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Title Transcription
ナカウミ ニ オケル ミズクラゲ ノ ブンプ ト セイチョウ ヨホウ
Title Alternative (English)
Spatial distribution and growth of Jellyfish Aurelia aurita (Linnaeus)
File
language
jpn
Author
Hiyama, Morio
Miyamoto, Yasushi
Description
In the recent brackish lagoon Lake Nakaumi, the basic ecological insights of jellyfish
are needed to be clarified since their nuisance to fisheries is becoming serious. Here, we conducted field observations in order to clarify spatial distribution and growth patterns of Aurelia aurita (Linnaeus) in brackish lagoon Lake Nakaumi. We counted medusa visually in ca. 5×5m surface water and measured their diameter at six sites in May, August, September, and October. The observations detected that the medusa diameter significantly larger in August than May, however, not differed among August, September, and October, in addition, two peaks in the size distribution in May became one peak after August with disappearing larger size class. These suggest that major growth of medusa occurs during spring to early summer and that recruitment of pelagic medusa from benthic polyp occurs before spring. The observations also found that the medusa distributed in an aggregative manner, and the aggregation became more intense as wind velocity became larger. The results provide us basic ecological insights of jellyfish, however, our findings could not cover all of the fishermen’s findings, such as the wind direction dependent aggregation pattern and the depth distribution. In order to provide useful suggestions for fisheries, continuous research is needed.
Subject
Jellyfish
Aurelia auria (Linnaeus)
spatial distribution
size distribution
Journal Title
Laguna : 汽水域研究
Volume
16
Start Page
1
End Page
6
ISSN
21852995
Published Date
2009-06
NCID
AN10439529
Publisher
島根大学汽水域研究センター
NII Type
Departmental Bulletin Paper
Format
PDF
Text Version
出版社版
OAI-PMH Set
Estuary Research Center
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