Hydrolytic Ability to Casein and Chitin of Bacteria Isolated From the Grass Prawn Rearing Water of Different Salinities

不同鹽度之草蝦池水細菌對酪蛋白及幾丁質水解能力之研究

黃美瑩(Mei-Ying Huang)

《臺灣水產學會刊》 19卷2期 (1992/06) Pp. 141-150

https://doi.org/10.29822/JFST.199206.0007

摘要

本文論述使用彩色顯示魚羣探測儀於1983～1984年期間對南海北部海域的海底囘聲映象實績考察。彩顯擴展圖象可以示出線度小於聲錐體底直徑的海底溝槽或孔穴；狹聲束比寬聲束有更眞實的海底地形；彩顯儀比具白線裝置之探魚儀有更優越的分辨性能；200 KHz、發射功率2 KW，6°聲束角能測深540 m，與理論計算値一致；使用高、低頻率採測同一水底可示出有否浮泥層覆蓋及其厚度；示出8級强風時船舶上抛的高度探測到採水器的回收過程。

關鍵字

鹽度 ； 草蝦池水 ； 細菌 ； 酷蛋白 ； 幾丁質 ； 水解能力

並列摘要

This paper describes echo tracers obtained by using a colour echo sounderin the northern South China Sea during 1983 to 1984.A depression on the sea floor was displayed on an expanded depth scaleby using a narrow acoustic beam which allows better delineation of bottomtopography than a wide beam.The colour display can discriminate dense fishschools against the bottom echo and is superior to a”white line”display.Using signals of 200 KHz and 2 KW in shallow water,returns could be obtainedfrom a sand-mud bottom to the designed depth of 540 m.Sometimes,it ispossible to determine whether the bottom is hard or soft.Thickness of alayer of mud on the seabed may be determined by comparing simultaneous200 KHz and 28 KHz echo tracers.When subjected to winds in excess of 34knots(k),vertical movements of the vessel had been observed on echo-sounderdisplays.Sampling action of a cast of Nansen bottles was recorded.

並列關鍵字

Salinities ； Grass Prawn Ponds ； Bacteria ； Casein ； Chitin ； Hydrolytic Ability