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1962年大村湾に発生した赤潮現象と水産被害について


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Title: 1962年大村湾に発生した赤潮現象と水産被害について
Other Titles: On the Mass Mortality of Benthic Animals Occurred in the Season of Red Water, 1962.
Authors: 塩川, 司 / 立石, 賢 / 飯塚, 昭二 / 入江, 春彦
Authors (alternative): Shiokawa, Tsukasa / Tateishi, Masaru / Iizuka, Shoji / Irie, Haruhiko
Issue Date: Nov-1966
Publisher: 長崎大学水産学部
Citation: 長崎大学水産学部研究報告, v.21, pp.45-58; 1966
Abstract: In early September 1962, the flowering of Goniaulax polygramma broke out in the innermost parts of Omura Bay and consequently, the discoloration progressed rapidly to the neighboring waters, and at the end of September, the discoloration attained to the peak covering all over the Bay, In October, the swarms of microorganisms began gradually to ruin within Omura Bay and a part of the swarms flowed out separately to Sasebo Bay and disappeared there. Around that time, however, a mass mortality of commercial benthic animals happened. The amount of damaged ark shells(Anadara broughtonii) attained to 2,000 tons (1,700,000 individuals), and the stock of the other benthic animals, such as sea cucumbers, shrimps and fishes, was also remarkably decreased. However, the true cause of such a huge mortality could not have been detected due to insufficiency of surveys. It is the author's presumption from the various conditions, that the death of benthic animals is not directly related with the red water but with the depression of dissolved oxygen in the environmental waters at the bottom preceding to the red water. / 1962年の赤潮は9月上旬長与附近にまず発生したが,その本体は9月21~22日頃郡川地先に発生したもののようで,それらが漸次北上して10月初旬には佐世保湾にまん延し,10日頃消滅した. この赤潮は大型でしかも長期にわたったため,当時相当の被害を招来するものと心配されたが,養殖真珠にわずかに被害を与えたのみで終息した.しかしその後得た資料を整理すると,アカガイに約2,000トン,ナマコに少なくとも40トン,えびこぎ網の漁獲物のうちエヒ類に約40トン,魚類に20トン程度の被害を与えたものと推測される.しかしこれら被害は,赤潮による直接の被害ではなく,夏期大村湾中南部に形成された貧または無酸素に近い水塊によっておこったものと考えた. なお,この赤潮の主体種はGoniaulax polygrammaで,大村湾では始めて記録される種類である.出現濃度は海水1L当り106細胞が記録された.また,この種は水温25~28℃,比重22~23を至適環境条件とすることが推測されたが,特定の酸素量およびpHは要求しないものと思われる.
URI: http://hdl.handle.net/10069/31474
ISSN: 05471427
Type: Departmental Bulletin Paper
Text Version: publisher
Appears in Collections:第21号

Citable URI : http://hdl.handle.net/10069/31474

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