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ผู้เขียน หัวข้อ: Micro-particles in recirculating aquaculture systems: microscopic examination of  (อ่าน 2484 ครั้ง)
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« เมื่อ: เมษายน 05, 2010, 09:59:49 AM »

Micro-particles in recirculating aquaculture systems: microscopic examination of particles

R. N. Patterson and K. C. Watts

Faculty of Engineering, Dalhousie University, P.O. Box 1000, Halifax, NS, Canada B3J 2X4
Received 28 July 2002;  accepted 15 January 2003. ; Available online 20 June 2003.

Abstract
In order to determine the composition, shape and structure of micro-particles in a cold water recirculating plant raising juvenile Atlantic salmon to the smolt stage, samples of suspended solids, collected on classification meshes, and samples of particles in the culture water were examined microscopically. Concurrent gravimetric tests were attempted which method proved unusable due to clogging of the meshes by a viscid material, especially for particles under 40 μm. It was determined that this viscid material, also evident on the classification screens, constituted a major portion of the less dense particles (1050 kg/m3) by floccing fine particles. Staining indicated that the viscid material was primarily mucus with some gelatinized starches from the feed. Undigested feed stirred in distilled, filtered water were also examined microscopically. Again a viscid coating was found on the filter media, but in this case the primary source appeared to be gelatinized starches. The lighter fraction was essentially absent. In both the culture water and the feed samples, the heavier fraction, 1150 kg/m3, appears to originate primarily from the heavy, brown, indigestible cellulose fraction of the ground wheat in the feed.

Author Keywords: Micro-particles in recirculating systems; Viscid material; Particle composition; Staining; Mucus

Aquacultural Engineering
Volume 28, Issues 3-4, August 2003, Pages 115-130
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