Crayfish Production: A Reflection of Community Energetics

Momot, Walter T.

doi:10.2307/1547894

Cited by 116 publications

(69 citation statements)

References 13 publications

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“…In general terms, larger females usually produce more eggs but for long-lived crayfish species, as A. pallipes, old females can show a reduced fecundity (MOMOT, 1984). According to this statement, we found a relatively low pleopodal egg production (less than 60) in big females (see Figure 1).…”

supporting

confidence: 54%

Pleopodal Egg Production of the White-Clawed Crayfish Austropotamobius Pallipes Lereboullet Under Laboratory Conditions: Relationship Between Egg Number, Egg Diameter and Female Size

Sáez‐Royuela¹,

Carral²,

Celada³

et al. 2006

Bull. Fr. Pêche Piscic.

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Reproductive data from a total number of 1296 adult white-clawed crayfish (864 females mean carapace length size 3.36 ± 0.49 cm and 432 males mean carapace length size 3.66 ± 0.38 cm) are reported. In a 10-year period, crayfish from wild populations caught in mid September were kept under indoor laboratory conditions where mating and spawning took place. Broodstock mortality was low: 5% in females and 1.1% in males. From the initial number of females, 771 mated (89.2%) and 721 spawned (83.4%). Pleopodal eggs were counted without removal between 3 and 20 days after spawning and mean number was 73.5 ± 34.1 (range 14-220). Egg diameter of 94 females was measured giving a mean value of 2.39 ± 0.015 mm (range 2.08-2.79 mm). Correlations between female size (carapace length CL), number of pleopodal eggs and egg diameter were made.Key-words: white-clawed crayfish, reproduction, fecundity. PRODUCTION DES OEUFS PLÉOPODAUX DE L'ÉCREVISSE À PIEDS BLANCS AUSTROPOTAMOBIUS PALLIPES LEREBOULLET DANS LES CONDITIONS DE LABORATOIRE : RELATION ENTRE LE NOMBRE D'OEUFS, LE DIAMÈTRE DES OEUFS ET LA TAILLE DE LA FEMELLE RÉSUMÉLes données reproductrices d'un nombre total de 1296 écrevisses à pieds blancs adultes (864 femelles avec une carapace de longueur moyenne de 3,36 ± 0,49 cm et 432 mâles avec une carapace de longueur moyenne de 3,66 ± 0,38 cm) sont incluses. Sur une période de 10 ans, des écrevisses de populations sauvages ont été capturées à la mi septembre et gardées en laboratoire où elles se sont accouplées et reproduites. La mortalité du stock de reproduction était faible: 5 % pour les femelles et 1,1 % pour les mâles. Sur le nombre initial de femelles, 771 se sont accouplées (89,2 %) et 721 ont frayé (83,4 %). Les oeufs pléopodaux ont été comptés sans élimination entre 3 et 20 jours après la fraie et le nombre moyen d'oeufs par femelle était de 73,5 ± 34,1 (intervalle de 14 à 220). Le diamètre des oeufs de 94 femelles a été mesuré, donnant une valeur moyenne de 2,39 ± 0,015 millimètre (intervalle de 2,08 à 2,79 millimètres). Les corrélations entre la taille de la femelle (CL, longueur de la carapace), le nombre d'oeufs pléopodaux et le diamètre des oeufs pléopodaux ont été calculées.

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supporting

confidence: 54%

Pleopodal Egg Production of the White-Clawed Crayfish Austropotamobius Pallipes Lereboullet Under Laboratory Conditions: Relationship Between Egg Number, Egg Diameter and Female Size

Sáez‐Royuela¹,

Carral²,

Celada³

et al. 2006

Bull. Fr. Pêche Piscic.

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“…Acting in concert with overexploitation, the loss of pristine riverine landscape seems to have been responsible for the local extinction of crayfish populations, at least in central Italy. Riparian vegetation is a source of allochthonous plant detritus, which is known to provide food to benthic consumers, including crayfish (Momot, 1984;Richardson, 1991;Nakano et al, 1999;Usio, 2000). In fact, although adult A. italicus seem to prefer moss in laboratory choice experiments (Gherardi et al, 2004), when their foraging behaviour was recorded in the field, they were most often observed visiting patches of coarse detritus and woody debris , vegetal material being the main item found in their gut (Gherardi et al, 2004).…”

Section: Discussionmentioning

confidence: 99%

Conserving indigenous crayfish: stock assessment and habitat requirements in the threatened Austropotamobius italicus

Brusconi¹,

Bertocchi²,

Renai³

et al. 2008

Aquatic Conservation

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ABSTRACT1. As part of the Austropotamobius pallipes species complex, the crayfish Austropotamobius italicus is a species of community interest whose preservation requires the designation of Special Areas of Conservation (SACs) (Annex II, EU Habitats Directive). This study aimed at (1) assessing the conservation status of this threatened indigenous species by stock assessment in Central Italy and (2) identifying some aspects of its elective habitat.2. Surveys were conducted in nine streams harbouring A. italicus (streams WI) and in 10 streams where crayfish populations became extinct at least 5 years before the study (streams WO).3. The results confirmed that A. italicus is a K-selected species, with a relatively slow growth rate (males: 0.34; females: 0.37) and a long life expectancy (males: 8.2 years, females: 7.8 years). The extant populations are healthy, showing balanced sex-ratios and well structured age-class compositions. Mortality is mainly due to fishing, which is illegal in Tuscany.4. Principal Components Analyses showed that the streams WI and WO differ in the abundance of allochthonous plant detritus but not in the taxonomic composition of their macroinvertebrate communities. Age classes were found to be spatially segregated, juveniles mainly using cobbles as substrates and adults seemingly avoiding them.5. The loss of the pristine riverine landscape seems to have been responsible, together with illegal fishing, for the local extinction of the species. As a consequence, retaining, enhancing, and restoring the habitat and its complexity are required for the preservation of A. italicus.6. The designation of SACs might help in this endeavour if accompanied by programmes aimed at publicizing the need for conservation of this species. Unfortunately, crayfish-focused projects supported by LIFE in Italy since 1992 (4%) and the SACs involved (1.4%) have been relatively few, despite the poor conservation status of this species and its well recognized ecological role.

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“…spinifrons al igual que muchas otras especies de astácidos dulce acuáticos, de climas fríos o de latitudes altas, está adaptado a regímenes alimenticios en forma de pulsos y por ende a bajos ingresos de energía (Momot, 1984(Momot, , 1991. Lo anterior implica una tasa de crecimiento muy baja.…”

Section: Crecimiento Lentounclassified

Cultivo de camaron de rio Samastacus spinifrons: ¿una nueva alternativa para la diversificacion de la acuicultura chilena?

Rudolph

Retamal

Martínez

2010

LAJAR

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RESUMEN. El camarón de río del sur Samastacus spinifrons, es una de las seis especies de la Familia Parastacidae (Crustacea, Decapoda, Astacidea) que habita las aguas dulces de Chile desde el río Aconcagua hasta la península de Taitao, y actualmente, la única que es considerada atractiva para la acuicultura nacional. En este artículo se revisa su potencial para la acuicultura con fines comerciales o de repoblamiento. Para ello se analizan: a) las ventajas y desventajas biológicas de esta especie ante eventuales actividades de cultivo en confinamiento; b) las experiencias de cultivo que a la fecha se han efectuado en Chile haciendo énfasis en sus respectivos aportes; y, c) las probables causas que han impedido que su cultivo se consolide en el país. Finalmente, de acuerdo a los análisis antes señalados se plantea una propuesta de cultivo que se considera la más adecuada para S. spinifrons. Palabras clave: Samastacus spinifrons, camarón de río, experiencias de cultivo, potencial para la acuicultura, Chile. Culturing freshwater crayfish Samastacus spinifrons: a new alternative for diversifying Chilean aquaculture?ABSTRACT. The freshwater crayfish Samastacus spinifrons, is one of six species of the Family Parastacidae (Crustacea, Decapoda, Astacidea) inhabiting freshwaters in Chile from the Aconcagua River to the Taitao Peninsula, and the only one that is currently considered attractive for national aquaculture. In this article, we review the potential of this species for aquaculture with commercial or restocking purposes. For this, we analyze: a) the species' biological advantages and disadvantages in an eventual situation of confined culture; b) previous culturing experiences carried out in Chile, with an emphasis on their respective contributions; and c) the causes that were likely to have prevented the consolidation of culturing this species in Chile. Finally, the above analyses provided the basis for our proposal of the most appropriate way to culture S. spinifrons.

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Crayfish Production: A Reflection of Community Energetics

Cited by 116 publications

References 13 publications

Pleopodal Egg Production of the White-Clawed Crayfish Austropotamobius Pallipes Lereboullet Under Laboratory Conditions: Relationship Between Egg Number, Egg Diameter and Female Size

Pleopodal Egg Production of the White-Clawed Crayfish Austropotamobius Pallipes Lereboullet Under Laboratory Conditions: Relationship Between Egg Number, Egg Diameter and Female Size

Conserving indigenous crayfish: stock assessment and habitat requirements in the threatened Austropotamobius italicus

Cultivo de camaron de rio Samastacus spinifrons: ¿una nueva alternativa para la diversificacion de la acuicultura chilena?

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