Improved rotatory-flow technique applied to Cod (Gadus morrhua L.)

Lindahl, Per Eric; Olofsson, S.; Schwanbom, E.

doi:10.1016/0043-1354(76)90105-6

Cited by 10 publications

(7 citation statements)

References 6 publications

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“…102 a) When measuring moments the wing-plates are symmetrically arranged in relation to the tube with their surface plane perpendicular to the rotating movement of water . The fish, on the other hand, places itself asymmetrically in relation to the tube as soon as rotation starts, with its head near the left side wall of the tube and the tail fin near the right side wall (see Lindahl et al ., 1976) . The fore part and the hind part of the fish are thus exposed to a great turning force, whereas a small turning force acts on the middle part .…”

Section: Experiments Results and Discussionmentioning

confidence: 99%

“…min . -' is attained (Lindahl et al, 1976) . In this way the fish gradually exposes a larger and larger area (projection of the sagittal plane area) to the turning force .…”

Section: Experiments Results and Discussionmentioning

confidence: 99%

“…Instead results from experiments already published (Lindahl et al, 1976 ;& 1978 have been reexamined in the light of some new ideas .…”

Section: Methodsmentioning

confidence: 99%

“…The critical rev. min.-' at which the fish is just brought to rotate with the water is used as a measure of the ability of the fish to resist the torque working upon it (Lindahl & Schwanbom, 1971a, b) By using tubes of different widths for differently sized fish, it was possible to study samples of fish, comprising individuals of different size (Lindahl et al, 1976) . Using tubes of different width, the rotational velocity had to be expressed as critical peripheral velocity (rev .…”

Section: Introductionmentioning

confidence: 99%

“…the correlation between peripheral velocity and fish length was rather good (r = 0 .8) and the variation in the reaction quotients mostly satisfactorily low (Lindahl et al, 1976 ;Lindahl et al ., 1977 ;Olofsson & Lindahl, 1978) . The transformation of rev .…”

Section: Introductionmentioning

confidence: 99%

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Studies of force acting on fish in the rotatory flow apparatus

Olofsson

Lindahl

1978

Hydrobiologia

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Forces acting on symmetrically suspended wing-plates in the rotatory flow apparatus were measured at varied width and rev . min . -' of the rotating tubes . Force plotted as function of tube diameter (or length of wing-plate) gives a sigmoid curve above 40 to 5o rev . min . -' (called the force/ length curve) while the critical rev . min . -' for cod is about 70 . Features of the force-length curve may reasonably be expected to appear in plots of critical peripheral velocity against length of fish . Of the plots from 26 samples 73% showed features which are well compatible with those of the force/length curve .

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Section: Experiments Results and Discussionmentioning

confidence: 99%

“…min . -' is attained (Lindahl et al, 1976) . In this way the fish gradually exposes a larger and larger area (projection of the sagittal plane area) to the turning force .…”

Section: Experiments Results and Discussionmentioning

confidence: 99%

“…Instead results from experiments already published (Lindahl et al, 1976 ;& 1978 have been reexamined in the light of some new ideas .…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Studies of force acting on fish in the rotatory flow apparatus

Olofsson

Lindahl

1978

Hydrobiologia

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Fish bioassay monitoring of waste effluents

Schalie

Dickson

Westlake

et al. 1979

Environmental Management

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/ Spills of toxic materials into bodies Of water receiving industrial waste discharges can.be prevented only if frequent or.continuous assessments of effluent quality can be made. Currently available methods can automatically measure individual physical or chemical waste component s but cannot assess toxicity caused by the interaction of components or the presence of an unsuspected matedai. Aquatic organisms, in contrast, respond to their total environment and in this way integrate the effects of all 9 the va(4ous chemical and physical waste parameters.This study evaluates the possibility of using the continuously and automatically recorded responses of fish to monitor the toxicity of industrial waste effluents. A review of previously developed toxicity monitoring systems iS followed by a field evaluation of a method tha~t uses the computer-monitored ventilatory patterns of 12 bluegills (Lepomis macrochirusRafinesque) to monitor the toxicity of an industrial waste effluent as it flows into a river. No known tox!c.spills occurred in the effluent during the operation of this system, but acetone added to the effluent waste caused responses from the fish at concentrations which peaked near the 96-hr LC~o level. Some responses were also noted when no known toxicant was present; these were/elated to environmental disturbances and system design problems. Recommendations are made for the design of future biologic monitoring units.

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Temperature dependence of the effect of ethanol, as a model substance, on cod

Olofsson¹,

Lindahl²

1977

Environmental Research

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Improved rotatory-flow technique applied to Cod (Gadus morrhua L.)

Cited by 10 publications

References 6 publications

Studies of force acting on fish in the rotatory flow apparatus

Studies of force acting on fish in the rotatory flow apparatus

Fish bioassay monitoring of waste effluents

Temperature dependence of the effect of ethanol, as a model substance, on cod

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