Occurrence and potential prediction of the giant jellyfish Nemopilema nomurai off Hyogo Prefecture, southwestern Sea of Japan, during 2006–2015

Tetsuya Nishikawa, Kazutaka Miyahara, Tetsuya Ohtani, Tomoharu Senjyu

Research output: Contribution to journalArticle

Abstract

We monitored the occurrences of giant jellyfish Nemopilema nomurai off Hyogo Prefecture, southwestern Sea of Japan, from 2006 to 2015. Occurrence data were collected from daily by-catch number of medusae at three large-scale set-nets operated in Hyogo Prefecture. In addition, we examined parameters to base predictions of outbreaks of N. nomurai using environmental factors measured at Amarube set-net and by-catch data of a preliminary offshore trawl survey. Annual by-catch number of N. nomurai medusae exceeding ten thousand in the three set-nets was observed in 2006, 2007 and 2009. On the other hand, no medusa was observed in 2014 and 2015, and the annual values were 2–147 in the other five years (2008 and 2010–2013). Salinity measured at the Amarube set-net decreased from June to August or September, and then increased in every year. The first detection time of N. nomurai medusa occurred within one week from the day when the salinity reached a minimum value for the year. It is thought that prediction of the occurrence timing of N. nomurai may become possible in the future by monitoring salinity data. The present study revealed that in the years when large amounts of medusae were caught in the offshore trawl survey, many medusae were also collected in the set-nets. For predicting the amount of N. nomurai medusae impacting coastal areas of Hyogo Prefecture, the use of catch data from offshore trawl surveys will enable early assessment of potential damage to fisheries.

Original languageEnglish
Pages (from-to)181-187
Number of pages7
JournalRegional Studies in Marine Science
Volume16
DOIs
Publication statusPublished - Nov 1 2017

Fingerprint

jellyfish
Scyphozoa
Sea of Japan
bycatch
catch statistics
salinity
prediction
environmental factor
fishery
fisheries
damage
environmental factors
monitoring
trawl nets
sea

All Science Journal Classification (ASJC) codes

  • Ecology, Evolution, Behavior and Systematics
  • Aquatic Science
  • Ecology
  • Animal Science and Zoology

Cite this

Occurrence and potential prediction of the giant jellyfish Nemopilema nomurai off Hyogo Prefecture, southwestern Sea of Japan, during 2006–2015. / Nishikawa, Tetsuya; Miyahara, Kazutaka; Ohtani, Tetsuya; Senjyu, Tomoharu.

In: Regional Studies in Marine Science, Vol. 16, 01.11.2017, p. 181-187.

Research output: Contribution to journalArticle

@article{b27ddcbc91a74b7eb0ad32845fe6bc9b,
title = "Occurrence and potential prediction of the giant jellyfish Nemopilema nomurai off Hyogo Prefecture, southwestern Sea of Japan, during 2006–2015",
abstract = "We monitored the occurrences of giant jellyfish Nemopilema nomurai off Hyogo Prefecture, southwestern Sea of Japan, from 2006 to 2015. Occurrence data were collected from daily by-catch number of medusae at three large-scale set-nets operated in Hyogo Prefecture. In addition, we examined parameters to base predictions of outbreaks of N. nomurai using environmental factors measured at Amarube set-net and by-catch data of a preliminary offshore trawl survey. Annual by-catch number of N. nomurai medusae exceeding ten thousand in the three set-nets was observed in 2006, 2007 and 2009. On the other hand, no medusa was observed in 2014 and 2015, and the annual values were 2–147 in the other five years (2008 and 2010–2013). Salinity measured at the Amarube set-net decreased from June to August or September, and then increased in every year. The first detection time of N. nomurai medusa occurred within one week from the day when the salinity reached a minimum value for the year. It is thought that prediction of the occurrence timing of N. nomurai may become possible in the future by monitoring salinity data. The present study revealed that in the years when large amounts of medusae were caught in the offshore trawl survey, many medusae were also collected in the set-nets. For predicting the amount of N. nomurai medusae impacting coastal areas of Hyogo Prefecture, the use of catch data from offshore trawl surveys will enable early assessment of potential damage to fisheries.",
author = "Tetsuya Nishikawa and Kazutaka Miyahara and Tetsuya Ohtani and Tomoharu Senjyu",
year = "2017",
month = "11",
day = "1",
doi = "10.1016/j.rsma.2017.09.002",
language = "English",
volume = "16",
pages = "181--187",
journal = "Regional Studies in Marine Science",
issn = "2352-4855",
publisher = "Elsevier BV",

}

TY - JOUR

T1 - Occurrence and potential prediction of the giant jellyfish Nemopilema nomurai off Hyogo Prefecture, southwestern Sea of Japan, during 2006–2015

AU - Nishikawa, Tetsuya

AU - Miyahara, Kazutaka

AU - Ohtani, Tetsuya

AU - Senjyu, Tomoharu

PY - 2017/11/1

Y1 - 2017/11/1

N2 - We monitored the occurrences of giant jellyfish Nemopilema nomurai off Hyogo Prefecture, southwestern Sea of Japan, from 2006 to 2015. Occurrence data were collected from daily by-catch number of medusae at three large-scale set-nets operated in Hyogo Prefecture. In addition, we examined parameters to base predictions of outbreaks of N. nomurai using environmental factors measured at Amarube set-net and by-catch data of a preliminary offshore trawl survey. Annual by-catch number of N. nomurai medusae exceeding ten thousand in the three set-nets was observed in 2006, 2007 and 2009. On the other hand, no medusa was observed in 2014 and 2015, and the annual values were 2–147 in the other five years (2008 and 2010–2013). Salinity measured at the Amarube set-net decreased from June to August or September, and then increased in every year. The first detection time of N. nomurai medusa occurred within one week from the day when the salinity reached a minimum value for the year. It is thought that prediction of the occurrence timing of N. nomurai may become possible in the future by monitoring salinity data. The present study revealed that in the years when large amounts of medusae were caught in the offshore trawl survey, many medusae were also collected in the set-nets. For predicting the amount of N. nomurai medusae impacting coastal areas of Hyogo Prefecture, the use of catch data from offshore trawl surveys will enable early assessment of potential damage to fisheries.

AB - We monitored the occurrences of giant jellyfish Nemopilema nomurai off Hyogo Prefecture, southwestern Sea of Japan, from 2006 to 2015. Occurrence data were collected from daily by-catch number of medusae at three large-scale set-nets operated in Hyogo Prefecture. In addition, we examined parameters to base predictions of outbreaks of N. nomurai using environmental factors measured at Amarube set-net and by-catch data of a preliminary offshore trawl survey. Annual by-catch number of N. nomurai medusae exceeding ten thousand in the three set-nets was observed in 2006, 2007 and 2009. On the other hand, no medusa was observed in 2014 and 2015, and the annual values were 2–147 in the other five years (2008 and 2010–2013). Salinity measured at the Amarube set-net decreased from June to August or September, and then increased in every year. The first detection time of N. nomurai medusa occurred within one week from the day when the salinity reached a minimum value for the year. It is thought that prediction of the occurrence timing of N. nomurai may become possible in the future by monitoring salinity data. The present study revealed that in the years when large amounts of medusae were caught in the offshore trawl survey, many medusae were also collected in the set-nets. For predicting the amount of N. nomurai medusae impacting coastal areas of Hyogo Prefecture, the use of catch data from offshore trawl surveys will enable early assessment of potential damage to fisheries.

UR - http://www.scopus.com/inward/record.url?scp=85029685974&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85029685974&partnerID=8YFLogxK

U2 - 10.1016/j.rsma.2017.09.002

DO - 10.1016/j.rsma.2017.09.002

M3 - Article

VL - 16

SP - 181

EP - 187

JO - Regional Studies in Marine Science

JF - Regional Studies in Marine Science

SN - 2352-4855

ER -