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Shifting the natural spring-summer breeding season of the Australian freshwater crayfish Cherax quadricarinatus into the winter by environmental manipulations
Year:
2003
Source of publication :
aquaculture (source)
Authors :
Barki, Assaf
;
.
Hulata, Gideon
;
.
Karplus, Ilan
;
.
Volume :
220
Co-Authors:
Karplus, I., Department of Aquaculture, Agricultural Research Organization, P.O. Box 6, Bet-Dagan 50250, Israel
Gideon, H., Department of Aquaculture, Agricultural Research Organization, P.O. Box 6, Bet-Dagan 50250, Israel
Barki, A., Department of Aquaculture, Agricultural Research Organization, P.O. Box 6, Bet-Dagan 50250, Israel
Facilitators :
From page:
277
To page:
286
(
Total pages:
10
)
Abstract:
Ninety sexually mature Cherax quadricarinatus females were exposed to various combinations of photoperiod and temperature for 2 months during the summer. Females were randomly assigned to either "winter" "semi-winter" or "summer" simulation treatments. In the "winter" treatment, crayfish were exposed to a simulated winter photoperiod (gradual decrease from 14L:10D to 10L:14D, 4 weeks at short day length followed by gradual increase to 14L:10D) and temperature (gradual decrease from 27 to 15°C, held for 4 weeks, and then gradual increase to 27°C). In the "semi-winter" treatment, crayfish were exposed to a simulated winter photoperiod and a summer temperature (27-29°C). In the "summer" treatment, the crayfish were exposed to summer water temperatures and a photoperiod of 14L:10D. Following the 2 months of conditioning, the females were stocked for 7 months in small groups with males under environmental conditions similar to those of the "summer" treatment. All females were individually tagged and molting and spawning events were monitored. Females exposed to "semi-winter" conditioning in the summer, demonstrated a threefold increase in the rate of first spawning during the winter (December-February) compared with the other females. Crayfish breeders can easily implement these findings since shifting the breeding season into the winter only requires shortening of the photoperiod in the summer. The stocking of ponds in the spring with large nursed juveniles that hatched from eggs spawned in the winter, would allow the attainment of market size at the end of the limited growout season in temperate zones. © 2003 Elsevier Science B.V. All rights reserved.
Note:
Related Files :
aquaculture1 (domain1)
Astacoidea
Cherax
Crayfish
Redclaw
spawning
temperature
Trixis
Winter-simulation
Show More
Related Content
More details
DOI :
10.1016/S0044-8486(02)00225-9
Article number:
0
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
31427
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 01:02
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Scientific Publication
Shifting the natural spring-summer breeding season of the Australian freshwater crayfish Cherax quadricarinatus into the winter by environmental manipulations
220
Karplus, I., Department of Aquaculture, Agricultural Research Organization, P.O. Box 6, Bet-Dagan 50250, Israel
Gideon, H., Department of Aquaculture, Agricultural Research Organization, P.O. Box 6, Bet-Dagan 50250, Israel
Barki, A., Department of Aquaculture, Agricultural Research Organization, P.O. Box 6, Bet-Dagan 50250, Israel
Shifting the natural spring-summer breeding season of the Australian freshwater crayfish Cherax quadricarinatus into the winter by environmental manipulations
Ninety sexually mature Cherax quadricarinatus females were exposed to various combinations of photoperiod and temperature for 2 months during the summer. Females were randomly assigned to either "winter" "semi-winter" or "summer" simulation treatments. In the "winter" treatment, crayfish were exposed to a simulated winter photoperiod (gradual decrease from 14L:10D to 10L:14D, 4 weeks at short day length followed by gradual increase to 14L:10D) and temperature (gradual decrease from 27 to 15°C, held for 4 weeks, and then gradual increase to 27°C). In the "semi-winter" treatment, crayfish were exposed to a simulated winter photoperiod and a summer temperature (27-29°C). In the "summer" treatment, the crayfish were exposed to summer water temperatures and a photoperiod of 14L:10D. Following the 2 months of conditioning, the females were stocked for 7 months in small groups with males under environmental conditions similar to those of the "summer" treatment. All females were individually tagged and molting and spawning events were monitored. Females exposed to "semi-winter" conditioning in the summer, demonstrated a threefold increase in the rate of first spawning during the winter (December-February) compared with the other females. Crayfish breeders can easily implement these findings since shifting the breeding season into the winter only requires shortening of the photoperiod in the summer. The stocking of ponds in the spring with large nursed juveniles that hatched from eggs spawned in the winter, would allow the attainment of market size at the end of the limited growout season in temperate zones. © 2003 Elsevier Science B.V. All rights reserved.
Scientific Publication
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