Redefining the role of crayfish in aquatic ecosystems

Momot, Walter T.

doi:10.1080/10641269509388566

Cited by 443 publications

(315 citation statements)

References 77 publications

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“…This was also observed in our experiments where crayfish consumed more food in general after having consumed plant tissue which has a lower energetic value. Crayfish have been described as omnivores (Huxley, 1895), sometimes as predominantly herbivorous (Gaeveskaya, 1969;Scalici and Gibertini, 2007) or with a distinct preference for animal protein (Momot, 1995) or even shifting preferences depending on the age (Reynolds, 1998;Guan and Wiles, 1998). Our findings illustrate the heterogenic nature of crayfish diet with a clear preference for animal tissue.…”

Section: Discussionsupporting

confidence: 50%

“…Later studies observed a distinct preference for herbivorous food (Abrahamsson, 1966;Gaeveskaya, 1969). More recent publications, however, contradict the idea of crayfish being predominantly herbivorous, stating a distinct preference for animal protein (Momot, 1995;Guan and Wiles, 1998). Macroinvertebrates as well as fish, vegetal detritus and periphyton were all determined to be important components of a crayfish diet (Scalici and Gibertini, 2007).…”

Section: Introductionmentioning

confidence: 92%

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Assessing the importance of food for improving noble crayfish culture conditions

Rusch

Füreder

2015

Knowl. Manag. Aquat. Ecosyst.

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Key-words:species protection measures, feeding trials, food preference, crayfish culture, noble crayfish Captive breeding and crayfish culture are considered important measures in species protection activities. Thus, knowledge on optimal feeding of crayfish in captivity is needed in order to secure minimal mortality and prevent detrimental effects to health. To optimize conditions of crayfish prior to subsequent stocking, feeding trials were conducted with the aim of investigating the connection between food intake, food preference and temperature under near natural conditions. During a five-month period, noble crayfish were fed on fish, carrots, algae and chironomid-larvae according to a pre-defined rotation system, whereby the ambient water temperature ranged from 5 • C to 13 • C, following the natural temperature regime. The results of these feeding trials demonstrate a direct correlation between rising temperature and increasing food intake for water temperatures exceeding 8 • C. Food intake is further influenced by the variety of food items available at any one time. The results also confirm that Astacus astacus has a strong preference for fish and that alternation of food types has an impact on consumption. Our results prompt the following recommendations for optimized feeding conditions of crayfish in captivity prior to their release: (1) a balanced diet containing not only plant tissue but also a significant proportion of animal tissue and (2) the amount of available food must be adjusted according to the carapace length of the crayfish. RÉSUMÉÉvaluation de l'importance de la nourriture pour l'amélioration des conditions d'élevage d'écrevisses à pattes rouges Mots-clés :mesures de protection des espèces, L'élevage en captivité d'écrevisses est considéré comme une mesure importante dans les activités de protection des espèces. Ainsi, les connaissances sur l'alimentation optimale de l'écrevisse en captivité est nécessaire afin d'assurer un minimum de mortalité et prévenir les effets néfastes pour sa santé. Pour optimiser la condition de l'écrevisse avant le repeuplement ultérieur, des essais d'alimentation ont été menés dans le but d'étudier les liens entre la prise alimentaire, la préférence alimentaire et la température dans des conditions proches des conditions naturelles. Pendant une période de cinq mois, des écrevisses à pattes rouges

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Section: Discussionsupporting

confidence: 50%

Section: Introductionmentioning

confidence: 92%

Assessing the importance of food for improving noble crayfish culture conditions

Rusch

Füreder

2015

Knowl. Manag. Aquat. Ecosyst.

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“…Crayfish are considered to be influential organisms within many aquatic ecosystems, interacting with all trophic levels of the food web (Creed, 1994;Momot, 1995). The results of this study provide direct evidence to suggest that the implications of crayfish invasion are persistent and result in major changes to benthic invertebrate communities, although the effects on the community are stronger during autumn.…”

Section: Resultsmentioning

confidence: 70%

“…Hudina et al, 2012;Holdich et al, 2014;Kouba et al, 2014). They are one of the largest freshwater invertebrates, frequently dominating benthic faunal biomass where they occur (Lodge and Hill, 1994;Momot, 1995;Sousa et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

The long-term effects of invasive signal crayfish (Pacifastacus leniusculus) on instream macroinvertebrate communities

Mathers

Chadd

Dunbar

et al. 2016

Science of The Total Environment

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“…Freshwater crayfish are important members of littoral food webs. They affect freshwater communities at different trophic levels, alter physical habitat characteristics and are considered to be keystone species (Momot, 1995;Nyström, 2002). Non-indigenous freshwater crayfish species (NICS) may out-compete indigenous crayfish species (ICS) and severely disturb indigenous ecosystem functioning.…”

Section: Introductionmentioning

confidence: 99%

Understanding invasion success: life-history traits and feeding habits of the alien crayfishOrconectes immunis(Decapoda, Astacida, Cambaridae)

Chucholl

2012

Knowl. Managt. Aquatic Ecosyst.

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In the present study, the life history and diet of the highly successful North American invader Orconectes immunis was assessed for the first time in its introduced European range. In 2007, O. immunis population dynamics were monitored in a typical backwater habitat using unbaited funnel traps, and its life history was analysed using Von Bertalanffy's growth function. Juveniles hatched as early as March and may attain sexual maturity at the end of their first summer. The adult population moulted up to four times during the summer months, with the non-breeding form (II) lasting for a remarkably short time period. The high growth rate of O. immunis was combined with a short longevity, which was estimated at 2.5 years. The fecundity ranged from 119 to 495 pleopodal eggs. The stomach contents were dominated by detritus, followed by macroinvertebrates and macrophytes, and no ontogenetic shift in diet was observed. The ability to prey on a wide array of invertebrate taxa presumably supports the sustained high growth rate of O. immunis. The presented data provide evidence that O. immunis exhibits a strongly r-selected life history and omnivorous feeding habits. These ecological properties have often been linked to successful invaders and enhance the invasiveness of O. immunis.

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Redefining the role of crayfish in aquatic ecosystems

Cited by 443 publications

References 77 publications

Assessing the importance of food for improving noble crayfish culture conditions

Assessing the importance of food for improving noble crayfish culture conditions

The long-term effects of invasive signal crayfish (Pacifastacus leniusculus) on instream macroinvertebrate communities

Understanding invasion success: life-history traits and feeding habits of the alien crayfishOrconectes immunis(Decapoda, Astacida, Cambaridae)

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