The detection of dissolved amino acids by the Atlantic cod, <i>Gadus morhua</i> L.

Johnstone, Andrew

doi:10.1111/j.1095-8649.1980.tb02755.x

Cited by 26 publications

(17 citation statements)

References 34 publications

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“…In a study using a conditioning technique, Johnstone (1980) found that the detection thresholds of cod, Gudus morhuu L., to the most effective amino acids tested ranged from 2.5 x lo-' to 7-4 x l o -* M. Johnstone (1980) also gives a summary of comparable threshold determinations obtained for other species. With the exception of the threshold value for L-alanine (10 M) for channel catfish, Ictulurus punctutus Rafinesque, these thresholds are all more than two orders of magnitude higher than the value we found for food-deprived sablefish.…”

Section: Discussionmentioning

confidence: 95%

“…The active space of a bait source is an essential parameter in stock assessment models developed for estimation of fish populations, such as sablefish, that are harvested mainly by baited gears (McQuinn et al, 1988). Such information can also provide a better understanding of the process by which baited gears catch fish, and is important for improvements in gear selectivity (Lpkkeborg & Bjordal, 1992) and artificial bait development (Johnstone, 1980;L~kkeborg, 1990).…”

Section: Introductionmentioning

confidence: 98%

“…Some information on the sensitivity of the chemical senses of fishes caught with the aid of chemical lures has been obtained from electro-physiological studies (Sutterlin & Sutterlin, 1971;Suzuki & Tucker, 1971;Caprio, 1978), and from a study employing a classical conditioning technique (Johnstone, 1980). These studies determined detection thresholds for individual amino acids.…”

Section: Introductionmentioning

confidence: 99%

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Behavioural responses of sablefish, Anoplopoma fimbria, to bait odour

Løkkeborg

Olla²,

Pearson

et al. 1995

Journal of Fish Biology

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A behavioural bioassay was used to determine the response threshold to squid extract of sablefish, Anoplopoma fimbria, held at three different feeding regimens. Sablefish responded to the odour of bait by changing swimming activity and turning behaviour. The response threshold to bait odour was influenced by both the amount of food eaten and the duration of food deprivation. The total concentration of amino acids in the bait extract was assumed to determine the response threshold as chemical fractionation studies have shown that this class of compounds is essential for the stimulatory capacities of food extracts. When fed to satiation (9.4% wet body weight) and tested after one day of food deprivation, the mean response threshold to total dissolved free amino acids was 4.4 × 10−8m (range=7.6 × 10−8 to 3.6 × 10−8m). When fed at 1.6‐2.3% wet body weight, the threshold sensitivity had increased to a mean value of 1.8 × 10−10m (range=8.4 × 10−10 to 7.0 × 10−11m) after one day of food deprivation; after four days of deprivation, the sensitivity had increased even further to a mean value of 1.4 × 10−11m (range=1.6 × 10−10 to 1.4 × 10−12m). It was also apparent that the intensity of behavioural responses to the bait odour increased with both stimulus concentration and duration of food deprivation. These results suggest that sablefish intensify their search for prey under increased feeding motivation. The active space of a bait source was estimated from the threshold values obtained. Depending on state of food deprivation, rate of chemical release from the bait and the current velocity, maximum lengths of active space within which sablefish would exhibit food searching responses vary from 10 m to several km. Stock assessment based on catch data from baited gear will need techniques that take into account those factors influencing active space for food searching.

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Section: Discussionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Behavioural responses of sablefish, Anoplopoma fimbria, to bait odour

Løkkeborg

Olla²,

Pearson

et al. 1995

Journal of Fish Biology

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“…Although care should be taken with generalisations, some features of each of the systems seem to be consistent over a wide range of species. Based on its lower detection thresholds (Johnstone 1980;Ishida and Kobayashi 1992), olfaction is believed to initiate food search behaviour for a wide variety of odours, while the gustatory system seems to be more selective and provides the final sensory evaluation (i.e. odours may trigger food search, however the gustatory system may reject the object after tasting it) (Kasumyan and Døving 2003).…”

Section: Chemoreceptionmentioning

confidence: 99%

Towards more efficient longline fisheries: fish feeding behaviour, bait characteristics and development of alternative baits

Løkkeborg

Siikavuopio

Humborstad

et al. 2014

Rev Fish Biol Fisheries

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Better knowledge of food search behaviour in fish is essential for studies that aim to improve longline fishing, particularly through bait development. This review provides an overview of our understanding of how fish detect and locate sources of food odour, focusing on the stimuli and sensory modalities involved, and on factors that affect feeding activity. Studies that identify feeding attractants and efforts to develop alternative longline baits are presented. The review reveals that such studies are few in number, and that to date there are no alternatives to traditional baits in commercial longlining despite the growing demand for these resources, which are also used for human consumption. The chemical compounds that elicit food search behaviour differ from species to species, and species selectivity could be improved by incorporating specific feeding attractants in manufactured baits. The unique properties of chemical stimuli and odour dispersal form the basis for improving longline efficiency through the development of a long-lasting bait. Vision is important in prey capture, and manufactured baits can be made more visible than natural baits by increasing the contrast (e.g. via fluorescent or polarising coatings) and creating motion through buoyancy. Physical properties such as size, shape, texture and strength can also be manipulated in a manufactured bait to improve catch efficiency. Knowledge obtained from studies of various aspects of food search behaviour is of paramount importance for future research aimed at alternative bait development and improving longline fishing.

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“…There is a proportional increase in the concentration of stimulus required for detection as the background concentration rises (Johnstone, 1980). More studies on the effects of prolonged subthreshold-stimulus exposure are required.…”

Section: Released Behaviorsmentioning

confidence: 99%

Chemical Signals in Vertebrates 4

Doty¹,

Müller-Schwarze²

1986

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All rights reservedNo part of this book may be reproduced, stored in a retrieval system, or transmitted in any fonn or by any means, electronic, mechanical, photocopying, microfilming, recording, or otherwise, without written pennission from the Publisher v signals by humans (Doty) concludes the review. Needless to say, this field is more important than a single contribution can convey.As this collection of essays testifies, the exploration of chemical signals has become more firmly embedded in behavioral ecology and sociobiology. Current research has been stimulated by the studies of insect pheromones and is guided by evolutionary concepts.These papers were presented at the Fourth International Symposium on Chemical Signals in Vertebrates, held at the University of Wyoming, Laramie, from 27-30 July 1985. Our meeting was affiliated with the 10th International Symposium on Comparative Endocrinology, organized by Charles Ralph and held the previous week at Copper Mountain, Colorado. We thank the

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The detection of dissolved amino acids by the Atlantic cod, Gadus morhua L.

Cited by 26 publications

References 34 publications

Behavioural responses of sablefish, Anoplopoma fimbria, to bait odour

Behavioural responses of sablefish, Anoplopoma fimbria, to bait odour

Towards more efficient longline fisheries: fish feeding behaviour, bait characteristics and development of alternative baits

Chemical Signals in Vertebrates 4

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