Lašišų (Salmo salar) ir šlakių (Salmo trutta) nerštinės migracijos stebėjimas radijo telemetriniais metodais Siesarties upėje /
The population of Atlantic salmon (Salmo salar L.) and Sea trout (Salmo trutta trutta L.) in Lithuania used to be much bigger. But by the beginning of this century due to the increased water pollution and dam construction improvement stocks of these species almost reached the level of extinction. Th...
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2014
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ftvilniusuniv:oai:vu.lt:elaba:2162815 2024-09-15T17:56:31+00:00 Lašišų (Salmo salar) ir šlakių (Salmo trutta) nerštinės migracijos stebėjimas radijo telemetriniais metodais Siesarties upėje / Researches of spawing migration of salmo salar and salmo trutta by the help of radio telemetric methods in siesartis river. Jarašius, Leonas Kaupinis, Algirdas 2014 application/pdf https://repository.vu.lt/VU:ELABAETD2162815&prefLang=en_US lit eng lit eng Institutional Repository of Vilnius University https://epublications.vu.lt/object/elaba:2162815/2162815.pdf https://repository.vu.lt/VU:ELABAETD2162815&prefLang=en_US info:eu-repo/semantics/openAccess info:eu-repo/semantics/masterThesis 2014 ftvilniusuniv 2024-06-24T14:17:35Z The population of Atlantic salmon (Salmo salar L.) and Sea trout (Salmo trutta trutta L.) in Lithuania used to be much bigger. But by the beginning of this century due to the increased water pollution and dam construction improvement stocks of these species almost reached the level of extinction. That is why some measures where taken to save the population. In 2005 fish ladder was built in Siesartis river providing fish access to extra 25 km of the rivers respectively. In Siesartis River distribution of redds bellow and above dam varied significantly over monitoring area. The biggest increase of redds above dam was in 2007-2008, 2-3 years after fish ladders construction. In 2008 relative abundance of redds above the dam was significantly greater than bellow the dam and mean values of relative redds abundance, area and mean size over all monitoring period were also greater for river stretch above the dam. From radio tagged 18 salmonid specimens in Siesartis river 13 (10 females and 3 males) were registered very close (<50 m) to fish ladder. Of those registered 9 fishes ascended fish ladders and 6 of them passage. Movement analysis through fish ladders revealed that most time fishes spent in the middle of fish ladders. Fish ladders passage time did not depend on sex neither on fish size (Mann-Whitney U test p>0.05). Radio tracking studies revealed that Valtūnai hydropower plant fish ladders efficiency was 66 % - two thirds of salmonids ascending fish ladders actually passed it. Master Thesis Atlantic salmon Salmo salar Vilnius University Virtual Library (VU VL) |
institution |
Open Polar |
collection |
Vilnius University Virtual Library (VU VL) |
op_collection_id |
ftvilniusuniv |
language |
Lithuanian English |
description |
The population of Atlantic salmon (Salmo salar L.) and Sea trout (Salmo trutta trutta L.) in Lithuania used to be much bigger. But by the beginning of this century due to the increased water pollution and dam construction improvement stocks of these species almost reached the level of extinction. That is why some measures where taken to save the population. In 2005 fish ladder was built in Siesartis river providing fish access to extra 25 km of the rivers respectively. In Siesartis River distribution of redds bellow and above dam varied significantly over monitoring area. The biggest increase of redds above dam was in 2007-2008, 2-3 years after fish ladders construction. In 2008 relative abundance of redds above the dam was significantly greater than bellow the dam and mean values of relative redds abundance, area and mean size over all monitoring period were also greater for river stretch above the dam. From radio tagged 18 salmonid specimens in Siesartis river 13 (10 females and 3 males) were registered very close (<50 m) to fish ladder. Of those registered 9 fishes ascended fish ladders and 6 of them passage. Movement analysis through fish ladders revealed that most time fishes spent in the middle of fish ladders. Fish ladders passage time did not depend on sex neither on fish size (Mann-Whitney U test p>0.05). Radio tracking studies revealed that Valtūnai hydropower plant fish ladders efficiency was 66 % - two thirds of salmonids ascending fish ladders actually passed it. |
author2 |
Kaupinis, Algirdas |
format |
Master Thesis |
author |
Jarašius, Leonas |
spellingShingle |
Jarašius, Leonas Lašišų (Salmo salar) ir šlakių (Salmo trutta) nerštinės migracijos stebėjimas radijo telemetriniais metodais Siesarties upėje / |
author_facet |
Jarašius, Leonas |
author_sort |
Jarašius, Leonas |
title |
Lašišų (Salmo salar) ir šlakių (Salmo trutta) nerštinės migracijos stebėjimas radijo telemetriniais metodais Siesarties upėje / |
title_short |
Lašišų (Salmo salar) ir šlakių (Salmo trutta) nerštinės migracijos stebėjimas radijo telemetriniais metodais Siesarties upėje / |
title_full |
Lašišų (Salmo salar) ir šlakių (Salmo trutta) nerštinės migracijos stebėjimas radijo telemetriniais metodais Siesarties upėje / |
title_fullStr |
Lašišų (Salmo salar) ir šlakių (Salmo trutta) nerštinės migracijos stebėjimas radijo telemetriniais metodais Siesarties upėje / |
title_full_unstemmed |
Lašišų (Salmo salar) ir šlakių (Salmo trutta) nerštinės migracijos stebėjimas radijo telemetriniais metodais Siesarties upėje / |
title_sort |
lašišų (salmo salar) ir šlakių (salmo trutta) nerštinės migracijos stebėjimas radijo telemetriniais metodais siesarties upėje / |
publisher |
Institutional Repository of Vilnius University |
publishDate |
2014 |
url |
https://repository.vu.lt/VU:ELABAETD2162815&prefLang=en_US |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_relation |
https://epublications.vu.lt/object/elaba:2162815/2162815.pdf https://repository.vu.lt/VU:ELABAETD2162815&prefLang=en_US |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1810432715289264128 |