Survival of radio-tagged Atlantic salmon (Salmo salar L.) and trout (Salmo trutta L.) smolts passing a reservoir during seaward migration

被引:171
作者
Jepsen, N
Aarestrup, K
Okland, F
Rasmussen, G
机构
[1] Danish Inst Fisheries & Marine Res, Dept Inland Fisheries, DK-8600 Silkeborg, Denmark
[2] Norwegian Inst Nat Res, N-7005 Trondheim, Norway
关键词
smolt; Salmo salar; Salmo trutta; radio-telemetry; predation;
D O I
10.1023/A:1017047527478
中图分类号
Q17 [水生生物学];
学科分类号
071004 ;
摘要
High mortality-rates of seaward migrating salmonid smelts when passing reservoirs and lakes have earlier been found in the Danish River Gudena watershed. To reveal the causes of mortality of migrating smelts in Lake Tange, a 12 km long, shallow reservoir, 50 salmon smelts and 24 trout smelts were tagged with internal miniature radio-transmitters, and released in the river just upstream the reservoir on May 1, 1996. The salmon smelts were hatchery-reared, while the trout smelts were wild fish, caught in a smelt trap. The tagged smelts were tracked daily for 3 weeks, and when possible the cause of death was determined. During the 3-week period, 90% of the tagged smelts died. The main cause of death for both trout and salmon was predation from fish and birds. The most important predator was pike (Esox lucius L.), being responsible for 56% of the observed mortality. Avian predators were assumed to be responsible for 31% of the observed mortality. No trout smelts left the reservoir, but 5 salmon-smelts got out through the turbines. Others did traverse the reservoir, but were unable to enter the river downstream, and were later eaten. The present results suggest that mortalities for migrating smolts through Lake Tange are of such a magnitude, that stocking of juveniles in the river upstream is futile, and further, that the establishment of a natural population of salmon or sea-trout in river Gudena, upstream Tange, is unrealistic under present conditions.
引用
收藏
页码:347 / 353
页数:7
相关论文
共 28 条
[1]   PHOTORECEPTORS AND VISUAL PIGMENTS AS RELATED TO BEHAVIORAL-RESPONSES AND PREFERRED HABITATS OF PERCHES (PERCA-SPP) AND PIKEPERCHES (STIZOSTEDION-SPP) [J].
ALI, MA ;
RYDER, RA ;
ANCTIL, M .
JOURNAL OF THE FISHERIES RESEARCH BOARD OF CANADA, 1977, 34 :1475-1480
[2]  
BAKSHTANSKY EL, 1981, J ICHTYOL, V20, P93
[3]   TIMING OF SEA-RUN BROWN TROUT (SALMO-TRUTTA) SMOLT MIGRATION - EFFECTS OF CLIMATIC VARIATION [J].
BOHLIN, T ;
DELLEFORS, C ;
FAREMO, U .
CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES, 1993, 50 (06) :1132-1136
[4]   OBSERVATIONS ON THE SEAWARD MIGRATION OF ATLANTIC SALMON (SALMO-SALAR L) SMOLTS THROUGH A LARGE LAKE AS DETERMINED BY RADIOTELEMETRY AND CARLIN TAGGING STUDIES [J].
BOURGEOIS, CE ;
OCONNELL, MF .
CANADIAN JOURNAL OF ZOOLOGY-REVUE CANADIENNE DE ZOOLOGIE, 1988, 66 (03) :685-691
[5]   NORTHERN SQUAWFISH (PTYCHOCHEILUS-OREGONENSIS) PREDATION ON JUVENILE SALMONIDS IN SECTIONS OF THE WILLAMETTE RIVER BASIN, OREGON [J].
BUCHANAN, DV ;
HOOTON, RM ;
MORING, JR .
CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES, 1981, 38 (03) :360-364
[6]  
CARL LM, 1995, T AM FISH SOC, V124, P77, DOI 10.1577/1548-8659(1995)124<0077:STOBIL>2.3.CO
[7]  
2
[8]   DIRECT OBSERVATION OF HABITAT UTILIZATION BY NORTHERN PIKE [J].
CHAPMAN, CA ;
MACKAY, WC .
COPEIA, 1984, (01) :255-258
[9]  
Dellefors Claes, 1995, Nordic Journal of Freshwater Research, V70, P31
[10]  
DIANA JS, 1977, T AM FISH SOC, V106, P560, DOI 10.1577/1548-8659(1977)106<560:MAHPON>2.0.CO