| 单词 | plankton indicator |
| 释义 | > as lemmasplankton indicator plankton indicator n. an apparatus that is towed behind a ship containing a filtering device by means of which the concentration of plankton can be estimated. ΘΚΠ the world > life > biology > collection or conservation of natural specimens > [noun] > equipment for collecting or preserving > of marine life keer-drag1836 plankton net1902 plankton indicator1925 plankton recorder1926 1925 A. C. Hardy in Fishery Investig. 2nd Ser. 8 vii. 2 The present paper..describes investigations by means of an instrument which has been called the Plankton Indicator. 1953 Bull. Marine Ecol. 4 19 The small Plankton Indicator..has been used..during an ecological survey of the herring off the north-east coast of Scotland. 1995 Sea Frontiers (Nexis) 22 June 32 In the early 1930s this device, or the Hardy Patent Plankton Indicator as it was called then, was patented, marketed, and sold to fishermen for about $15. < as lemmas |
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