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image of Crustaceana

Third instar eastern white river crayfish, Procambarus acutus acutus (10 ± 0.04 mm TL), and red swamp crayfish, Procambarus clarkii (8 ± 0.02 mm TL) were stocked separately (intraspecific treatment) or in combination (interspecific treatment) at a density of 76 crayfish/m2 in 15-l aquaria. Survival and growth were assessed at 30-day intervals over a 90-day experimental period, which followed a fall (26-10°C), winter (10-10°C), and spring (10-26°C) temperature regime. A commercial crayfish feed (Zeigler 45-50% protein) was provided twice on five days a week. The survival of the two species was similar through the fall and winter temperature courses; however, survival of P. a. acutus was significantly greater than that of P. clarkii under the spring temperature regime. The survival of each species was also better in the intraspecific than in the interspecific treatment during the spring period. No significant difference was detected in the growth of both species through the fall and winter temperature regimes. Over the spring temperature course, Procambarus acutus acutus grew faster than Procambarus clarkii in both treatments. In contrast to P. a. acutus, P. clarkii grew faster in the interspecific treatment than in the intraspecific one. The overall growth of P. a. acutus was 14 to 21% higher than that of P. clarkii for the fall, winter, and spring temperature regime over the total of 90 days.

Des troisièmes stades d'écrevisses blanches de rivières de l'Est, Procambarus acutus acutus (10 ± 0, 04 mm TL) et d'écrevisses rouges de Louisiane, Procambarus clarkii (8 ± 0, 02 mm TL) ont été stockées séparément (traitement intraspécifique) ou en mélange (traitement interspécifique) à une densité de 76 écrevisses/m2 dans des aquariums de 15 l. La survie et la croissance ont été mesurées à des intervalles de 30 jours sur une période d'expérimentation de 90 jours, en suivant un régime de température d'automne (26-10°C), puis d'hiver (10-10°C) et de printemps (10-26° C). Une nourriture du commerce pour écrevisses (Zeigler 45-50% protéine) a été fournie deux fois sur cinq jours par semaine. La survie des deux espèces était similaire dans les conditions de température d'automne et d'hiver; cependant, la survie de P. a. acutus était significativement plus longue que celle de P. clarkii dans les conditions de température de printemps. La survie de chaque espèce était également meilleure dans le traitement intraspécifique que dans le traitement interspécifique

Affiliations: 1: Faculty of Fisheries, Mustafa Kemal University, TR-31040 Antakya-Hatay, Turkey;, Email:


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