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The effect of size-grading juvenile Macrobrachium rosenbergii prior to stocking on their population structure and production in polyculture. I. Dividing the population into two fractions
Year:
1986
Source of publication :
aquaculture (source)
Authors :
Halevy, Amir H.
;
.
Hulata, Gideon
;
.
Karplus, Ilan
;
.
Wohlfarth, Giora W.
;
.
Volume :
56
Co-Authors:
Karplus, I., Agricultural Research Organization, Fish and Aquaculture Research Station, Dor, D.N. Hof Hacarmel 30820, Israel
Hulata, G., Agricultural Research Organization, Fish and Aquaculture Research Station, Dor, D.N. Hof Hacarmel 30820, Israel
Wohlfarth, G.W., Agricultural Research Organization, Fish and Aquaculture Research Station, Dor, D.N. Hof Hacarmel 30820, Israel
Halevy, A., Agricultural Research Organization, Fish and Aquaculture Research Station, Dor, D.N. Hof Hacarmel 30820, Israel
Facilitators :
From page:
257
To page:
270
(
Total pages:
14
)
Abstract:
Juvenile prawns were size-graded into an upper (one third of the population) and a lower (two thirds) fraction prior to stocking at a density of 2 per m2 into earthen ponds for a grow-out period of 105 days. Three graded and recombined control groups were included in this study. One control was of the same origin as the graded groups. The other two control groups consisted of larger and smaller prawns, similar in size to the graded upper and lower fractions. The effects of grading on morphotype differentiation, population structure and yield characteristics were analysed. At the end of the trial, the proportion of females was slightly higher than that of males in all of the groups. The males in the graded upper fraction consisted almost entirely of orange and blue claw males. This group had a 25% greater mean weight and yield than the controls. The graded lower fraction and the controls had a similar male morphotype composition consisting of 35-40% small males and approximately 60% orange and blue claw males. The graded lower fraction had a 10% lower mean weight and yield than the control. The three control groups were similar in mean weight and yield. Yields of the weighted combined upper and lower fractions and the controls were similar. The results of this study indicate that the relative position of juvenile prawns within the population is more important than absolute size in determining further growth rate and yield. © 1986.
Note:
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More details
DOI :
10.1016/0044-8486(86)90341-8
Article number:
0
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
19936
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:32
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Scientific Publication
The effect of size-grading juvenile Macrobrachium rosenbergii prior to stocking on their population structure and production in polyculture. I. Dividing the population into two fractions
56
Karplus, I., Agricultural Research Organization, Fish and Aquaculture Research Station, Dor, D.N. Hof Hacarmel 30820, Israel
Hulata, G., Agricultural Research Organization, Fish and Aquaculture Research Station, Dor, D.N. Hof Hacarmel 30820, Israel
Wohlfarth, G.W., Agricultural Research Organization, Fish and Aquaculture Research Station, Dor, D.N. Hof Hacarmel 30820, Israel
Halevy, A., Agricultural Research Organization, Fish and Aquaculture Research Station, Dor, D.N. Hof Hacarmel 30820, Israel
The effect of size-grading juvenile Macrobrachium rosenbergii prior to stocking on their population structure and production in polyculture. I. Dividing the population into two fractions
Juvenile prawns were size-graded into an upper (one third of the population) and a lower (two thirds) fraction prior to stocking at a density of 2 per m2 into earthen ponds for a grow-out period of 105 days. Three graded and recombined control groups were included in this study. One control was of the same origin as the graded groups. The other two control groups consisted of larger and smaller prawns, similar in size to the graded upper and lower fractions. The effects of grading on morphotype differentiation, population structure and yield characteristics were analysed. At the end of the trial, the proportion of females was slightly higher than that of males in all of the groups. The males in the graded upper fraction consisted almost entirely of orange and blue claw males. This group had a 25% greater mean weight and yield than the controls. The graded lower fraction and the controls had a similar male morphotype composition consisting of 35-40% small males and approximately 60% orange and blue claw males. The graded lower fraction had a 10% lower mean weight and yield than the control. The three control groups were similar in mean weight and yield. Yields of the weighted combined upper and lower fractions and the controls were similar. The results of this study indicate that the relative position of juvenile prawns within the population is more important than absolute size in determining further growth rate and yield. © 1986.
Scientific Publication
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