A COMPARISON OF SURVIVAL AND GROWTH IN JUVENILE ASTACUS LEPTODACTYLUS (ESCH.) AND PACIFASTACUS LENIUSCULUS (DANA) UNDER CONTROLLED CONDITIONS

The aim of this study was to compare survival and growth of juvenile narrow-clawed crayfish (Astacus leptodactylus) and signal crayfish (Pacifastacus leniusculus) fed only with experimental pellets (45% of proteins, 6% of fat, 20% crude fibre) under controlled conditions. The animals were reared in...
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Autor*in:	ULIKOWSKI D. [verfasserIn] KRZYWOSZ T. [verfasserIn] ŚMIETANA P. [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2006

Schlagwörter:	Astacus leptodactylus Pacifastacus leniusculus juveniles survival growth

Übergeordnetes Werk:	In: Knowledge and Management of Aquatic Ecosystems - EDP Sciences, 2010, (2006), 380-381, Seite 1245-1253
Übergeordnetes Werk:	year:2006 ; number:380-381 ; pages:1245-1253

Links:	Link aufrufen Link aufrufen Link aufrufen Journal toc

DOI / URN:	10.1051/kmae:2006023

Katalog-ID:	DOAJ004582934

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245	1	2	\|a A COMPARISON OF SURVIVAL AND GROWTH IN JUVENILE ASTACUS LEPTODACTYLUS (ESCH.) AND PACIFASTACUS LENIUSCULUS (DANA) UNDER CONTROLLED CONDITIONS
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520			\|a The aim of this study was to compare survival and growth of juvenile narrow-clawed crayfish (Astacus leptodactylus) and signal crayfish (Pacifastacus leniusculus) fed only with experimental pellets (45% of proteins, 6% of fat, 20% crude fibre) under controlled conditions. The animals were reared in 12 (50 l) circular plastic tanks, the narrow-clawed crayfish set-ups being designated A1 and A2, the signal crayfish set-ups P1 and P2. The initial stocking densities for each species were 600 (A1, P1) and 1,200 (A2, P2) juveniles stage 2 per square metre for each set-up in three replicates. The experiment lasted 92 days under continuous photoperiod (L:D 24:0; 100 LUX) conditions at a temperature of 22.0 ± 0.1°C and an oxygen saturation < 90%. One shelter (plastic tube) was provided for 2 crayfish in each set-up. The highest survival rate was obtained for signal crayfish from set-up P1 (47.5%), the lowest for narrow-clawed crayfish from set-up A2 (22.8%). Crayfish survival evidently depends on the stocking density: in set-ups A1 and P1 it was about 16% higher than in set-ups A2 and P2 (P < 0.05). Mortality was significantly higher (P < 0.05) in both species during the first 30 days of the experiment (48-77% of the total mortality) than during the subsequent two months of the experiment (< 20% of the total mortality). The final body size was the largest in narrow-clawed crayfish from set-up A1 (799 mg, 29.2 mm) and the smallest in signal crayfish from set-up P2 (534 mg, 26.5 mm). Specimens of narrow-clawed crayfish were larger than signal crayfish, and the specimens of both species in set-ups A1 and P1 were larger than those in set-ups A2 and P2. During the first 30 days of the experiment the specific growth rate (SGR) of both species in all set-ups was twice the value reported during the subsequent two months (P < 0.05).
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allfields	10.1051/kmae:2006023 doi (DE-627)DOAJ004582934 (DE-599)DOAJf9cda75910fe46ccabad14bfba5d00aa DE-627 ger DE-627 rakwb eng SH1-691 ULIKOWSKI D. verfasserin aut A COMPARISON OF SURVIVAL AND GROWTH IN JUVENILE ASTACUS LEPTODACTYLUS (ESCH.) AND PACIFASTACUS LENIUSCULUS (DANA) UNDER CONTROLLED CONDITIONS 2006 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The aim of this study was to compare survival and growth of juvenile narrow-clawed crayfish (Astacus leptodactylus) and signal crayfish (Pacifastacus leniusculus) fed only with experimental pellets (45% of proteins, 6% of fat, 20% crude fibre) under controlled conditions. The animals were reared in 12 (50 l) circular plastic tanks, the narrow-clawed crayfish set-ups being designated A1 and A2, the signal crayfish set-ups P1 and P2. The initial stocking densities for each species were 600 (A1, P1) and 1,200 (A2, P2) juveniles stage 2 per square metre for each set-up in three replicates. The experiment lasted 92 days under continuous photoperiod (L:D 24:0; 100 LUX) conditions at a temperature of 22.0 ± 0.1°C and an oxygen saturation < 90%. One shelter (plastic tube) was provided for 2 crayfish in each set-up. The highest survival rate was obtained for signal crayfish from set-up P1 (47.5%), the lowest for narrow-clawed crayfish from set-up A2 (22.8%). Crayfish survival evidently depends on the stocking density: in set-ups A1 and P1 it was about 16% higher than in set-ups A2 and P2 (P < 0.05). Mortality was significantly higher (P < 0.05) in both species during the first 30 days of the experiment (48-77% of the total mortality) than during the subsequent two months of the experiment (< 20% of the total mortality). The final body size was the largest in narrow-clawed crayfish from set-up A1 (799 mg, 29.2 mm) and the smallest in signal crayfish from set-up P2 (534 mg, 26.5 mm). Specimens of narrow-clawed crayfish were larger than signal crayfish, and the specimens of both species in set-ups A1 and P1 were larger than those in set-ups A2 and P2. During the first 30 days of the experiment the specific growth rate (SGR) of both species in all set-ups was twice the value reported during the subsequent two months (P < 0.05). Astacus leptodactylus Pacifastacus leniusculus juveniles survival growth Aquaculture. Fisheries. Angling KRZYWOSZ T. verfasserin aut ŚMIETANA P. verfasserin aut In Knowledge and Management of Aquatic Ecosystems EDP Sciences, 2010 (2006), 380-381, Seite 1245-1253 (DE-627)604078730 (DE-600)2502926-5 19619502 nnns year:2006 number:380-381 pages:1245-1253 https://doi.org/10.1051/kmae:2006023 kostenfrei https://doaj.org/article/f9cda75910fe46ccabad14bfba5d00aa kostenfrei http://dx.doi.org/10.1051/kmae:2006023 kostenfrei https://doaj.org/toc/1961-9502 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ SSG-OLC-PHA AR 2006 380-381 1245-1253
spelling	10.1051/kmae:2006023 doi (DE-627)DOAJ004582934 (DE-599)DOAJf9cda75910fe46ccabad14bfba5d00aa DE-627 ger DE-627 rakwb eng SH1-691 ULIKOWSKI D. verfasserin aut A COMPARISON OF SURVIVAL AND GROWTH IN JUVENILE ASTACUS LEPTODACTYLUS (ESCH.) AND PACIFASTACUS LENIUSCULUS (DANA) UNDER CONTROLLED CONDITIONS 2006 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The aim of this study was to compare survival and growth of juvenile narrow-clawed crayfish (Astacus leptodactylus) and signal crayfish (Pacifastacus leniusculus) fed only with experimental pellets (45% of proteins, 6% of fat, 20% crude fibre) under controlled conditions. The animals were reared in 12 (50 l) circular plastic tanks, the narrow-clawed crayfish set-ups being designated A1 and A2, the signal crayfish set-ups P1 and P2. The initial stocking densities for each species were 600 (A1, P1) and 1,200 (A2, P2) juveniles stage 2 per square metre for each set-up in three replicates. The experiment lasted 92 days under continuous photoperiod (L:D 24:0; 100 LUX) conditions at a temperature of 22.0 ± 0.1°C and an oxygen saturation < 90%. One shelter (plastic tube) was provided for 2 crayfish in each set-up. The highest survival rate was obtained for signal crayfish from set-up P1 (47.5%), the lowest for narrow-clawed crayfish from set-up A2 (22.8%). Crayfish survival evidently depends on the stocking density: in set-ups A1 and P1 it was about 16% higher than in set-ups A2 and P2 (P < 0.05). Mortality was significantly higher (P < 0.05) in both species during the first 30 days of the experiment (48-77% of the total mortality) than during the subsequent two months of the experiment (< 20% of the total mortality). The final body size was the largest in narrow-clawed crayfish from set-up A1 (799 mg, 29.2 mm) and the smallest in signal crayfish from set-up P2 (534 mg, 26.5 mm). Specimens of narrow-clawed crayfish were larger than signal crayfish, and the specimens of both species in set-ups A1 and P1 were larger than those in set-ups A2 and P2. During the first 30 days of the experiment the specific growth rate (SGR) of both species in all set-ups was twice the value reported during the subsequent two months (P < 0.05). Astacus leptodactylus Pacifastacus leniusculus juveniles survival growth Aquaculture. Fisheries. Angling KRZYWOSZ T. verfasserin aut ŚMIETANA P. verfasserin aut In Knowledge and Management of Aquatic Ecosystems EDP Sciences, 2010 (2006), 380-381, Seite 1245-1253 (DE-627)604078730 (DE-600)2502926-5 19619502 nnns year:2006 number:380-381 pages:1245-1253 https://doi.org/10.1051/kmae:2006023 kostenfrei https://doaj.org/article/f9cda75910fe46ccabad14bfba5d00aa kostenfrei http://dx.doi.org/10.1051/kmae:2006023 kostenfrei https://doaj.org/toc/1961-9502 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ SSG-OLC-PHA AR 2006 380-381 1245-1253
allfields_unstemmed	10.1051/kmae:2006023 doi (DE-627)DOAJ004582934 (DE-599)DOAJf9cda75910fe46ccabad14bfba5d00aa DE-627 ger DE-627 rakwb eng SH1-691 ULIKOWSKI D. verfasserin aut A COMPARISON OF SURVIVAL AND GROWTH IN JUVENILE ASTACUS LEPTODACTYLUS (ESCH.) AND PACIFASTACUS LENIUSCULUS (DANA) UNDER CONTROLLED CONDITIONS 2006 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The aim of this study was to compare survival and growth of juvenile narrow-clawed crayfish (Astacus leptodactylus) and signal crayfish (Pacifastacus leniusculus) fed only with experimental pellets (45% of proteins, 6% of fat, 20% crude fibre) under controlled conditions. The animals were reared in 12 (50 l) circular plastic tanks, the narrow-clawed crayfish set-ups being designated A1 and A2, the signal crayfish set-ups P1 and P2. The initial stocking densities for each species were 600 (A1, P1) and 1,200 (A2, P2) juveniles stage 2 per square metre for each set-up in three replicates. The experiment lasted 92 days under continuous photoperiod (L:D 24:0; 100 LUX) conditions at a temperature of 22.0 ± 0.1°C and an oxygen saturation < 90%. One shelter (plastic tube) was provided for 2 crayfish in each set-up. The highest survival rate was obtained for signal crayfish from set-up P1 (47.5%), the lowest for narrow-clawed crayfish from set-up A2 (22.8%). Crayfish survival evidently depends on the stocking density: in set-ups A1 and P1 it was about 16% higher than in set-ups A2 and P2 (P < 0.05). Mortality was significantly higher (P < 0.05) in both species during the first 30 days of the experiment (48-77% of the total mortality) than during the subsequent two months of the experiment (< 20% of the total mortality). The final body size was the largest in narrow-clawed crayfish from set-up A1 (799 mg, 29.2 mm) and the smallest in signal crayfish from set-up P2 (534 mg, 26.5 mm). Specimens of narrow-clawed crayfish were larger than signal crayfish, and the specimens of both species in set-ups A1 and P1 were larger than those in set-ups A2 and P2. During the first 30 days of the experiment the specific growth rate (SGR) of both species in all set-ups was twice the value reported during the subsequent two months (P < 0.05). Astacus leptodactylus Pacifastacus leniusculus juveniles survival growth Aquaculture. Fisheries. Angling KRZYWOSZ T. verfasserin aut ŚMIETANA P. verfasserin aut In Knowledge and Management of Aquatic Ecosystems EDP Sciences, 2010 (2006), 380-381, Seite 1245-1253 (DE-627)604078730 (DE-600)2502926-5 19619502 nnns year:2006 number:380-381 pages:1245-1253 https://doi.org/10.1051/kmae:2006023 kostenfrei https://doaj.org/article/f9cda75910fe46ccabad14bfba5d00aa kostenfrei http://dx.doi.org/10.1051/kmae:2006023 kostenfrei https://doaj.org/toc/1961-9502 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ SSG-OLC-PHA AR 2006 380-381 1245-1253
allfieldsGer	10.1051/kmae:2006023 doi (DE-627)DOAJ004582934 (DE-599)DOAJf9cda75910fe46ccabad14bfba5d00aa DE-627 ger DE-627 rakwb eng SH1-691 ULIKOWSKI D. verfasserin aut A COMPARISON OF SURVIVAL AND GROWTH IN JUVENILE ASTACUS LEPTODACTYLUS (ESCH.) AND PACIFASTACUS LENIUSCULUS (DANA) UNDER CONTROLLED CONDITIONS 2006 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The aim of this study was to compare survival and growth of juvenile narrow-clawed crayfish (Astacus leptodactylus) and signal crayfish (Pacifastacus leniusculus) fed only with experimental pellets (45% of proteins, 6% of fat, 20% crude fibre) under controlled conditions. The animals were reared in 12 (50 l) circular plastic tanks, the narrow-clawed crayfish set-ups being designated A1 and A2, the signal crayfish set-ups P1 and P2. The initial stocking densities for each species were 600 (A1, P1) and 1,200 (A2, P2) juveniles stage 2 per square metre for each set-up in three replicates. The experiment lasted 92 days under continuous photoperiod (L:D 24:0; 100 LUX) conditions at a temperature of 22.0 ± 0.1°C and an oxygen saturation < 90%. One shelter (plastic tube) was provided for 2 crayfish in each set-up. The highest survival rate was obtained for signal crayfish from set-up P1 (47.5%), the lowest for narrow-clawed crayfish from set-up A2 (22.8%). Crayfish survival evidently depends on the stocking density: in set-ups A1 and P1 it was about 16% higher than in set-ups A2 and P2 (P < 0.05). Mortality was significantly higher (P < 0.05) in both species during the first 30 days of the experiment (48-77% of the total mortality) than during the subsequent two months of the experiment (< 20% of the total mortality). The final body size was the largest in narrow-clawed crayfish from set-up A1 (799 mg, 29.2 mm) and the smallest in signal crayfish from set-up P2 (534 mg, 26.5 mm). Specimens of narrow-clawed crayfish were larger than signal crayfish, and the specimens of both species in set-ups A1 and P1 were larger than those in set-ups A2 and P2. During the first 30 days of the experiment the specific growth rate (SGR) of both species in all set-ups was twice the value reported during the subsequent two months (P < 0.05). Astacus leptodactylus Pacifastacus leniusculus juveniles survival growth Aquaculture. Fisheries. Angling KRZYWOSZ T. verfasserin aut ŚMIETANA P. verfasserin aut In Knowledge and Management of Aquatic Ecosystems EDP Sciences, 2010 (2006), 380-381, Seite 1245-1253 (DE-627)604078730 (DE-600)2502926-5 19619502 nnns year:2006 number:380-381 pages:1245-1253 https://doi.org/10.1051/kmae:2006023 kostenfrei https://doaj.org/article/f9cda75910fe46ccabad14bfba5d00aa kostenfrei http://dx.doi.org/10.1051/kmae:2006023 kostenfrei https://doaj.org/toc/1961-9502 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ SSG-OLC-PHA AR 2006 380-381 1245-1253
allfieldsSound	10.1051/kmae:2006023 doi (DE-627)DOAJ004582934 (DE-599)DOAJf9cda75910fe46ccabad14bfba5d00aa DE-627 ger DE-627 rakwb eng SH1-691 ULIKOWSKI D. verfasserin aut A COMPARISON OF SURVIVAL AND GROWTH IN JUVENILE ASTACUS LEPTODACTYLUS (ESCH.) AND PACIFASTACUS LENIUSCULUS (DANA) UNDER CONTROLLED CONDITIONS 2006 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The aim of this study was to compare survival and growth of juvenile narrow-clawed crayfish (Astacus leptodactylus) and signal crayfish (Pacifastacus leniusculus) fed only with experimental pellets (45% of proteins, 6% of fat, 20% crude fibre) under controlled conditions. The animals were reared in 12 (50 l) circular plastic tanks, the narrow-clawed crayfish set-ups being designated A1 and A2, the signal crayfish set-ups P1 and P2. The initial stocking densities for each species were 600 (A1, P1) and 1,200 (A2, P2) juveniles stage 2 per square metre for each set-up in three replicates. The experiment lasted 92 days under continuous photoperiod (L:D 24:0; 100 LUX) conditions at a temperature of 22.0 ± 0.1°C and an oxygen saturation < 90%. One shelter (plastic tube) was provided for 2 crayfish in each set-up. The highest survival rate was obtained for signal crayfish from set-up P1 (47.5%), the lowest for narrow-clawed crayfish from set-up A2 (22.8%). Crayfish survival evidently depends on the stocking density: in set-ups A1 and P1 it was about 16% higher than in set-ups A2 and P2 (P < 0.05). Mortality was significantly higher (P < 0.05) in both species during the first 30 days of the experiment (48-77% of the total mortality) than during the subsequent two months of the experiment (< 20% of the total mortality). The final body size was the largest in narrow-clawed crayfish from set-up A1 (799 mg, 29.2 mm) and the smallest in signal crayfish from set-up P2 (534 mg, 26.5 mm). Specimens of narrow-clawed crayfish were larger than signal crayfish, and the specimens of both species in set-ups A1 and P1 were larger than those in set-ups A2 and P2. During the first 30 days of the experiment the specific growth rate (SGR) of both species in all set-ups was twice the value reported during the subsequent two months (P < 0.05). Astacus leptodactylus Pacifastacus leniusculus juveniles survival growth Aquaculture. Fisheries. Angling KRZYWOSZ T. verfasserin aut ŚMIETANA P. verfasserin aut In Knowledge and Management of Aquatic Ecosystems EDP Sciences, 2010 (2006), 380-381, Seite 1245-1253 (DE-627)604078730 (DE-600)2502926-5 19619502 nnns year:2006 number:380-381 pages:1245-1253 https://doi.org/10.1051/kmae:2006023 kostenfrei https://doaj.org/article/f9cda75910fe46ccabad14bfba5d00aa kostenfrei http://dx.doi.org/10.1051/kmae:2006023 kostenfrei https://doaj.org/toc/1961-9502 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ SSG-OLC-PHA AR 2006 380-381 1245-1253
language	English
source	In Knowledge and Management of Aquatic Ecosystems (2006), 380-381, Seite 1245-1253 year:2006 number:380-381 pages:1245-1253
sourceStr	In Knowledge and Management of Aquatic Ecosystems (2006), 380-381, Seite 1245-1253 year:2006 number:380-381 pages:1245-1253
format_phy_str_mv	Article
institution	findex.gbv.de
topic_facet	Astacus leptodactylus Pacifastacus leniusculus juveniles survival growth Aquaculture. Fisheries. Angling
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container_title	Knowledge and Management of Aquatic Ecosystems
authorswithroles_txt_mv	ULIKOWSKI D. @@aut@@ KRZYWOSZ T. @@aut@@ ŚMIETANA P. @@aut@@
publishDateDaySort_date	2006-01-01T00:00:00Z
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The animals were reared in 12 (50 l) circular plastic tanks, the narrow-clawed crayfish set-ups being designated A1 and A2, the signal crayfish set-ups P1 and P2. The initial stocking densities for each species were 600 (A1, P1) and 1,200 (A2, P2) juveniles stage 2 per square metre for each set-up in three replicates. The experiment lasted 92 days under continuous photoperiod (L:D 24:0; 100 LUX) conditions at a temperature of 22.0 ± 0.1°C and an oxygen saturation < 90%. One shelter (plastic tube) was provided for 2 crayfish in each set-up. The highest survival rate was obtained for signal crayfish from set-up P1 (47.5%), the lowest for narrow-clawed crayfish from set-up A2 (22.8%). Crayfish survival evidently depends on the stocking density: in set-ups A1 and P1 it was about 16% higher than in set-ups A2 and P2 (P < 0.05). 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callnumber-first	S - Agriculture
author	ULIKOWSKI D.
spellingShingle	ULIKOWSKI D. misc SH1-691 misc Astacus leptodactylus misc Pacifastacus leniusculus misc juveniles misc survival misc growth misc Aquaculture. Fisheries. Angling A COMPARISON OF SURVIVAL AND GROWTH IN JUVENILE ASTACUS LEPTODACTYLUS (ESCH.) AND PACIFASTACUS LENIUSCULUS (DANA) UNDER CONTROLLED CONDITIONS
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topic_title	SH1-691 A COMPARISON OF SURVIVAL AND GROWTH IN JUVENILE ASTACUS LEPTODACTYLUS (ESCH.) AND PACIFASTACUS LENIUSCULUS (DANA) UNDER CONTROLLED CONDITIONS Astacus leptodactylus Pacifastacus leniusculus juveniles survival growth
topic	misc SH1-691 misc Astacus leptodactylus misc Pacifastacus leniusculus misc juveniles misc survival misc growth misc Aquaculture. Fisheries. Angling
topic_unstemmed	misc SH1-691 misc Astacus leptodactylus misc Pacifastacus leniusculus misc juveniles misc survival misc growth misc Aquaculture. Fisheries. Angling
topic_browse	misc SH1-691 misc Astacus leptodactylus misc Pacifastacus leniusculus misc juveniles misc survival misc growth misc Aquaculture. Fisheries. Angling
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title	A COMPARISON OF SURVIVAL AND GROWTH IN JUVENILE ASTACUS LEPTODACTYLUS (ESCH.) AND PACIFASTACUS LENIUSCULUS (DANA) UNDER CONTROLLED CONDITIONS
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title_full	A COMPARISON OF SURVIVAL AND GROWTH IN JUVENILE ASTACUS LEPTODACTYLUS (ESCH.) AND PACIFASTACUS LENIUSCULUS (DANA) UNDER CONTROLLED CONDITIONS
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author_browse	ULIKOWSKI D. KRZYWOSZ T. ŚMIETANA P.
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title_sort	comparison of survival and growth in juvenile astacus leptodactylus (esch.) and pacifastacus leniusculus (dana) under controlled conditions
callnumber	SH1-691
title_auth	A COMPARISON OF SURVIVAL AND GROWTH IN JUVENILE ASTACUS LEPTODACTYLUS (ESCH.) AND PACIFASTACUS LENIUSCULUS (DANA) UNDER CONTROLLED CONDITIONS
abstract	The aim of this study was to compare survival and growth of juvenile narrow-clawed crayfish (Astacus leptodactylus) and signal crayfish (Pacifastacus leniusculus) fed only with experimental pellets (45% of proteins, 6% of fat, 20% crude fibre) under controlled conditions. The animals were reared in 12 (50 l) circular plastic tanks, the narrow-clawed crayfish set-ups being designated A1 and A2, the signal crayfish set-ups P1 and P2. The initial stocking densities for each species were 600 (A1, P1) and 1,200 (A2, P2) juveniles stage 2 per square metre for each set-up in three replicates. The experiment lasted 92 days under continuous photoperiod (L:D 24:0; 100 LUX) conditions at a temperature of 22.0 ± 0.1°C and an oxygen saturation < 90%. One shelter (plastic tube) was provided for 2 crayfish in each set-up. The highest survival rate was obtained for signal crayfish from set-up P1 (47.5%), the lowest for narrow-clawed crayfish from set-up A2 (22.8%). Crayfish survival evidently depends on the stocking density: in set-ups A1 and P1 it was about 16% higher than in set-ups A2 and P2 (P < 0.05). Mortality was significantly higher (P < 0.05) in both species during the first 30 days of the experiment (48-77% of the total mortality) than during the subsequent two months of the experiment (< 20% of the total mortality). The final body size was the largest in narrow-clawed crayfish from set-up A1 (799 mg, 29.2 mm) and the smallest in signal crayfish from set-up P2 (534 mg, 26.5 mm). Specimens of narrow-clawed crayfish were larger than signal crayfish, and the specimens of both species in set-ups A1 and P1 were larger than those in set-ups A2 and P2. During the first 30 days of the experiment the specific growth rate (SGR) of both species in all set-ups was twice the value reported during the subsequent two months (P < 0.05).
abstractGer	The aim of this study was to compare survival and growth of juvenile narrow-clawed crayfish (Astacus leptodactylus) and signal crayfish (Pacifastacus leniusculus) fed only with experimental pellets (45% of proteins, 6% of fat, 20% crude fibre) under controlled conditions. The animals were reared in 12 (50 l) circular plastic tanks, the narrow-clawed crayfish set-ups being designated A1 and A2, the signal crayfish set-ups P1 and P2. The initial stocking densities for each species were 600 (A1, P1) and 1,200 (A2, P2) juveniles stage 2 per square metre for each set-up in three replicates. The experiment lasted 92 days under continuous photoperiod (L:D 24:0; 100 LUX) conditions at a temperature of 22.0 ± 0.1°C and an oxygen saturation < 90%. One shelter (plastic tube) was provided for 2 crayfish in each set-up. The highest survival rate was obtained for signal crayfish from set-up P1 (47.5%), the lowest for narrow-clawed crayfish from set-up A2 (22.8%). Crayfish survival evidently depends on the stocking density: in set-ups A1 and P1 it was about 16% higher than in set-ups A2 and P2 (P < 0.05). Mortality was significantly higher (P < 0.05) in both species during the first 30 days of the experiment (48-77% of the total mortality) than during the subsequent two months of the experiment (< 20% of the total mortality). The final body size was the largest in narrow-clawed crayfish from set-up A1 (799 mg, 29.2 mm) and the smallest in signal crayfish from set-up P2 (534 mg, 26.5 mm). Specimens of narrow-clawed crayfish were larger than signal crayfish, and the specimens of both species in set-ups A1 and P1 were larger than those in set-ups A2 and P2. During the first 30 days of the experiment the specific growth rate (SGR) of both species in all set-ups was twice the value reported during the subsequent two months (P < 0.05).
abstract_unstemmed	The aim of this study was to compare survival and growth of juvenile narrow-clawed crayfish (Astacus leptodactylus) and signal crayfish (Pacifastacus leniusculus) fed only with experimental pellets (45% of proteins, 6% of fat, 20% crude fibre) under controlled conditions. The animals were reared in 12 (50 l) circular plastic tanks, the narrow-clawed crayfish set-ups being designated A1 and A2, the signal crayfish set-ups P1 and P2. The initial stocking densities for each species were 600 (A1, P1) and 1,200 (A2, P2) juveniles stage 2 per square metre for each set-up in three replicates. The experiment lasted 92 days under continuous photoperiod (L:D 24:0; 100 LUX) conditions at a temperature of 22.0 ± 0.1°C and an oxygen saturation < 90%. One shelter (plastic tube) was provided for 2 crayfish in each set-up. The highest survival rate was obtained for signal crayfish from set-up P1 (47.5%), the lowest for narrow-clawed crayfish from set-up A2 (22.8%). Crayfish survival evidently depends on the stocking density: in set-ups A1 and P1 it was about 16% higher than in set-ups A2 and P2 (P < 0.05). Mortality was significantly higher (P < 0.05) in both species during the first 30 days of the experiment (48-77% of the total mortality) than during the subsequent two months of the experiment (< 20% of the total mortality). The final body size was the largest in narrow-clawed crayfish from set-up A1 (799 mg, 29.2 mm) and the smallest in signal crayfish from set-up P2 (534 mg, 26.5 mm). Specimens of narrow-clawed crayfish were larger than signal crayfish, and the specimens of both species in set-ups A1 and P1 were larger than those in set-ups A2 and P2. During the first 30 days of the experiment the specific growth rate (SGR) of both species in all set-ups was twice the value reported during the subsequent two months (P < 0.05).
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