scholarly journals Catch per unit effort estimation and factors influencing it from recreational angling of sockeye salmon (Oncorhynchus nerka) and management implications for Lake Toya, Japan

2015 ◽  
Vol 20 (4) ◽  
pp. 264-274 ◽  
Author(s):  
Emmanuel A. Sweke ◽  
Yu Su ◽  
Shinya Baba ◽  
Takashi Denboh ◽  
Hiroshi Ueda ◽  
...  
Keyword(s):  
Sockeye Salmon ◽  
Oncorhynchus Nerka ◽  
Effort Estimation ◽  
Catch Per Unit Effort ◽  
Management Implications ◽  
Factors Influencing ◽  
Unit Effort ◽  
Recreational Angling ◽  
Lake Toya

Density and Distribution of Young Sockeye Salmon (Oncorhynchus nerka) throughout a Multibasin Lake System

1958 ◽  
Vol 15 (5) ◽  
pp. 961-982 ◽  
Author(s):  
W. E. Johnson
Keyword(s):  
Population Density ◽  
Sockeye Salmon ◽  
Oncorhynchus Nerka ◽  
Catch Per Unit Effort ◽  
Lake System ◽  
Unit Effort ◽  
Limited Dispersal ◽  
Discrete Populations

Estimates of density (based on catch per unit effort with tow nets) of fingerling sockeye salmon populations in a large (174 sq. mile) multibasin lake system were carried out during 1955, 1956 and 1957. Density and distribution of fingerling sockeye throughout the lake system are related to density and distribution of the spawning parent populations. Discrete populations associated with discrete basins point to a limited dispersal as a result of the multibasin nature of the lake system. In one example, higher population density appears to result in greater dispersal.

Tributary Homing of Sockeye Salmon at Brooks and Karluk Lakes, Alaska

1964 ◽  
Vol 21 (3) ◽  
pp. 485-504 ◽  
Author(s):  
Wilbur L. Hartman ◽  
Robert F. Raleigh
Keyword(s):  
Sockeye Salmon ◽  
Oncorhynchus Nerka ◽  
Small Lakes ◽  
Management Implications ◽  
Spawning Grounds ◽  
Spawning Area ◽  
Spawning Areas ◽  
Final Study ◽  
Color Combinations ◽  
Original Donor

The degree of preference of sockeye salmon (Oncorhynchus nerka) for spawning in specific tributaries to Brooks and Karluk Lakes, Alaska, was studied in 1960 and 1961. Adult sockeye salmon begin to congregate around stream mouths soon after entering these lakes. At Brooks Lake, groups of fish were seined from various stream mouths and marked with distinctive tag color combinations. One group of tagged fish from each seine haul was released back into the original donor congregation as a control, and one or more groups were transported and released into congregations around other tributary mouths. Strength of tributary preference was determined by comparing the number of fish from each group distributed on the various spawning grounds. Eighty-three per cent of the 958 fish tagged were recovered at weirs and on stream and lake surveys. Distribution to spawning areas of sockeye salmon in control and transported groups was virtually identical. The study at Brooks Lake was followed by a study at Karluk Lake to explore further the strength of tributary preference. Very few sockeye salmon experimentally prevented from entering their preferred tributary chose an alternative spawning area. Most continued to attempt to enter their blocked tributary until death. A final study at Karluk Lake confirmed the fact that sockeye salmon entering the lake were predisposed to spawn in a particular tributary and could not be conditioned to enter an alternative tributary. We conclude that sockeye salmon are indeed homing to particular tributaries in these small lakes. The biological and management implications of these findings are discussed.

Homing and spawning site selection by sockeye salmon (Oncorhynchus nerka) in Iliamna Lake, Alaska

1991 ◽  
Vol 69 (1) ◽  
pp. 176-181 ◽  
Author(s):  
Gregory R. Blair ◽  
Thomas P. Quinn
Keyword(s):  
Site Selection ◽  
Sockeye Salmon ◽  
Oncorhynchus Nerka ◽  
Release Site ◽  
Reproductive Condition ◽  
Spawning Site ◽  
Factors Influencing ◽  
Capture Site ◽  
Site Characteristics ◽  
Ultrasonic Transmitters

Sockeye salmon (Oncorhynchus nerka) spawn along several island beaches and nearby streams in the eastern portion of Iliamna Lake, Alaska. We investigated the importance of homing, attraction to spawning site characteristics, and attraction to conspecifics in similar reproductive condition as factors influencing spawning site selection. Sockeye were displaced reciprocally between two similar island beaches and a dissimilar nearby stream. Few sockeye successfully homed from one beach to another (11%); those displaced to the stream from a beach displayed intermediate homing (24%) and the best homing was back to the stream (65%). More fish remained at the release site when it was similar to the capture site (25%) than when it was dissimilar (4%). Sockeye that left the release site for a beach were more often missing (68%) than those departing for the creek (30%). The use of ultrasonic transmitters revealed that four of six sockeye that departed for a beach were relocated at a spawning beach other than the capture site. Spawning site characteristics apparently play a role in spawning site selection, but the need to spawn at the capture site was more important. Homing was better to the creek, presumably because it had a unique odor and its flow made it easier to locate than the beaches.

Test fishery indices for sockeye salmon (Oncorhynchus nerka) as affected by age composition and environmental variables

2004 ◽  
Vol 61 (1) ◽  
pp. 80-92 ◽  
Author(s):  
Lucy Flynn ◽  
Ray Hilborn
Keyword(s):  
Sockeye Salmon ◽  
Oncorhynchus Nerka ◽  
Average Error ◽  
Fishing Gear ◽  
Migration Route ◽  
Catch Per Unit Effort ◽  
Age Classes ◽  
Age Composition ◽  
Fishery Data ◽  
Average Body

In this paper, we explore sources of variability in test fishing indices for sockeye salmon (Oncorhynchus nerka) and illustrate potential solutions. For our analysis, we use the Port Moller test fishery in Bristol Bay, Alaska. The traditional model used to forecast run size using Port Moller test fishery data is based on a simple linear regression of total returns to the fishing districts against the cumulative test fishery catch-per-unit-effort (CPUE) index on a given date. We show that much of the inaccuracy of recent forecasts based on test fishery indices is due to the variable age composition of sockeye runs and the unequal vulnerability of respective age classes to the test fishing gear. We also illustrate solutions to the problems presented by variability in migration route and variability in return timing. In warmer years, we found that there was an increase in effective vulnerability to the test fishing gear and that the strength of this relationship increased linearly with the average body length of age classes. Retrospective analysis shows that correcting for age composition, migration route, and timing provides an in-season index of abundance with an average error of 6.7 million fish or 21%, compared with 33% for previous models.

Qarun Lake fisheries; Fishing gears, Species composition and Catch per unit effort

2014 ◽  
Vol 18 (2) ◽  
pp. 39-49
Author(s):  
Sabry El-Serafy ◽  
Alaa El-Haweet ◽  
Azza El-Ganiny ◽  
Alaa El-Far
Keyword(s):  
Species Composition ◽  
Catch Per Unit Effort ◽  
Unit Effort ◽  
Fishing Gears ◽  
Lake Fisheries
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