Observation on the Fish School Passing Through the Opening of Trawl Net

魚群通過拖網網口之觀察

周耀杰(Yau-Shou Chow) ； 黃燦星(Tsann-Shing Huang)

《臺灣水產學會刊》 17卷1期 (1990/03) Pp. 35-42

https://doi.org/10.29822/JFST.199003.0004

摘要

本研究係為了瞭解養殖循環系統在進行建立硝化作用及完成建立硝化作用後之各種水質化學變化情形，所得結果顯示：⒈添加3.7克亞硝酸鈉及100毫升硝化細菌液於此系統，需要18天活化硝酸菌至平衡狀態。繼續添加1.5克氯化銨和50毫升硝化細菌液，需要一星期活化亞硝酸菌。一個具較佳硝化作用之系統，卽使添加多量氨態氮，亦能有效地進行氧化作用，可以減少因多量亞硝酸產生之毒性的危險。2.添加0.3克至6.0克不同量之氯化銨於此活化循環系統，結果顯示硝化作用能在二十四小時內完成。而氨態氮氧化至亞硝酸-氮，亞硝酸-氮氧化至硝酸-氮，所需要的時間，隨添加氯化銨量的增加而增加。

關鍵字

漁獲效率 ； 魚類行為

並列摘要

This study was conducted to understand the water chemistry during andafter establishment of nitrification in a recirculating system.The resultsindicated:1.The activation of Nitrobacter population took 18 days to reach equilibriumwhile 3.7 g NaNO2 and 100ml of nitrifying bacteria were inoculated.It alsoshowed that more than one week was needed to activate Nitrosomonas by dailyaddition of 1.5 g NH4Cl and another 50 ml nitrifying bacteria to this system.A system with better efficiency of nitrification would reduce the risk of highnitrite toxicity even though a large quantity of ammonia-N was loaded tothe system.2.The nitrification could be completed within 24 hrs with different amountsof NH4Cl from 0.3 g to 6.0 g in this conditioned recirculating system.It tooklonger time to converse from ammonia-N to NO2-N,and from NO2-N to NO3-Nwith the increasing amount of NH4Cl.

並列關鍵字

Fishing Efficiency ； Fish Behaviour