Early and late effects of feed restriction on survival, growth and hepatopancreas structure in juveniles of the red claw crayfish Cherax quadricarinatus

The objective of this study is to estimate the point-of-reserve-saturation 50 (PRS50) of stage III (JIII) and 1-gram (J1g) juveniles of Cherax quadricarinatus and to evaluate the early and late effects of feeding restriction on survival, growth and hepatopancreas structure. The experiments consisted...

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Autores principales: Calvo, N.S., Stumpf, L., Pietrokovsky, S., Greco, L.S.L.
Formato: JOUR
Materias:
Cherax quadricarinatus
Growth
Hepatopancreas
Juveniles
Point-of-reserve-saturation
Survival
abnormality
crayfish
fishery production
freshwater ecosystem
growth rate
histology
juvenile
molt
nutritional status
survival
Animalia
Astacoidea
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00448486_v319_n3-4_p355_Calvo
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_00448486_v319_n3-4_p355_Calvo2023-10-03T14:51:51Z Early and late effects of feed restriction on survival, growth and hepatopancreas structure in juveniles of the red claw crayfish Cherax quadricarinatus Calvo, N.S. Stumpf, L. Pietrokovsky, S. Greco, L.S.L. Cherax quadricarinatus Growth Hepatopancreas Juveniles Point-of-reserve-saturation Survival abnormality crayfish fishery production freshwater ecosystem growth rate histology juvenile molt nutritional status survival Animalia Astacoidea Cherax quadricarinatus The objective of this study is to estimate the point-of-reserve-saturation 50 (PRS50) of stage III (JIII) and 1-gram (J1g) juveniles of Cherax quadricarinatus and to evaluate the early and late effects of feeding restriction on survival, growth and hepatopancreas structure. The experiments consisted of different feeding treatments followed by continuous starvation until molting to the following stage (restriction period). After molting, juveniles were fed daily until the end of the experiment (refeeding period). The PRS50 estimated for JIII was 2.05±0.11days, according to which 2 feeding days were required for 50% of the JIII to molt to JIV. However, the value of growth increment and the presence of hepatopancreatic abnormalities showed that these molted juveniles were not in optimal conditions. Their hepatopancreas showed a significant recovery during the refeeding period. This suggests that mortality in JIII exposed to a feeding restriction period close to the PRS50 occurs earlier than in the following stages and that the survivors recover after a refeeding period. The PRS50 of JIII could be used to test offspring quality, with the immediate advantage of reducing maintenance costs of poor-quality juveniles. The PRS50 estimated for J1g was 9.19±0.54days; those fed for less than 9days exhibited higher mortality during the restriction period, and those of F8 and F9 had histological abnormalities after the refeeding period. The mortality in J1g of F9 increased at the end of the experiment, suggesting that although they would be able to molt in a proportion similar to the control, they die later as a consequence of the restriction period. In this study, the relative wet hepatopancreas weight (RHW) was similar among treatments and between both experiments even when histological examination showed nutritional stress, implying that the RHW estimated with wet weight is a poor indicator of nutritional status. An adequate management in terms of reducing the amount of food and the use of proper tools for monitoring the health of cultured animals are essential for improving profits. In this context, the values of PRS50 and the information obtained from the present study are useful to establish a feeding schedule for the production of C. quadricarinatus. © 2011 Elsevier B.V. Fil:Calvo, N.S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Pietrokovsky, S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00448486_v319_n3-4_p355_Calvo
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Cherax quadricarinatus
Growth
Hepatopancreas
Juveniles
Point-of-reserve-saturation
Survival
abnormality
crayfish
fishery production
freshwater ecosystem
growth rate
histology
juvenile
molt
nutritional status
survival
Animalia
Astacoidea
Cherax quadricarinatus
spellingShingle Cherax quadricarinatus
Growth
Hepatopancreas
Juveniles
Point-of-reserve-saturation
Survival
abnormality
crayfish
fishery production
freshwater ecosystem
growth rate
histology
juvenile
molt
nutritional status
survival
Animalia
Astacoidea
Cherax quadricarinatus
Calvo, N.S.
Stumpf, L.
Pietrokovsky, S.
Greco, L.S.L.
Early and late effects of feed restriction on survival, growth and hepatopancreas structure in juveniles of the red claw crayfish Cherax quadricarinatus
topic_facet Cherax quadricarinatus
Growth
Hepatopancreas
Juveniles
Point-of-reserve-saturation
Survival
abnormality
crayfish
fishery production
freshwater ecosystem
growth rate
histology
juvenile
molt
nutritional status
survival
Animalia
Astacoidea
Cherax quadricarinatus
description The objective of this study is to estimate the point-of-reserve-saturation 50 (PRS50) of stage III (JIII) and 1-gram (J1g) juveniles of Cherax quadricarinatus and to evaluate the early and late effects of feeding restriction on survival, growth and hepatopancreas structure. The experiments consisted of different feeding treatments followed by continuous starvation until molting to the following stage (restriction period). After molting, juveniles were fed daily until the end of the experiment (refeeding period). The PRS50 estimated for JIII was 2.05±0.11days, according to which 2 feeding days were required for 50% of the JIII to molt to JIV. However, the value of growth increment and the presence of hepatopancreatic abnormalities showed that these molted juveniles were not in optimal conditions. Their hepatopancreas showed a significant recovery during the refeeding period. This suggests that mortality in JIII exposed to a feeding restriction period close to the PRS50 occurs earlier than in the following stages and that the survivors recover after a refeeding period. The PRS50 of JIII could be used to test offspring quality, with the immediate advantage of reducing maintenance costs of poor-quality juveniles. The PRS50 estimated for J1g was 9.19±0.54days; those fed for less than 9days exhibited higher mortality during the restriction period, and those of F8 and F9 had histological abnormalities after the refeeding period. The mortality in J1g of F9 increased at the end of the experiment, suggesting that although they would be able to molt in a proportion similar to the control, they die later as a consequence of the restriction period. In this study, the relative wet hepatopancreas weight (RHW) was similar among treatments and between both experiments even when histological examination showed nutritional stress, implying that the RHW estimated with wet weight is a poor indicator of nutritional status. An adequate management in terms of reducing the amount of food and the use of proper tools for monitoring the health of cultured animals are essential for improving profits. In this context, the values of PRS50 and the information obtained from the present study are useful to establish a feeding schedule for the production of C. quadricarinatus. © 2011 Elsevier B.V.
format JOUR
author Calvo, N.S.
Stumpf, L.
Pietrokovsky, S.
Greco, L.S.L.
author_facet Calvo, N.S.
Stumpf, L.
Pietrokovsky, S.
Greco, L.S.L.
author_sort Calvo, N.S.
title Early and late effects of feed restriction on survival, growth and hepatopancreas structure in juveniles of the red claw crayfish Cherax quadricarinatus
title_short Early and late effects of feed restriction on survival, growth and hepatopancreas structure in juveniles of the red claw crayfish Cherax quadricarinatus
title_full Early and late effects of feed restriction on survival, growth and hepatopancreas structure in juveniles of the red claw crayfish Cherax quadricarinatus
title_fullStr Early and late effects of feed restriction on survival, growth and hepatopancreas structure in juveniles of the red claw crayfish Cherax quadricarinatus
title_full_unstemmed Early and late effects of feed restriction on survival, growth and hepatopancreas structure in juveniles of the red claw crayfish Cherax quadricarinatus
title_sort early and late effects of feed restriction on survival, growth and hepatopancreas structure in juveniles of the red claw crayfish cherax quadricarinatus
url http://hdl.handle.net/20.500.12110/paper_00448486_v319_n3-4_p355_Calvo
work_keys_str_mv AT calvons earlyandlateeffectsoffeedrestrictiononsurvivalgrowthandhepatopancreasstructureinjuvenilesoftheredclawcrayfishcheraxquadricarinatus
AT stumpfl earlyandlateeffectsoffeedrestrictiononsurvivalgrowthandhepatopancreasstructureinjuvenilesoftheredclawcrayfishcheraxquadricarinatus
AT pietrokovskys earlyandlateeffectsoffeedrestrictiononsurvivalgrowthandhepatopancreasstructureinjuvenilesoftheredclawcrayfishcheraxquadricarinatus
AT grecolsl earlyandlateeffectsoffeedrestrictiononsurvivalgrowthandhepatopancreasstructureinjuvenilesoftheredclawcrayfishcheraxquadricarinatus
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