נגישות
menu      
חיפוש מתקדם
תחביר
חפש...
הספר "אוצר וולקני"
אודות
תנאי שימוש
ניהול
קהילה:
אסיף מאגר המחקר החקלאי
פותח על ידי קלירמאש פתרונות בע"מ -
Effects of larger fish and size grading on growth and size variation in fingerling silver perch
Year:
2000
Source of publication :
Aquaculture International
Authors :
ברקי, אסף
;
.
הרפז, שנאן
;
.
חולתא, גדעון
;
.
קרפלוס, אילן
;
.
Volume :
8
Co-Authors:
Barki, A., Department of Aquaculture, Institute of Animal Science, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Harpaz, S., Department of Aquaculture, Institute of Animal Science, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Hulata, G., Department of Aquaculture, Institute of Animal Science, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Karplus, I., Department of Aquaculture, Institute of Animal Science, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Facilitators :
From page:
391
To page:
401
(
Total pages:
11
)
Abstract:
This study presents two experiments addressing growth and size variation in fingerling silver perch (Bidyanus bidyanus). In the first experiment, fish close to mean population size were raised either in the presence or absence of five larger fish for 60 days. Mean specific growth rate (SGR) and increases in the coefficient of variation and skewness were lower in the presence of larger fish, indicating a negative effect of large fish on the growth of smaller ones. In the second experiment, fingerlings were graded into groups smaller and larger than the median size of the population and raised in size-sorted groups of 60 large or small fish and mixed groups of 30 fish of each size category, for 60 days. There was no difference in mean SGR among groups, nor between the mixed group ad the weighted mean of the small and large groups. Biomass gain was higher in the mixed groups than in the weighted small and large groups, probably due to a slightly lower survival in the groups comprised of large fish. The fact that the effect of large fingerlings on the growth of smaller ones was evident in the first, but not the second, experiment may be attributed to higher size disparity between large and small fingerlings in the first experiment.
Note:
Related Files :
fish culture
Growth
growth rate
Silver perch (Bidyanus)
size distribution
Size grading
Size Variation
עוד תגיות
תוכן קשור
More details
DOI :
10.1023/A:1009274726380
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
21027
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:41
You may also be interested in
Scientific Publication
Effects of larger fish and size grading on growth and size variation in fingerling silver perch
8
Barki, A., Department of Aquaculture, Institute of Animal Science, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Harpaz, S., Department of Aquaculture, Institute of Animal Science, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Hulata, G., Department of Aquaculture, Institute of Animal Science, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Karplus, I., Department of Aquaculture, Institute of Animal Science, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Effects of larger fish and size grading on growth and size variation in fingerling silver perch
This study presents two experiments addressing growth and size variation in fingerling silver perch (Bidyanus bidyanus). In the first experiment, fish close to mean population size were raised either in the presence or absence of five larger fish for 60 days. Mean specific growth rate (SGR) and increases in the coefficient of variation and skewness were lower in the presence of larger fish, indicating a negative effect of large fish on the growth of smaller ones. In the second experiment, fingerlings were graded into groups smaller and larger than the median size of the population and raised in size-sorted groups of 60 large or small fish and mixed groups of 30 fish of each size category, for 60 days. There was no difference in mean SGR among groups, nor between the mixed group ad the weighted mean of the small and large groups. Biomass gain was higher in the mixed groups than in the weighted small and large groups, probably due to a slightly lower survival in the groups comprised of large fish. The fact that the effect of large fingerlings on the growth of smaller ones was evident in the first, but not the second, experiment may be attributed to higher size disparity between large and small fingerlings in the first experiment.
Scientific Publication
You may also be interested in