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פותח על ידי קלירמאש פתרונות בע"מ -
Fish larvae - Zooplankton relationships in microcosm simulations of earthen nursery ponds. I. Freshwater system
Year:
2006
Source of publication :
Aquaculture International
Authors :
הרפז, שנאן
;
.
מילשטיין, אנה
;
.
Volume :
14
Co-Authors:
Milstein, A., Fish and Aquaculture Research Station, Agricultural Research Organization, Dor, M.P. Hof HaCarmel 30820, Israel
Valdenberg, A., Kibbutz Maagan Michael, DN Manashe, Israel
Harpaz, S., Department of Aquaculture, Agricultural Research Organization, P.O. Box 6, Bet Dagan 50250, Israel
Facilitators :
From page:
231
To page:
246
(
Total pages:
16
)
Abstract:
To address the commercial nurseries problem of obtaining enough zooplankton of adequate species composition and size when fish larvae start to feed, a simulation of the effects of predation intensity on zooplankton composition in freshwater nursery ponds was carried out in an experimental system of twelve 130-liter containers. Treatments consisted of two densities (1 or 2 larvae l-1) of common carp stocked on the 4th day after filling the containers and a control without fish. Zooplankton-environment relationships were explored using factor analysis. Several groups of zooplankters that respond in different ways to fish larvae predation pressure were identified. The first factor was a general measurement of zooplankton abundance that mainly reflects allochthonous rotifer species that entered the system with the filling water, replaced in time by autochthonous species that hatched from resting eggs in the sediment. The second factor identified the direct effects of size selective fish predation, and the third showed indirect effects of high fish density. Larvae growth rate matched the plankton availability: high just after stocking, when they fed on the abundant but declining numbers of allochthonous rotifers; then decreased drastically and increased again when hatching of resting eggs of autochthonous rotifers and the availability of the crustacean preys preferred by the fish, increased. It was concluded that in commercial nurseries increased larvae production can be achieved just by stocking fish earlier than the 4th day after pond filling, to match the rotifer peak. © Springer Science+Business Media, Inc. 2006.
Note:
Related Files :
Cyprinus carpio
Ecology
feeding
fish culture
freshwater ecosystem
Management
nursery ground
pond
Zooplankton
עוד תגיות
תוכן קשור
More details
DOI :
10.1007/s10499-005-9006-1
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
20706
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:38
Scientific Publication
Fish larvae - Zooplankton relationships in microcosm simulations of earthen nursery ponds. I. Freshwater system
14
Milstein, A., Fish and Aquaculture Research Station, Agricultural Research Organization, Dor, M.P. Hof HaCarmel 30820, Israel
Valdenberg, A., Kibbutz Maagan Michael, DN Manashe, Israel
Harpaz, S., Department of Aquaculture, Agricultural Research Organization, P.O. Box 6, Bet Dagan 50250, Israel
Fish larvae - Zooplankton relationships in microcosm simulations of earthen nursery ponds. I. Freshwater system
To address the commercial nurseries problem of obtaining enough zooplankton of adequate species composition and size when fish larvae start to feed, a simulation of the effects of predation intensity on zooplankton composition in freshwater nursery ponds was carried out in an experimental system of twelve 130-liter containers. Treatments consisted of two densities (1 or 2 larvae l-1) of common carp stocked on the 4th day after filling the containers and a control without fish. Zooplankton-environment relationships were explored using factor analysis. Several groups of zooplankters that respond in different ways to fish larvae predation pressure were identified. The first factor was a general measurement of zooplankton abundance that mainly reflects allochthonous rotifer species that entered the system with the filling water, replaced in time by autochthonous species that hatched from resting eggs in the sediment. The second factor identified the direct effects of size selective fish predation, and the third showed indirect effects of high fish density. Larvae growth rate matched the plankton availability: high just after stocking, when they fed on the abundant but declining numbers of allochthonous rotifers; then decreased drastically and increased again when hatching of resting eggs of autochthonous rotifers and the availability of the crustacean preys preferred by the fish, increased. It was concluded that in commercial nurseries increased larvae production can be achieved just by stocking fish earlier than the 4th day after pond filling, to match the rotifer peak. © Springer Science+Business Media, Inc. 2006.
Scientific Publication
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