Mortality and recovery of runt white sturgeon (Acipenser transmontanus) in a commercial farm in California, USA.
Identifieur interne : 000017 ( Ncbi/Checkpoint ); précédent : 000016; suivant : 000018Mortality and recovery of runt white sturgeon (Acipenser transmontanus) in a commercial farm in California, USA.
Auteurs : M P Georgiadis [États-Unis] ; R P Hedrick ; W O Johnson ; I A GardnerSource :
- Preventive veterinary medicine [ 0167-5877 ] ; 2000.
English descriptors
- KwdEn :
- MESH :
- economics : Aquaculture.
- growth & development : Fishes.
- Animal Diseases, Animals, Financial Management, Mortality, Survival Analysis.
Abstract
We investigated the effect of raising runt white sturgeon (Acipenser transmontanus) separately from dominant fish during the initial stages of grow-out in a commercial farm. Runt fish are poor-growers, have underdeveloped muscle mass, swim slowly and are more-frequently found at the top of the water column. The objective of the study was to describe the mortality and recovery rates (and their determinants) of white-sturgeon runts after separating them from dominant fish. Runt white sturgeon were stocked into twelve 2 m x 2 m rectangular tanks and graded periodically during a follow-up of 46-102 days. Overall mortality rates ranged from 0.3 to 7 dead fish per 1000 sturgeon-days at risk and overall recovery rates from 3.9 to 13.5 recovered fish per 1000 sturgeon-days at risk. Period-specific mortality and recovery rates increased over time. The period-specific mortality rates for all three periods were significantly higher for tanks of runts originating from grow-out tanks with high mortality (p-values: first period = 0.06; second period = 0.09; third period = 0.03), but were similar for tanks of runts of high- and low-mean initial weight. The period-specific recovery rates were significantly higher in runts originating from high-mortality grow-out tanks only for the third period (p = 0.05) but not the first and second periods (p-values = 0.33 and 0.25, respectively). Recovery rates were significantly higher in the higher-mean-weight runts tanks for the first and third period but not for the second (p-values: first period = 0.02; second period = 0.65; third period = 0.06). We concluded that the proportion of runts that recover during a 46-89 day period is substantial (16-58%); therefore, it might be worthwhile growing such fish separately in a fish farm for about three months. Financial analysis showed that this practice was profitable, if the value of white sturgeon fish for the farm exceeded $2.05 per kg.
PubMed: 10718495
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Runt fish are poor-growers, have underdeveloped muscle mass, swim slowly and are more-frequently found at the top of the water column. The objective of the study was to describe the mortality and recovery rates (and their determinants) of white-sturgeon runts after separating them from dominant fish. Runt white sturgeon were stocked into twelve 2 m x 2 m rectangular tanks and graded periodically during a follow-up of 46-102 days. Overall mortality rates ranged from 0.3 to 7 dead fish per 1000 sturgeon-days at risk and overall recovery rates from 3.9 to 13.5 recovered fish per 1000 sturgeon-days at risk. Period-specific mortality and recovery rates increased over time. The period-specific mortality rates for all three periods were significantly higher for tanks of runts originating from grow-out tanks with high mortality (p-values: first period = 0.06; second period = 0.09; third period = 0.03), but were similar for tanks of runts of high- and low-mean initial weight. The period-specific recovery rates were significantly higher in runts originating from high-mortality grow-out tanks only for the third period (p = 0.05) but not the first and second periods (p-values = 0.33 and 0.25, respectively). Recovery rates were significantly higher in the higher-mean-weight runts tanks for the first and third period but not for the second (p-values: first period = 0.02; second period = 0.65; third period = 0.06). We concluded that the proportion of runts that recover during a 46-89 day period is substantial (16-58%); therefore, it might be worthwhile growing such fish separately in a fish farm for about three months. Financial analysis showed that this practice was profitable, if the value of white sturgeon fish for the farm exceeded $2.05 per kg.</div></front></TEI><affiliations><list><country><li>États-Unis</li></country></list><tree><noCountry><name sortKey="Gardner, I A" sort="Gardner, I A" uniqKey="Gardner I" first="I A" last="Gardner">I A Gardner</name><name sortKey="Hedrick, R P" sort="Hedrick, R P" uniqKey="Hedrick R" first="R P" last="Hedrick">R P Hedrick</name><name sortKey="Johnson, W O" sort="Johnson, W O" uniqKey="Johnson W" first="W O" last="Johnson">W O Johnson</name></noCountry><country name="États-Unis"><noRegion><name sortKey="Georgiadis, M P" sort="Georgiadis, M P" uniqKey="Georgiadis M" first="M P" last="Georgiadis">M P Georgiadis</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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