Eel sea-ranching (Abstract)
Nielssen, L.; Mørk, H.; Bing, T. (1989). Eel sea-ranching (Abstract), in: De Pauw, N. et al. (Ed.) Aquaculture: a biotechnology in progress: volume 1. pp. 481
In: De Pauw, N. et al. (1989). Aquaculture: a biotechnology in progress: volume 1. European Aquaculture Society: Bredene. ISBN 90-71625-03-6. 1-592 pp., more
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Document type: Conference paper
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| Authors | | Top |
- Nielssen, L.
- Mørk, H.
- Bing, T.
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| Abstract |
Sea ranching of eels (Anguilla anguilla L.) in Denmark is a new discipline. In order to gain experience on how and where to stock eels, pilot stocking experiments were started in 1986. An important aspect in sea ranching is profitability. The aim of the experiments is to find the optimal method of sea ranching, i.e. a method minimizing stocking costs and maximizing the profit by high recaptures. In the pilot experiments cultivated small eels (fingerlings) and mass-reared elvers were stocked. The fingerlings originated from glass eels caught in France and the elvers originated from England. Approximately 12000 fingerlings, weighing from 10g to 50g, were released in two Danish fjords, the Urnfjord (8000 eels) and the Isefjord (4000 eels). At the time of release, late October 1986, the fingerlings were freeze-branded for identification. Due to the late date of release, no recaptures are expected before June 1987. The number and weight of recaptures will indicate if fingerlings cultivated in eel farms are suitable tor stocking. The experiment with elvers is a 3-year programme in which a new cultivation method using net cages is tested. The growth of the elvers from the net cages is compared with that of elvers from an eel farm with a warm-water recirculation system. Likewise the economic expenditures are compared. In late May 1986, 100kg of glass eels were imported from the River Severn in England, 50kg were cultivated in an eel farm with a warm-water recirculation system, and 5Okg were cultivated in net cages placed in a brackish-water fjord. |
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