Publication Date:
2021-05-19
Description:
The object of this survey is to enhance maturation of Astacus leptodactylus by temperature modification in order to have juveniles in the starting period of crayfish culture and to reach an acceptable market size at the end of one period culture as well. The research initiated from 27 November 2000 and lasted on 21 November 2001 at safidrood shilati research station.
Crayfish brooders were catched by funnel trap from arass reservoir on late November 2000 and transferred to safidrood shilati researchstation , hold on concret pond as long as to observe eggs. Enhancing of the time of maturation conducted on one treatment and four replicate with raising temperature of the medium to 18-20 ºc .
Four replicate used for control under natural temperature which ranged between 13.3 to 20.4ºc with average 16.8ºc .
The dissolve oxygen concentration varied from 5.12 to 9.46 mg/l while Phof water were between 7.25 to 8.10 on mide April 2001. Egg development were observed on treatment which were one month earlier than control. Each crayfish produced 5 miniator with average individual weight of 50mg. The jovial of both treatment and control rared for seven days. Fed by dafni , chapped kilka and rice brain . To evaluate the relative growth between control and treatment, two soil pond with surface area of 100 m2 were used for the culture.
The duration of culture concerning to treatment was 210 dfays while for the control was 180 days.
Description:
Iranian Fisheries Science Research Institute
Description:
Published
Keywords:
Maturation
;
Astacus leptodactylus
;
Temperature
;
Survey
;
Crayfish
;
Culture
;
Brooders
;
Eggs
;
Dissolved oxygen
;
Growth
Repository Name:
AquaDocs
Type:
Report
,
Refereed
Format:
41pp.
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