The Application of Image Processing Technology for the Analysis of Fish School Behavior: Evaluation of Fish School Behavior Response to the Approaching Vessel Using Scanning Sonar

Lee, Yoo-Won; Mukai, T.; Iida, Kazuhiro; Hwang, Doo–Jin; Shin, Hyeong‐Il

doi:10.5657/fas.2002.5.3.212

Cited by 2 publications

(1 citation statement)

References 11 publications

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“…Fish avoidance was an important consideration when the study design was developed. Fish avoidance behavior in response to a moving survey vessel and engine noise has been a problem with mobile surveys and a source of bias in estimation of fish numbers (MacLennan and Simmonds 1992; Lee et al 2002). Changes in fish depth and swim speed (Olsen et al 1983) as well as changes in fish density (Olsen 1990;Freon et al 1993) have been observed and associated with boat avoidance.…”

Section: Introductionmentioning

confidence: 99%

The Distribution and Flux of Fish in the Forebay of The Dalles Dam in 2003

Faber¹,

Hanks²,

Zimmerman³

et al. 2005

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In spring and summer 2003, the Pacific Northwest National Laboratory led a team that conducted mobile and fixed hydroacoustic surveys in the forebay of The Dalles Dam for the U.S. Army Corps of Engineers-Portland District. This research was part of the Corps' Anadromous Fish Evaluation Program. The surveys provided information on the distribution and movement of smolt-sized fish relative to ambient factors such as flow, bathymetry, or diel cycle in the forebay at The Dalles Dam. A proposal for the use of a guidance structure in the forebay at The Dalles Dam, a modified version of a similar structure located at Lower Granite Dam, has recently been suggested by the U.S. Army Corps of Engineers and regional resource managers as a potential approach to improve the passage survival of juvenile salmon at the dam. The structure would be designed to divert fish from the powerhouse to the spillway. This project provided baseline data for the development of a behavioral guidance structure and surface bypass alternatives for juvenile salmon at The Dalles Dam. We sampled the forebay of The Dalles Dam one day and night each week for six weeks in the spring and another six weeks in the summer. Two research vessels were used. Each pushed a raft outfitted with sampling gear consisting of two split-beam transducers, four single-beam transducers, one acoustic Doppler current profiler (ADCP), a pitch-roll-heading indicator, and a differential global positioning system (GPS). The split-beam transducers provided information on the location, size, and movement of fish. The ADCP sampled the flow environment in which each fish was detected. One 12° split-beam transducer was aimed downward. The other split-beam transducers and the four single-beam transducers were all forward-looking 6° beams that were aimed to provide intensive sampling in the upper 9 m of the water column. The rafts were secured 7.5 m forward of the bow of the research vessels (15 m from the vessel's outboard motor) to minimize fish avoidance behavior. Mobile sampling was conducted from a research vessel and raft moving in a zigzag pattern extending from 180 m above the spillway to 1.8 km upstream of the spillway along 26 transects during each sampling period. A second research vessel sampled at 15 fixed-point locations for ten minutes at each point. From the fixed sampling we determined the rate and the direction of fish movement past those points (flux). Using the combined mobile and fixed sampling methods we were able to determine the distribution of smolt-sized fish and their movement patterns in the forebay. Smolt-sized fish were defined as those with a return signal of greater than-56 dB re||1µPa and less than-34 dB for spring fish (90-320 mm) or less than-45 dB for summer fish (90-105 mm). The species of smolt-sized fish that were targeted for springtime samples were juvenile steelhead trout (Oncorhynchus mykiss), juvenile yearling Chinook salmon (O. tshawytscha), juvenile coho salmon (O. kisutch), and juvenile sockeye salmon (O. nerka). Summertime samples were ...

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Section: Introductionmentioning

confidence: 99%

The Distribution and Flux of Fish in the Forebay of The Dalles Dam in 2003

Faber¹,

Hanks²,

Zimmerman³

et al. 2005

View full text Add to dashboard Cite

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Evolutionary impact of size-selective harvesting on shoaling behavior: Individual-level mechanisms and possible consequences for natural and fishing mortality

Sbragaglia

Klamser

Romanczuk

et al. 2019

Preprint

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Many fisheries around the globe preferentially capture large individuals with implications for the evolution of exploited populations. Fisheries-induced evolution may alter collective behavioral phenotypes through individual-level adaptations that affect boldness, swimming speed and tendency to follow social vs. environmental cues. Studying the behavioural mechanisms that give rise to possible changes in shoaling and other collective outputs is challenging in the wild, but first insights into whether intensive and size-selective harvesting could alter collective phenotypes and shoaling can be gathered through experiment of size-selective harvesting conducted in the laboratory. We present a multi-generation harvest selection experiment with zebrafish (Danio rerio) as a model species and demonstrate that large size-selective harvesting typical of global fisheries decreases risk-taking behavior of individuals, and surprisingly also decreases shoal cohesion. This counter-intuitive effect at the collective level is mechanistically caused by risk-averse individuals favored under large size-selective harvest paying more attention to environmental instead of social cues. Agent-based model simulations further reveal that fisheries-induced evolution of shoaling behavior is adaptive under fishing scenarios by decreasing exploitation rate. By contrast, the same collective behavior favored by size-selective harvesting is maladaptive in the presence of natural predation and increases natural mortality. The evolutionary adaptations we document may slowly, but steadily erode the natural fitness benefits offered by shoaling in many species targeted by global fisheries. Erosion of shoal cohesion can also negatively affect catchability with consequences for human well-being. boldness | cohesion | swimming | catchability | collective | fishing

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The Application of Image Processing Technology for the Analysis of Fish School Behavior: Evaluation of Fish School Behavior Response to the Approaching Vessel Using Scanning Sonar

Cited by 2 publications

References 11 publications

The Distribution and Flux of Fish in the Forebay of The Dalles Dam in 2003

The Distribution and Flux of Fish in the Forebay of The Dalles Dam in 2003

Evolutionary impact of size-selective harvesting on shoaling behavior: Individual-level mechanisms and possible consequences for natural and fishing mortality

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