Survey of environment and benthos in fisheries ground

Fiscal Year

2015

Title

Project and Theme

Project 1. Study on ecological succession of fisheries ground

Representative Organization: Tohoku University

Theme1. Environmental monitoring in coastal sea areas of Miyagi Prefecture

Representative person	Yoshinari Endo
Organization	Tohoku University
Department	Graduate School of Agricultural Science

Research Information

Period and Interval

2015/04/01 - 2016/03/31
monthly

Research Area

Southern Sanriku coast in Miyagi prefecture
0165_R01.pdf

Overview

The aim of this observation is to understand impacts on environments (sediment quality and benthos) by the tsunami in southern Sanriku coast. Specifically as follows. 1. Change of sediment quality in fisheries grounds 2. Ecological succession of benthic community in fisheries grounds 3. Monitoring of growth and survival of Japanese scallop as indicator of environments in fisheries grounds 4. Sellecting of suitable site for the farming of Japanese littleneck clam, Halocynthia roretzi and sea urchin

Overview of the Observation

Research Point Table

Point

Name	S1
Coordinates	38.37572,141.48647
Remarks	Samenoura
Name	St.24
Coordinates	38.41361,141.52169
Remarks	Onagawa
Name	St.25
Coordinates	38.4135,141.53731
Remarks	Onagawa
Name	S2
Coordinates	38.37593,141.49786
Remarks	Samenoura
Name	St.26
Coordinates	38.4135,141.56322
Remarks	Onagawa
Name	St.27
Coordinates	38.42149,141.48096
Remarks	Onagawa
Name	St.3
Coordinates	38.4295,141.4788
Remarks	Onagawa
Name	St.4
Coordinates	38.42365,141.49153
Remarks	Onagawa
Name	St.5
Coordinates	38.42363,141.50493
Remarks	Onagawa
Name	St.6
Coordinates	38.4237,141.52158
Remarks	Onagawa
Name	St.7
Coordinates	38.42398,141.53778
Remarks	Onagawa
Name	St.12
Coordinates	38.41193,141.48242
Remarks	Onagawa
Name	St.8
Coordinates	38.42397,141.56317
Remarks	Onagawa
Name	OA
Coordinates	38.56836,141.46733
Remarks	Oppa
Name	OB
Coordinates	38.57711,141.48644
Remarks	Oppa
Name	S3
Coordinates	38.37587,141.5093
Remarks	Samenoura
Name	OC
Coordinates	38.56325,141.49008
Remarks	Oppa
Name	OD
Coordinates	38.55107,141.4923
Remarks	Oppa
Name	OE
Coordinates	38.57783,141.50717
Remarks	Oppa
Name	OF
Coordinates	38.58857,141.51586
Remarks	Oppa
Name	OG
Coordinates	38.56107,141.52753
Remarks	Oppa
Name	O1
Coordinates	38.57721,141.47311
Remarks	Oppa
Name	St.16
Coordinates	38.43588,141.4777
Remarks	Onagawa
Name	O2
Coordinates	38.58419,141.49508
Remarks	Oppa
Name	O3
Coordinates	38.56534,141.50667
Remarks	Oppa
Name	O4
Coordinates	38.54325,141.50019
Remarks	Oppa
Name	O5
Coordinates	38.57836,141.53008
Remarks	Oppa
Name	S4
Coordinates	38.37593,141.52075
Remarks	Samenoura
Name	H
Coordinates	38.50225,141.50158
Remarks	Ogatsu
Name	O6
Coordinates	38.51558,141.48217
Remarks	Ogatsu
Name	O7
Coordinates	38.48708,141.51208
Remarks	Ogatsu
Name	0
Coordinates	38.518977,141.471403
Remarks	Ogatsu
Name	a
Coordinates	38.515593,141.482178
Remarks	Ogatsu
Name	St.17
Coordinates	38.43543,141.48842
Remarks	Onagawa
Name	b
Coordinates	38.508713,141.490555
Remarks	Ogatsu
Name	c
Coordinates	38.502263,141.501578
Remarks	Ogatsu
Name	d
Coordinates	38.495928,141.508605
Remarks	Ogatsu
Name	e
Coordinates	38.487075,141.512088
Remarks	Ogatsu
Name	f
Coordinates	38.479932,141.52402
Remarks	Ogatsu
Name	S5
Coordinates	38.37582,141.53214
Remarks	Samenoura
Name	g
Coordinates	38.473775,141.50787
Remarks	Ogatsu
Name	h
Coordinates	38.461998,141.507195
Remarks	Ogatsu
Name	i
Coordinates	38.450427,141.514052
Remarks	Ogatsu
Name	j
Coordinates	38.437212,141.514067
Remarks	Ogatsu
Name	St.2
Coordinates	38.4346,141.46818
Remarks	Onagawa
Name	1
Coordinates	38.56292,141.4581
Remarks	Nagatsura
Name	2
Coordinates	38.55522,141.46272
Remarks	Nagatsura
Name	3
Coordinates	38.55151,141.46739
Remarks	Nagatsura
Name	4
Coordinates	38.55143,141.46175
Remarks	Nagatsura
Name	5
Coordinates	38.55133,141.45858
Remarks	Nagatsura
Name	6
Coordinates	38.54729,141.46761
Remarks	Nagatsura
Name	S6
Coordinates	38.38374,141.50958
Remarks	Samenoura
Name	7
Coordinates	38.54732,141.46175
Remarks	Nagatsura
Name	8
Coordinates	38.54276,141.45853
Remarks	Nagatsura
Name	A
Coordinates	38.57543,141.46458
Remarks	Oppa
Name	St.20
Coordinates	38.43324,141.50483
Remarks	Onagawa
Name	A1
Coordinates	38.56997,141.46583
Remarks	Oppa
Name	B
Coordinates	38.56467,141.46728
Remarks	Oppa
Name	C
Coordinates	38.56292,141.4581
Remarks	Nagatsura
Name	D
Coordinates	38.55761,141.4603
Remarks	Nagatsura
Name	E
Coordinates	38.55527,141.46158
Remarks	Nagatsura
Name	N0
Coordinates	38.55522,141.46272
Remarks	Nagatsura
Name	N1
Coordinates	38.55333,141.46161
Remarks	Nagatsura
Name	S7
Coordinates	38.37103,141.49936
Remarks	Samenoura
Name	N10
Coordinates	38.54953,141.46752
Remarks	Nagatsura
Name	N11
Coordinates	38.54729,141.46761
Remarks	Nagatsura
Name	St.21
Coordinates	38.43324,141.52153
Remarks	Onagawa
Name	N12
Coordinates	38.54724,141.46475
Remarks	Nagatsura
Name	N13
Coordinates	38.54732,141.46175
Remarks	Nagatsura
Name	N14
Coordinates	38.54716,141.45858
Remarks	Nagatsura
Name	N15
Coordinates	38.54497,141.45855
Remarks	Nagatsura
Name	N16
Coordinates	38.54367,141.45647
Remarks	Nagatsura
Name	N17
Coordinates	38.54276,141.45853
Remarks	Nagatsura
Name	N17'
Coordinates	38.54073,141.4587
Remarks	Nagatsura
Name	N18
Coordinates	38.54508,141.46177
Remarks	Nagatsura
Name	St.1
Coordinates	38.44123,141.4586
Remarks	Onagawa
Name	N19
Coordinates	38.54552,141.46625
Remarks	Nagatsura
Name	St.22
Coordinates	38.43324,141.53739
Remarks	Onagawa
Name	N2
Coordinates	38.55331,141.46453
Remarks	Nagatsura
Name	N20
Coordinates	38.54393,141.46701
Remarks	Nagatsura
Name	N21
Coordinates	38.54568,141.46044
Remarks	Nagatsura
Name	N22
Coordinates	38.54436,141.45903
Remarks	Nagatsura
Name	N23
Coordinates	38.543,141.45747
Remarks	Nagatsura
Name	N3
Coordinates	38.55151,141.46739
Remarks	Nagatsura
Name	N4
Coordinates	38.55141,141.46464
Remarks	Nagatsura
Name	N5
Coordinates	38.55143,141.46175
Remarks	Nagatsura
Name	N6
Coordinates	38.55133,141.45858
Remarks	Nagatsura
Name	St.11
Coordinates	38.40182,141.4749
Remarks	Onagawa
Name	St.23
Coordinates	38.43319,141.56344
Remarks	Onagawa
Name	N7
Coordinates	38.54932,141.45858
Remarks	Nagatsura
Name	N8
Coordinates	38.54953,141.46172
Remarks	Nagatsura
Name	N9
Coordinates	38.54951,141.46466
Remarks	Nagatsura

Results and Future Plan

Tsunami-deposited mud was confirmed in the whole area in Onagawa bay. However, mud content and COD (an index of the organic matter) decreased gently after 2012 or 2013. On the other hand, the PCB decreased to less than detection limit level after the tsunami was detected at same level before the tsunami in 2015 and the other chemical substances such as heavy metal were also similar. There is a possibility that sediment included chemical substances(which existed in range of 10-15cm in depth) supplied in the surface on the seafloor with some cause, because the chemical substances were prohibited to product or regulated on emissions. Though the environment seemed to change to unsuitable habitat for macrobenthos, abundance of the macrobenthos tends to increase after the tsunami and the species composition is returning to the previous composition of the tsunami. Abundance of macrobenthos increased from the previous level of the tsunami off Onagawa Bay, where the mud did not deposit as high as in the bay. However, species composition have changed and not returned to the previous composition of the tsunami. It is possible that the macrobenthic community off Onagawa Bay was affected for a longer time than that in the bay, though the deposition of mud was low off Onagawa Bay. We continue to investigate the recovery processes.

Investigation Item and Data Acquisition

Investigation Item	Data Acquisition
Sediment quality	Grain size composition, COD, Toxic substance (TS, Cadmium, Chromium, Mercury, Organic phosphorus, PCB, Copper, Lead, Arsenic, Nickel, Ignition loss)
Macrobenthos	Species composition, biomass and distribution
Japanese scallop,Japanese littleneck clam, Halocynthia roretzi,sea urchin	Growth and survival

Reference

Related Observation Plan

FY2015 Survey of environment and benthos in fisheries ground

Related Observation Data

Phytoplankton Nagatsuraura 150707
Phytoplankton Ogatsubay 150707
Phytoplankton Oppabay 150706_0708
Phytoplankton Samenoura 150709
Zooplankton Nagatsuraura 150707
Zooplankton Ogatsubay 150707
Zooplankton Oppabay 150706_0708
Zooplankton Samenoura 150709
Nutrients-Chl.a Nagatsuraura 150707
Nutrients-Chl.a Ogatsubay 150707
Nutrients-Chl.a Oppabay 150706_0708
Nutrients-Chl.a Samenoura 150709
Distribution survey of wild population of Halocynthia roretzi_Distribution of ascidians at Sandoujisaki in Samenoura Bay
Distribution survey of wild population of Halocynthia roretzi_one year juvenile of H. roretzi on bottom block in Samenoura Bay
Distribution survey of wild population of Halocynthia roretzi_one year juvenile of H. roretzi on bottom block in Samenoura Bay (short)
Distribution survey of wild population of Halocynthia roretzi_Sakikamasaki in Samenoura Bay
Distribution survey of wild population of Halocynthia roretzi_Yoriisomarushimasaki in Samenoura Bay

Person in charge of Investigation

Representative person	Kenji Kaneko
Organization	Tohoku University
Department	Graduate School of Agricultural Science

Keywords

Fiscal Year	2015
Organization	Tohoku University
Category	Field survey
Research Area	South Sanriku
Discipline	Ocean physics -> Water temperature Ocean physics -> Salinity Ocean chemistry -> Dissolved oxygen Ocean chemistry -> Nutrients Ocean chemistry -> Organic matter Ocean environment -> Plant pigments Ocean environment -> Heavy metals Ocean environment -> Oil Ocean environment -> Organic carbon Ocean environment -> Organic nitrogen Ocean biology / Ocean ecology -> Biological classification Ocean biology / Ocean ecology -> Biomass Ocean biology / Ocean ecology -> Arthropods Ocean biology / Ocean ecology -> Mollusks

Survey of environment and benthos in fisheries ground

Fiscal Year

Title

Project and Theme

Project 1. Study on ecological succession of fisheries ground

Theme1. Environmental monitoring in coastal sea areas of Miyagi Prefecture

Research Information

Period and Interval

Research Area

Category

Overview

Overview of the Observation

Research Point Table

Results and Future Plan

Investigation Item and Data Acquisition

Reference

Related Observation Plan

Related Observation Data

Person in charge of Investigation

Keywords