Basic movement pattern and chemo-oriented search towards baited pots in edible crab (Cancer pagurus L.)

Skajaa, Katrine; Fernö, Anders; Løkkeborg, Svein; Haugland, Eli Kyrkjebø

doi:10.1007/978-94-011-5090-3_18

Cited by 28 publications

(35 citation statements)

References 40 publications

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“…It is therefore plausible that the lobsters remained at the location because of a trap, particularly as three of the four prolonged periods (greater than 5 h) occurred within 24 h of trap deployment. The time spent within 20 m of a trap in this study ranged from 3 min to almost 17 h, similar to previous studies (10 min and 12 h [33,35]). However, direct comparisons are difficult due to the differing definitions of an approach [33,35].…”

Section: Behaviour and Movement In The Presence And Absence Of Trapssupporting

confidence: 89%

“…H. americanus [33] and C. pagurus [35], are more likely to approach traps at night, but there is no recorded relationship between the time of day and the probability of H. americanus entering a trap [32].…”

Section: Movement In Response To a Bait Sourcementioning

confidence: 99%

“…While these enclosed environments provide greater experimental control, they can lack realism and restrict movement. The distance over which a bait plume might be detected is determined by both the speed and direction of the current [34] and can vary considerably depending on the target animal [33,35,36]. Attempts to identify responses to bait sources have focussed on the orientation of individuals in relation to the prevailing current and have often resulted in uncertainty due to heterogenous conditions [33,35].…”

mentioning

confidence: 99%

“…Changes in behaviour in response to a trap have been identified by a notable change in direction [33], or by a change in speed [35] (C. pagurus). H. americanus has been previously shown to slow down when approaching an odour source; however, these experiments were undertaken within an aquarium and the scale of movements are not directly comparable [20].…”

mentioning

confidence: 99%

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Movement patterns of a commercially important, free-ranging marine invertebrate in the vicinity of a bait source

Lees

Mill

Skerritt³

et al. 2018

Anim Biotelemetry

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Background: Catch per unit effort is a cost-effective index of abundance and fishing effort, and an integral part of many fisheries stock assessments. Trap fisheries data are often generated using non-standardised methodology and the information to improve the accuracy of estimates is not always available due to current ecological knowledge gaps. Despite its economic importance, the European lobster Homarus gammarus has been relatively understudied compared to the closely related H. americanus. Previous studies investigating behaviour of Homarus spp. in relation to bait sources have been undertaken in aquariums or mesocosms rather than on free-ranging lobsters in the field. This study uses fine-scale acoustic telemetry data, and a null model approach to investigate free-ranging H. gammarus behaviour and movement in relation to baited commercial traps. Results:The distribution of lobsters n = 11 was largely similar in the presence and absence of traps. The time spent within 20 m of a trap ranged from 3 min to 16 h 55 min ( n = 27 ), and the distance at which lobsters began approaching a trap varied considerably (5.40 m to 125 m, n = 22 ); the mean distances were larger than calculated by previous studies. A fifth of trap approaches resulted in movement against the current indicating a potential olfactory response to a bait plume. A pre-existing non-random association with a trap location may increase the time spent near the trap and reduce the minimum distance between the lobster and the trap.Conclusions: This is the first study to assess the movement patterns of free-ranging H. gammarus in relation to a bait source. The larger approach distances in this study were likely due to the unrestricted ranging behaviour of the tagged lobsters. Aquarium and mesocosm studies provide greater experimental control, but may restrict movement and underestimate the area of bait influence. The use of null models to infer movement patterns of free-ranging lobsters has many advantages over aquarium-based studies. These include better highlighting of individual variability in behaviour, and the potential to elucidate the effects of bait plumes on catchability. Wider application of this approach can be used to improve estimates of catch and stock assessments.

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Section: Behaviour and Movement In The Presence And Absence Of Trapssupporting

confidence: 89%

Section: Movement In Response To a Bait Sourcementioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Movement patterns of a commercially important, free-ranging marine invertebrate in the vicinity of a bait source

Lees

Mill

Skerritt³

et al. 2018

Anim Biotelemetry

View full text Add to dashboard Cite

show abstract

“…Movement on hard, substrate will require larger turning angles and slower speeds due to the difficulties of traversing this substrate (Schippers et al 1996, Wiens et al 1997. However, as this is a non-linear response, it may also indicate increased foraging or searching behaviour (Skajaa et al 1998, Watson et al 1999, Patterson et al 2008. These findings suggest that population assessments will benefit from considering benthic composition and the likely resulting context specific behaviour of individuals.…”

Section: Movement Characteristics and Substrate-utilisationmentioning

confidence: 99%