Over het archief
Het OWA, het open archief van het Waterbouwkundig Laboratorium heeft tot doel alle vrij toegankelijke onderzoeksresultaten van dit instituut in digitale vorm aan te bieden. Op die manier wil het de zichtbaarheid, verspreiding en gebruik van deze onderzoeksresultaten, alsook de wetenschappelijke communicatie maximaal bevorderen.
Dit archief wordt uitgebouwd en beheerd volgens de principes van de Open Access Movement, en het daaruit ontstane Open Archives Initiative.
Basisinformatie over ‘Open Access to scholarly information'.
Modified sorting technique to mitigate the collateral mortality of trawled school prawns (Metapenaeus macleayi)
Broadhurst, M.K.; Millar, R.B.; Brand, C.P.; Uhlmann, S.S. (2009). Modified sorting technique to mitigate the collateral mortality of trawled school prawns (Metapenaeus macleayi). Fish. Bull. 107(3): 286-297
In: Fishery Bulletin. US Government Printing Office: Washington, D.C.. ISSN 0090-0656; e-ISSN 1937-4518, meer
|   |
| Trefwoorden |
Population functions > Mortality
Prawns
Processing > Grading > Processing > Sorting
Sorting
Metapenaeus Wood-Mason in Wood-Mason & Alcock, 1891 [WoRMS]
Australia [Marine Regions]
Marien/Kust |
| Auteurs | | Top |
- Broadhurst, M.K.
- Millar, R.B.
- Brand, C.P.
- Uhlmann, S.S., meer
|
|
|
| Abstract |
The potential for changes to onboard handling practices in order to improve the fate of juvenile school prawns (Metapenaeus macleayi) discarded during trawling were investigated in two Australian rivers (Clarence and Hunter) by comparing a purpose-built, water-filled sorting tray against a conventional dry tray across various conditions, including the range of typical delays before the start of sorting the catch (2 min vs. 15 min). Juvenile school prawns (n=5760), caught during 32 and 16 deployments in each river, were caged and sacrificed at four times: immediately (T0), and at 24 (T24), 72 (T72), and 120 (T120) hours after having been discarded. In both rivers, most mortalities occurred between T0 and T24 and, after adjusting for control deaths (<12%). were greatest for the 15-min conventional treatment (up to 41% at T120). Mixed-effects logistic models revealed that in addition to the sampling time, method of sorting, and delay in sorting, the weight of the catch, salinity, and percentage cloud cover were significant predictors of mortality. Although trawling caused some mortalities and comparable stress (measured as L-lactate) in all school prawns, use of the water tray lessened the negative impacts of some of the above factors across both the 2-min and 15-min delays in sorting so that the overall discard mortality was reduced by more than a third. When used in conjunction with selective trawls, widespread application of the water tray should help to improve the sustainability of trawling for school prawns. |
IMIS is ontwikkeld en wordt gehost door het VLIZ.
