichealth.org/en/permalink/ahliterature292603
Source
Lipids. 2017 Dec; 52(12):1033-1044
Publication Type
Journal Article
Date
Dec-2017
Author
Michail I Gladyshev
Nadezhda N Sushchik
Olesia N Makhutova
Larisa A Glushchenko
Anastasia E Rudchenko
Alexander A Makhrov
Elena A Borovikova
Yury Y Dgebuadze
Author Affiliation
Institute of Biophysics of Siberian Branch of Federal Research Center "Krasnoyarsk Science Center" of Russian Academy of Sciences, Akademgorodok, 50/50, Krasnoyarsk, 660036, Russia. glad@ibp.ru.
Source
Lipids. 2017 Dec; 52(12):1033-1044
Date
Dec-2017
Language
English
Publication Type
Journal Article
Keywords
Animals
Docosahexaenoic Acids - analysis - chemistry
Eicosapentaenoic Acid - analysis - chemistry
Fishes - classification - metabolism
Lakes
Muscle, Skeletal - chemistry
Rivers
Russia
Abstract
In several Russian northern lakes and rivers, Arctic cisco Coregonus autumnalis, least cisco C. sardinella, peled C. peled, tugun C. tugun, broad whitefish C. nasus, whitefish C. lavaretus and vendace C. albula were sampled in periods of officially permitted commercial fishery. Special attention was paid to contents (mg g-1 of wet weight) of eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) in muscle tissues (filets), which are essential for human nutrition. The highest values of EPA + DHA content in semi-anadromous fish and freshwater fish were recorded for C. autumnalis from the Yenisei River, 17.60 mg g-1 wet weight, and for C. lavaretus from the Sobachye Lake, 16.61 mg g-1 wet weight, respectively. Intra-genus variations of EPA + DHA contents of Coregonus species were from 1.87 to 17.60 mg g-1 wet weight. Since the congeneric species were genetically close to each other, the variations in EPA and DHA contents were thought to be caused primarily by ecological factors: migrational capability, type of feeding and trophic status of aquatic ecosystems. In general, the majority of studied species appeared to be of a high nutritive value for humans, although unfavorable environmental conditions could considerably diminish this value.
Notes
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PubMed ID
28965211 View in PubMed
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Fatty Acid Composition and Contents of Seven Commercial Fish Species of Genus Coregonus from Russian Subarctic Water Bodies.

https://arctichealth.org/en/permalink/ahliterature285913
Source
Lipids. 2017 Sep 30;
Publication Type
Article
Date
Sep-30-2017
Author
Michail I Gladyshev
Nadezhda N Sushchik
Olesia N Makhutova
Larisa A Glushchenko
Anastasia E Rudchenko
Alexander A Makhrov
Elena A Borovikova
Yury Y Dgebuadze
Source
Lipids. 2017 Sep 30;
Date
Sep-30-2017
Language
English
Publication Type
Article
Abstract
In several Russian northern lakes and rivers, Arctic cisco Coregonus autumnalis, least cisco C. sardinella, peled C. peled, tugun C. tugun, broad whitefish C. nasus, whitefish C. lavaretus and vendace C. albula were sampled in periods of officially permitted commercial fishery. Special attention was paid to contents (mg g(-1) of wet weight) of eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) in muscle tissues (filets), which are essential for human nutrition. The highest values of EPA + DHA content in semi-anadromous fish and freshwater fish were recorded for C. autumnalis from the Yenisei River, 17.60 mg g(-1) wet weight, and for C. lavaretus from the Sobachye Lake, 16.61 mg g(-1) wet weight, respectively. Intra-genus variations of EPA + DHA contents of Coregonus species were from 1.87 to 17.60 mg g(-1) wet weight. Since the congeneric species were genetically close to each other, the variations in EPA and DHA contents were thought to be caused primarily by ecological factors: migrational capability, type of feeding and trophic status of aquatic ecosystems. In general, the majority of studied species appeared to be of a high nutritive value for humans, although unfavorable environmental conditions could considerably diminish this value.
PubMed ID
28965211 View in PubMed
Less detail

Triploidy does not decrease contents of eicosapentaenoic and docosahexaenoic acids in filets of pink salmon Oncorhynchus gorbuscha.

https://arctichealth.org/en/permalink/ahliterature279092
Source
Food Chem. 2017 Feb 01;216:66-9
Publication Type
Article
Date
Feb-01-2017
Author
Michail I Gladyshev
Valentina S Artamonova
Alexander A Makhrov
Nadezhda N Sushchik
Galina S Kalachova
Yury Y Dgebuadze
Source
Food Chem. 2017 Feb 01;216:66-9
Date
Feb-01-2017
Language
English
Publication Type
Article
Keywords
Animals
Aquaculture
Diploidy
Docosahexaenoic Acids - analysis
Eicosapentaenoic Acid - analysis
Female
Male
Muscle, Skeletal - chemistry
Russia
Salmon - genetics - metabolism
Seafood - analysis
Triploidy
Abstract
Triploid fish has become an important item of commercial aquaculture, but data on its fatty acid (FA) composition are still controversial, especially regarding essential polyunsaturated fatty acids, eicosapentaenoic acid (20:5n-3, EPA) and docosahexaenoic acid (22:6n-3, DHA). We studied FA composition and content of diploid and triploid pink salmon Oncorhynchus gorbuscha, reared in aquaculture in a bay of the White Sea (Russia). FA composition, measured as percentages of total FA of triploids and immature diploid females significantly differed from that of mature diploid fish. Specifically, mature diploids had higher percentage of EPA and DHA in their muscle tissue (filets) compared to that of triploids and immature diploid females. Nevertheless, the contents of EPA and DHA per mass of the filets in diploid and triploid specimens were similar. Thus, no special efforts are needed to improve EPA and DHA contents in filets of triploids.
PubMed ID
27596393 View in PubMed
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