An ultrasonic telemetric system for automatic positioning of individual fish used to track Atlantic salmon (Salmo salar L.) in a sea cage

Juell, Jon‐Erik; Westerberg, Håkan

doi:10.1016/0144-8609(93)90023-5

Cited by 97 publications

(63 citation statements)

References 3 publications

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“…The main effect of the continuous light was to increase the nighttime swimming activity (V night ) during the winter and early spring in accordance with Oppedal et al (2001) and in contrast to the high V day and low V night of the NL fish (earlier described by Juell & Westerberg (1993), Juell (1995) and Oppedal et al (2001). This diel rhythm in swimming speed under natural light has been related to light level and might reflect a natural activity rhythm or a loss of ability to school below a critical light level (Juell 1995).…”

Section: Swimming Activitymentioning

confidence: 99%

Effects of light source and intensity on sexual maturation, growth and swimming behaviour of Atlantic salmon in sea cages

Hansen¹,

Fjelldal²,

Folkedal³

et al. 2017

Aquacult. Environ. Interact.

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We investigated how highly efficient LED light sources may be used in Atlantic salmon cage farming. Specifically, we tested the incidence of sexual maturation and growth patterns in autumn sea-transferred Atlantic salmon Salmo salar L. during their second sea winter given continuous artificial light (LL) (between 13 January and 18 June) of 5 different intensities using LED sources, compared to a single intensity provided by a metal halide (MH) source or a control treatment of natural light (NL). Growth effects were independent of light source, but increased with irradiance. We propose a model wherein sufficiently high irradiance from the artificial light source will give a long day signal throughout late winter and spring, an intermediate irradiation will give a long day signal until it is outcompeted by the seasonal increase in natural light, and an irradiance that is always below the threshold will not be perceived as different from natural light. Sexual maturation in males (6.1% under NL) was evenly arrested at all intensities, and swimming activity at night increased during winter in lit groups. We conclude that LED lamps may replace MH sources at similar intensity. Reducing the light irradiance of the superimposed light reduced the growth-stimulating effect, but all irradiances reduced the incidence of sexual maturation.

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Section: Swimming Activitymentioning

confidence: 99%

Effects of light source and intensity on sexual maturation, growth and swimming behaviour of Atlantic salmon in sea cages

Hansen¹,

Fjelldal²,

Folkedal³

et al. 2017

Aquacult. Environ. Interact.

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“…With regards to swimming depth, subgroups within the same sea cage are commonly observed, and may be explained by different hunger levels or unsynchronized feeding rhythms (Juell and Westerberg 1993;Juell et al 1994;Juell 1995;Fernö et al 1995). A positive correlation between hunger level and surface attraction has been showed at group level for caged salmon (Juell et al 1994), and could be a likely cause of small and thus potentially hungrier fish to maintain position close to surface.…”

Section: Competition and Feedingmentioning

confidence: 99%

“…Such was not observed by the measuring frame, and may be explained by the heavy fish eating at greater depths, or simply that a lack of registrations of heavy fish at 3 m was due to individuals showing feeding behaviour not swimming through the frame as when schooling. Typically, feeding fish change from normal schooling and swim towards pellets in a more directed pattern (Juell and Westerberg 1993;Ang and Petrell 1998).…”

Section: Competition and Feedingmentioning

confidence: 99%

Sea caged Atlantic salmon display size-dependent swimming depth

Folkedal

Stien

Nilsson

et al. 2012

Aquat. Living Resour.

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-The present study investigates vertical distribution of fish size in three 12 m × 12 m wide and 14 m deep sea cages stocked with Atlantic salmon of average weight from 3.5 to 3.7 kg, at commercial densities between 15.6 to 16.2 kg m −3 , in Norway. For each cage, individual fish weight were estimated by three 0.6 m × 0.6 m measuring frames as fish swam through. The frames were positioned at 3, 6 and 9 m depth. Recordings were carried out over five days per cage in succession, and during relatively stable environmental conditions in late autumn 2010. In all cages, measured fish were 15−25% smaller at 3 m compared to the average weights at 6 and 9 m depth. Largest average weight difference between depths within one cage was 0.995 kg. The average weight at 6 and 9 m was higher at night-time compared to daytime. Fish at the lower end of the weight spectrum were predominantly registered at 3 m, while fish at the higher end of the spectrum were mostly registered at the greater depths. Fish of average size were well represented at all three depths. The fact that smaller fish swam shallower may be ascribed to natural behavioural traits and introduce an important consideration in representative sampling within commercial sea cages. In biomass estimations and sea lice counts size-dependent vertical stratification needs to be accounted for.

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“…There are several mathematical ways to obtain the exact solutions to the equations above (Watkins and Schevill 1972;Fang 1990;Spiesberger and Fristrup 1990;Juell and Westerberg 1993;Wahlberg et al 2001). Wahlberg et al (2001) applied a synthesis of the methods used by Watkins and Schevill (1972) and Spiesberger and Fristrup (1990).…”

Section: Tracking Algorithmsmentioning

confidence: 99%

Acoustic Telemetry Evaluation of Juvenile Salmonid Passage and Survival at John Day Dam with Emphasis on the Prototype Surface Flow Outlet, 2008

Weiland¹,

Ploskey²,

Hughes³

et al. 2009

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Executive SummaryImproving survival rates of juvenile salmonids through the Federal Columbia River Power System (FCRPS) continues to be a high priority for the U.S. Army Corps of Engineers, Portland District. Many of these fish are from populations listed as threatened or endangered under the Endangered Species Act of 1973. Increased survival rates are necessary to meet performance standards set forth in the 2008 Biological Opinion (BiOp) on FCRPS operations. The BiOp mandates 96% and 93% survival rates be achieved for spring and summer downstream migrating juvenile salmonids, respectively. At John Day Dam, the Portland District is evaluating the provision of surface flow outlets (SFOs) as a means to increase fish-passage efficiency and in turn increase passage survival rates by reducing turbine passage of juvenile salmonids. The goal of the study reported herein is to provide the passage and survival data necessary to evaluate the performance of the prototype SFO and the dam as a whole relative to the standards in the BiOp. The study was conducted by the Pacific Northwest National Laboratory and the University of Washington. The Portland District and regional fisheries managers will use the data to adaptively manage the configuration and operation of John Day Dam to maximize the survival rates of juvenile salmonids. ObjectivesIn this report, we present survival estimates, passage efficiencies, and fish behavior data for acoustictagged steelhead (STH), yearling Chinook salmon (YC), and subyearling Chinook salmon (SYC) passing through John Day Dam during 2008. We examined the data relative to two spill treatments, 30% versus 40% spill out of total water discharge through the dam, to assess the performance of SFOs, called topspill weirs (TSWs). The field study period was from April 29 to August 20, 2008. The objectives were as follows:• Survival Rates -Estimate single-and paired-release, route-specific, dam-passage, and concrete-passage survival rates for YC, STH, and SYC passing through John Day Dam for each of two spillway operational treatments.• Fish Passage -Estimate passage proportions among major passage routes, and calculate efficiency and effectiveness metrics for each of two spillway operational treatments for YC, STH, and SYC separately.-Estimate travel times (forebay residence and tailrace egress) of YC, STH, and SYC for each of two spill treatments.• Fish Behavior -Characterize fish behaviors, including forebay approach paths, for YC, STH, and SYC and compare approach paths with the final route of passage for each of two spill treatments.-Describe vertical and horizontal distributions and residence times of YC, STH, and SYC within the dam forebay. MethodsThis study used the Juvenile Salmon Acoustic Telemetry System (JSATS). We surgically implanted acoustic tags and passive integrated transponder tags in 3447 YC and 3450 STH in spring and in 5931 SYC in summer. Median lengths of tagged fish were as follows: YC = 158 mm; STH = 217 mm; SYC = 117 mm.Tagged YC and STH were released daily over a 29-day spr...

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An ultrasonic telemetric system for automatic positioning of individual fish used to track Atlantic salmon (Salmo salar L.) in a sea cage

Cited by 97 publications

References 3 publications

Effects of light source and intensity on sexual maturation, growth and swimming behaviour of Atlantic salmon in sea cages

Effects of light source and intensity on sexual maturation, growth and swimming behaviour of Atlantic salmon in sea cages

Sea caged Atlantic salmon display size-dependent swimming depth

Acoustic Telemetry Evaluation of Juvenile Salmonid Passage and Survival at John Day Dam with Emphasis on the Prototype Surface Flow Outlet, 2008

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