Dorsal-Aspect Target Strength of an Individual Fish

Love, Richard H.

doi:10.1121/1.1912422

Cited by 227 publications

(201 citation statements)

References 6 publications

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“…Les forces de cibles mesurées (-33,4 à -20,4dB) correspondent théoriquement à des poissons dont la longueur totale est d'environ 25 à 120 cm (LOVE, 1971 ;DAHL, 1982). Les saumons atlantiques capturés dans les filets pièges possédaient des longueurs totales variant entre 45 et 121 cm.…”

Section: Discussion -Conclusionunclassified

Application de l'hydroacoustique en milieu fluvial : exemple de l'étude de la montaison du saumon atlantique (Salmo salar L.) par sondage à double faisceau dans la rivière Moisie, Quebec

Levesque

Harte

1994

Bull. Fr. Pêche Piscic.

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Groupe Environnement Shooner inc., 5355, boul. des Gradins, bureau 101, Québec (Québec) G2J 1C8, Canada. RÉSUMÉDes recherches en hydroacoustique ont été conduites en 1990 et 1991, afin d'étudier la migration du saumon atlantique (Salmo salar) au stade d'adulte dans la rivière Moisie. La méthode employée est celle de sondage à double faisceau, en couple. Les résultats montrent que la majorité des saumons atlantiques nagent près du lit de la rivière à de courtes distances du rivage, dans une zone où les vitesses d'écoulement sont inférieures à environ 1 m/s. Les décomptes acoustiques de poissons migrant vers l'amont sont significativement corrélés avec les captures de saumons atlantiques au filet piège (P<0,005). Les observations indiquent que la recherche d'un site d'échantillonnage approprié et la connaissance du comportement du poisson, sont deux étapes essentielles à satisfaire pour assurer la réussite d'une opération de suivi des stocks de poissons migrateurs avec l'usage de l'hydroacoustique. Les données de sondage par écho doivent être validées avec d'autres techniques qui permettent d'établir la composition des espèces présentes et d'évaluer la précision de la méthode hydroacoustique employée. PRACTICAL APPLICATION OF HYDROACOUSTIC SENSING IN RIVERS : THE CASE STUDY OF THE ATLANTIC SALMON (SALMO SALAR L.) SPAWNING RUN AS INVESTIGATED BY DUAL-BEAM ECHOSOUNDING IN THE MOISIE RIVER, QUEBEC. ABSTRACTHydroacoustic experiments were conducted in 1990 and 1991 in order to assess the adult Atlantic salmon (Salmo salar) run on the Moisie River. The method used was the dualdual beam echosounding. Results indicate that most salmons swim near the river bottom, close to the shores, where flow speed is less than about 1m/s. Acoustic counts of fish migrating upstream shows a significant corrélation with salmon catches in trap-nets (P<0,005). Our observations indicate that the sélection of an adéquate sampling site and a good knowledge of fish behaviour are two essential steps to provide for a successful hydroacoustic monitoring of migrating fish stocks. The data from echosounding must be validated by other methods which allow to détermine species composition and to assess the accuracy of the hydroacoustic method used.

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Section: Discussion -Conclusionunclassified

Application de l'hydroacoustique en milieu fluvial : exemple de l'étude de la montaison du saumon atlantique (Salmo salar L.) par sondage à double faisceau dans la rivière Moisie, Quebec

Levesque

Harte

1994

Bull. Fr. Pêche Piscic.

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“…Total reflected voltages from echo integration were converted to absolute areal densities by scaling the voltages by the average backscattered cross section from individual fish targets within 4 dB of the center of the transducer beam. Acoustic size data were transformed to fish lengths by means of Love's dorsal aspect equation (Love 1971). Estimates of gizzard shad lengths were applied to a length-weight equation for gizzard shad in Ohio reservoirs (log e [weight] = 2.7875 · log e [length] − 10.5461) to derive mean weight and population biomass.…”

Section: Methodsmentioning

confidence: 99%

Seasonal Consumptive Demand and Prey Use by Stocked Saugeyes in Ohio Reservoirs

2006

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Community structure and species composition may be strongly influenced by predator-prey interactions resulting from and leading to episodes of population abundance or scarcity. We quantified diets of stocked saugeyes (female walleye Sander vitreus × male sauger S. canadensis) and estimated biomass of their primary prey, gizzard shad Dorosoma cepedianum, in three Ohio reservoirs at quarterly intervals during July 2002-July 2003 to determine whether saugeye consumptive demand could exceed the supply of available gizzard shad prey, resulting in a shift to alternative prey. We incorporated water temperature and saugeye diet composition, growth, and mortality into walleye bioenergetics models, which allowed us to compare estimated prey-specific consumption rates by saugeyes with gizzard shad standing stocks estimated with acoustics. Spring and summer were critical seasons. During spring, gizzard shad biomass was low, saugeye consumptive demand was low, and saugeyes consumed primarily alternative prey. During summer, when age-0 gizzard shad became available as prey, saugeyes consumed similar proportions of gizzard shad and alternative prey. Saugeye cumulative consumptive demand in summer was high and approached the gizzard shad standing stock. However, during fall and winter, gizzard shad supply was adequate to support high (fall) or declining (winter) saugeye consumptive demand. Across reservoirs and seasons, saugeyes consumed alternative prey to varying degrees, primarily sunfishes Lepomis spp., yellow perch Perca flavescens, logperch Percina caprodes, and minnows Pimephales spp. Seasonal asynchrony between saugeye consumptive demand and gizzard shad biomass during spring and summer indicated that a saugeye population with high survival, growth, and consumptive demand will opportunistically increase use of prey other than gizzard shad. The manner in which saugeye predation quantitatively influences these prey species could not be assessed. However, overexploitation of gizzard shad prey appears to be unlikely at current saugeye population sizes, particularly considering the opportunistic use of alternative prey and the high reproductive potential of gizzard shad.

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“…The truncations were made at θ−3S θ and θ +3S θ , where θ and 3S θ denote the mean and standard deviation of the tilt angle, respectively. The relationship between TS and fish length 3,15) can be expressed as TS=m 10 log 10 SL+b…”

Section: )mentioning

confidence: 99%

Tilt Angle and Theoretical Target Strength of the Japanese Sandeel, <i>Ammodytes personatus</i>, Captured on the Northern Coast of Hokkaido

Safruddin

Kawauchi

Ito³

et al. 2013

jmasj

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Abstract:The tilt angle, i.e., the angle from horizontal made by the fish body as its head dives down or up, affects the readings on fish echo soundings. We measured the tilt angle of Japanese sandeels (Ammodytes personatus Girard) in a water tank, and calculated the acoustic target strength (TS) using a theoretical scattering model. This study examined the TS of sandeels from the northern coast of Hokkaido, which have a larger body size than those in other regions in Japan. TS values for sandeels, a swimbladderless fish, were estimated using a distorted-wave Born approximation (DWBA) model at two frequencies: 38 and 120 kHz. The mean tilt angle was 20.4° (S.D.=18.5°), which differed slightly from that of the lesser sandeel, Ammodytes marinus. The regression equations of the average TS values were TS 38 kHz =8.2 log 10 SL−74.2 and TS 120 kHz =20.9 log 10 SL−92.6, respectively. At 120 kHz, the slope was close to 20, suggesting that the acoustic backscattering strength was proportional to the square of the body length. This value was smaller at 38 kHz, suggesting that the acoustic backscattering strength was stable to differences in body length. We obtained a small discrepancy for both frequencies (ΔTS=TS 120 kHz −TS 38 kHz ) were TS 120 kHz

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Dorsal-Aspect Target Strength of an Individual Fish

Cited by 227 publications

References 6 publications

Application de l'hydroacoustique en milieu fluvial : exemple de l'étude de la montaison du saumon atlantique (Salmo salar L.) par sondage à double faisceau dans la rivière Moisie, Quebec

Application de l'hydroacoustique en milieu fluvial : exemple de l'étude de la montaison du saumon atlantique (Salmo salar L.) par sondage à double faisceau dans la rivière Moisie, Quebec

Seasonal Consumptive Demand and Prey Use by Stocked Saugeyes in Ohio Reservoirs

Tilt Angle and Theoretical Target Strength of the Japanese Sandeel, <i>Ammodytes personatus</i>, Captured on the Northern Coast of Hokkaido

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