אסיף מאגר המחקר החקלאי

Autotrophic and heterotrophic production of micro-organisms in intensely-manured fish ponds, and related fish yields

Year:

1978

Source of publication :

Authors :

Volume :

14

Co-Authors:

Schroeder, G.L., Fish and Aquaculture Research Station, Dor, Israel

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Abstract:

Intensely-manured ponds produce 15-30 kg fish ha-1 day-1 with cow or chicken manure and nitrogen- and phosphate-rich fertilizers as the only nutritional inputs. The manure as it is supplied to the ponds is not a good fish food and does not produce good fish growth. Quantitative analysis shows that the production of all organisms, autotrophic and heterotrophic, pelagic and benthic, large enough to be used directly by the fish (i.e., larger than 37 microns) is adequate to account for less than half of the measured fish growth. Production within the microbial community that flourishes on and rapidly digests the manure organic matter is adequate to produce the measured fish growth. The fish appear to harvest the microorganisms at the level of bacteria and protozoa, by ingesting the small straw-like particles which comprise much of the manure and serve as the substrate for the microbial growth. © 1978.

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