Factors affecting the behavioural mechanisms of diet selection in fishes

Kaiser, Michel J.; Hughes, Roger N.

doi:10.1080/10236249309378860

Cited by 24 publications

(15 citation statements)

References 67 publications

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“…In this kind of sequential encounter, fish will attack or refuse a prey item depending upon its actual profitability and, in turn, prey profitability will be dependent on fish hunger levels and the characteristics of the prey (i.e. energy value, digestive kinetics or handling time; Croy & Hughes, 1991a; review by Kaiser & Hughes, 1993).…”

Section: Discussionmentioning

confidence: 99%

“…Learned foraging skills can have a strong influence on the profitability of prey that, being energetically favourable (i.e. having high energy content and/or low digestion times; see Nicieza et al, 1994b) are difficult to capture or ingest (Hughes & Croy, 1993;Kaiser & Hughes, 1993), and this could help to explain the change in the acceptance rates for Hydropsyche. In addition, this prey was presented with an unnatural appearance (without cover), and possibly this influenced prey recognition by masking some key trait related to shape, colour or movement style, as selection usually implies identification of specific visual features of prey (Croy & Hughes, 1991c;Stradmeyer, 1992;Langley, 1996).…”

Section: Discussionmentioning

confidence: 99%

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Prey selection by experienced and naive juvenile Atlantic salmon

Reiriz

Nicieza

Brañta

1998

Journal of Fish Biology

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Both in foraging groups and in a sequential prey encounter context, learning had a visible effect on the pattern of selection for three live prey types (Ecdyonurus larvae, Hydropsyche larvae, and Gammarus) by juvenile Atlantic salmon Salmo salar. Compared to wild-caught fish, naive, hatchery-reared fish that had not been exposed to natural prey ate Hydropsyche larvae in a remarkably low proportion, and consumed a higher proportion of Gammarus. Ecdyonurus experienced a high and rather steady predation rate across the experience gradient, but after a short period of experience with live prey the consumption rate for Hydropsyche increased drastically, and that of Gammarus decreased, matching the selection pattern exhibited by wild fish. Individual fish offered prey in a sequential encounter context increased consumption rates of all the prey types as they gained experience, but the improvement was higher for the prey that were less consumed initially. Fish became more selective as they approached satiation, conforming to the prediction of optimal foraging theory that higher predator's energy requirements, as well as low food availability, result in reduced selectivity. The results also suggest that fish from distinct populations can differ in the degree of diet selectivity according to their energetic requirements for growth. The fast learning response of Atlantic salmon parr towards novel prey probably allows fish to maintain a high foraging efficiency when faced with frequent changes in the availability of different prey types. 1998 The Fisheries Society of the British Isles

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Prey selection by experienced and naive juvenile Atlantic salmon

Reiriz

Nicieza

Brañta

1998

Journal of Fish Biology

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“…

Gut length, in particular, provides important information on species' feeding habits in almost all vertebrate classes, e.g., fishes (Kramer and Bryant 1995a); reptiles (O'Grady et al 2005); birds (e.g., Ricklefs 1996); and mammals (e.g., Chivers and Hladik 1980).

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confidence: 99%

Intestine Morphometrics of Fishes: A Compilation and Analysis of Bibliographic Data

Karachle¹,

Στεργίου²

2010

Acta Icth et Piscat

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In fishes, both external (e.g., shape, size and position of mouth, shape of caudal fin) and internal morphology (e.g., stomach shape and size, gut length: GL) provide important information on a species' feeding ecology (e.g., Keast and Webb 1966, Schmitt and Holbrook 1984, Kaiser and Hughes 1993, Juanes 1994, Juanes and Conover 1994, Hart 1997, Wootton 1998. Exploration of the relations between various feeding-related morphological characteristics with body length ** , such as body girth (e.g., Stergiou and Karpouzi 2003), mouth dimensions (horizontal and vertical mouth opening, gape area; e.g., Karpouzi and Stergiou 2003), and GL (e.g., Karachle and Stergiou 2006, 2007), are of great importance for understanding the biology and ecology of fishes (e.g., Peters 1983, Kramer and Bryant 1995a, b, Wootton 1998, Froese and Pauly 2000, as well as pinpointing the ecological role of a species in the aquatic food webs (e.g., Stergiou 2003, Froese and Pauly 2008).Gut length, in particular, provides important information on species' feeding habits in almost all vertebrate classes, e.g., fishes (Kramer and Bryant 1995a); reptiles (O'Grady et al. 2005); birds (e.g., Ricklefs 1996); and mammals (e.g., Chivers and Hladik 1980). In fishes, it can also be used as a reference point for interspecific comparisons (e.g., Al-Hussaini 1947). In this work, information on intestinal indices and relations between GL and body length and weight were compiled from the available bibliography. This data was related to species' feeding habits, fractional trophic level values (TROPHs) and taxonomy, as provided in FishBase (Froese and Pauly 2008), in order to identify possible patterns and correlations of feeding habits and evolutionary traits with intestinal growth. Background. The examination of morphological features related to feeding in fish, as well as their relation with body length, are of increasing scientific interest. In the present study, information on intestine (gut) morphometrics that appear in the relevant literature has been compiled, analysed, and discussed. Materials and Methods. Search of gut-related bibliography was conducted, using online literature databases on fish feeding and ecomorphology. The resulted data was tabulated. Relationships between mean, minimum, and maximum relative gut length (RGL) and intestine length weight index (ILW, Zihler's index), as provided by the original author, with species' fractional trophic levels (TROPHs; extracted from FishBase) were explored. Finally, using the relations between gut length (GL) and body length (L) provided by the original authors, regressions were reconstructed and compared based on species' feeding habits and taxonomy.Results. The amount of information related to gut morphometrics referred to 498 species. The relations between GL and L referred to 71 species, but four species were omitted from the analyses. Mean, minimum, and maximum RLG and ILW values were negatively related (for all cases: P < 0.01) with TROPH. The GL-L regressions performed for 67 species revealed ...

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“…The larger mouths of carnivores could be attributed mainly to: (a) adaptations of the structural capacity in order to meet with increasing energetic demands (Galis et al 1994) and (b) more effective handling and consumption of prey with large size (Scharf et al 2000, Pauly et al 2001. Indeed, according to the optimal foraging theory (Gerking 1994), carnivorous fishes that mainly feed with prey of high motility (e.g., other fishes) need to consume higher amounts of food or food of larger size in fewer feeding attempts, a fact that can be achieved by larger mouth gape and other adaptations (e.g., vision acuity, fast swimming and effective digestion; Keast & Webb 1966, Kaiser & Hughes 1993, Juanes 1994, Juanes & Conover 1994, Hart 1997, Wootton 1998, Fordham & Trippel 1999. On the other hand, there was no clear effect of habitat on mouth area.…”

Section: Discussionmentioning

confidence: 99%