3 resultados para Tire rubber

em Aquatic Commons


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In the Institute for Fishery Technology in Hamburg a new sorting grid for herring trawl fishery was developed which is more adapted to the commercial fishery than existing constructions. Therefore a flexible design was choosen with braided snoods as grid elements and rubber rings for shape stabilization. First tests were carried out with twin trawlers in the Western Baltic in February 1999. They proved principally the serviceability of this grid construction under commercial fishing conditions. The percentage of small sized herring was essentially reduced. Due to only few hauls more detailed quantitative statements are not possible yet.

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The maintenance of adequate dissolved oxygen level is very important in the economy of any aquaculture system. An easy to construct aerating device was created using 0.5 hp water-pump, shower rose, Styrofoam, and rubber hose. The aerator works by drawing water from below and discharging it into the atmosphere as a spray. The spray is aerated as it splashes into the water surface. The aerating device has an average spray of 1.2 unit and doubles the dissolved oxygen content of 37.8 m super(3) tank in one hour