| 摘要 |
A method and apparatus for the field rearing of planktonic larvae of marine animals involving suspending a field culture enclosure in oceanic tidal waters, stocking the enclosure with larvae of a preselected species of marine animal, permitting the enclosure to orient in response to the tidal flow of water, screening out larger plankton from entry into the enclosure and filtering water leaving the enclosure to impede the escape of the larvae and food plankton. The culture enclosure is suspended from floatation means and is equipped with a drop-rudder supported horizontally outwardly and spaced form the enclosure side The entry port has a plurality of deflection vanes to direct incoming water towards the enclosure periphery so that a substantially circular flow of water within the enclosure is achieved. By withdrawing water from the enclosure bottom a down-welling combines with the circular flow to cause food plankton and larvae to accumulate near the center and top of the enclosure. A filter bed over the enclosure bottom impedes the escape of larvae and food plankton while permitting moribund larvae and plankton, excretions and waste material to penetrate the bed and undergo bio-degradation thereby preventing the formation of an infectious bacterial scum on the enclosure bottom.
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