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Воспроизводство атлантического лосося (Salmo salar L. ) (Salmoniformes, Salmonidae) (пресноводная форма) на рекультивированном нерестово-выростном участке реки Суна

Воспроизводство атлантического лосося (Salmo salar L. ) (Salmoniformes, Salmonidae) (пресноводная форма) на рекультивированном нерестово-выростном участке реки Суна

Abstract

The distribution density of juveniles in DDP after remediation and the number of producers of freshwater salmon are studied. In 2005, the density of settlements of juveniles in DDP was 3,7 ind./100 m 2, in 2006, 49,7 ind./100 m 2 juveniles were represented by three age groups (0 +... 2 +). Further, the density of settlements gradually increased reaching a maximum in 240 ind./100 m 2 in total for all age groups in 2008. In the future, the density of settlements varied at the level of 194,3 ind./100 м 2 in 2012 and 192 ind./100 m 2 in 2013, with the marked decrease to 150,6 ind./100 m 2 in 2012. During the period of observation the age composition of juveniles stabilized. On linear and weight parameters juvenile salmon of the river Suna in the age groups of 0+ and 1+ exceeded juveniles from other tributaries of Onega (Shuya, Coombs, Nemina, Pyalma) and Ladoga lakes (p. Hiitola). The growth rate of the young salmon from Suna river is comparable to the growth rate of the juvenile from other tributaries of Lake Onega. The daily gain of fingerlings is 29,54 mg/day and 140,36 mg/day for parr (1+). Annual participation in spawning involves 45 fish species coming from the waters adjacent to the Waterfall Kivach.

Исследованы плотности распределения молоди на нерестово-выростных участках (НВУ) после рекультивации и численность производителей пресноводного лосося. В 2005 году плотность расселения молоди на НВУ составила 3,7 экз./100 м 2, в 2006 году 49,7 экз./100 м 2, молодь была представлена тремя возрастными группами (0+... 2+). Далее плотности расселения постепенно увеличивались, достигнув максимума в 240 экз./100 м 2 суммарно для всех возрастных групп в 2008 году. В дальнейшем плотности расселения варьировали на уровне 194,3 экз./100 м 2 в 2012 и 192 экз./100 м 2 в 2013 году со снижением до 150,6 экз./100 м 2 в 2012-м. За период наблюдений возрастной состав молоди стабилизировался. По линейным и весовым показателям молодь лосося реки Суна возрастных групп 0+ и 1+ превосходит молодь из других притоков Онежского (Шуя, Кумса, Немина, Пяльма) и Ладожского озер (Хийтола). По темпу роста молодь лосося реки Суна не уступает молоди из других притоков Онежского озера. Суточный привес сеголетков составляет 29,54 мг/сут и 140,36 мг/сут для пестряток (1+). Ежегодно на НВУ под водопадом Кивач в нересте участвуют до 45 особей.

Keywords

ПРЕСНОВОДНЫЙ ЛОСОСЬ,ПЛОЩАДЬ НЕРЕСТОВО-ВЫРОСТНЫХ УЧАСТКОВ,ПЛОТНОСТЬ РАССЕЛЕНИЯ МОЛОДИ,FRESHWATER SALMON,SPAWNING AND REARING AREA SITES,DENSITY OF JUVENILES' SETTLEMENT

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
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