Living things

Summary of research about striped mullet’s run up
2008
Contents
A lot of run up

2009

datetideage inTRWKR TRWSRmonth

datetideage inTRWKR TRWSRmonth

Feb.13rd

neap
tide

6.0

off

on

Jan.29th

middletide

2.8

Feb.23rd

spring 16.0
tide ～17.0

off

on

on

on

on

fishkill

returnMar.6thspringtide

28.0

Mar.20th

middletide

12.4

5th13terminate,6th10restart■When a lot of striped mullets run up?
A lot of stripe mullets run up on
Jan.29th 2009. It was about half month
faster than 2008.

off

onoff■Average daily temp.
20200715ٛ)ٛ(.10pme5
T0

70voN

70voN

70voN

70ce
D

70ce
D

70ceD

70ceD

2008
A lot of run up

80na
J

80na
J

80na
J

■Average monthly temp.
fiscal year
2007
2008

Nov.
12.5
12.2

Dec.
8.0
8.0

Jan.
5.1
5.3

Feb.
4.0

Mar.
10.4

80be
F

80be
F

80be
F

80raM

80raM

80ra
M

80rpA

80rpA

80rpA■How was the temperature?
Large different can’t be seen on
average monthly temperature
between 2007 with 2008.

Trend of tidal level when fish-kill in 2008
Feb.23rd ～Feb.24th 2008 spring tide～middle tide

A lot of run up of
stripe mullets
When low tide, sludgeof bottom is risen up.
It cause insufficientof “DO”.

May.5th ～May.6th 2008 spring tide

A lot of run up of
stripe mullets
When low tide, sludgeof bottom is risen up.
It cause insufficientof “DO”.

■What is thecause of fish-kill?
Insufficient ofdissolved
oxygen(DO) isseemed to because. The factor
be expected tocause of it are;・consumed ofDO by risen up
sludge.
・consumed ofDO by a lot of runup mullets.

Outline of reports of survey about striped mullets &great cormorant■Record of a lot of run up in 2009
・Jan.8th ,confirm of a lot of striped mullets, upstream of Nishiki bridge
・Jan.15th ,confirm of many great cormorants above Koshio bridge
・Jan.20th ,bevy of great cormorant moved to upstream, above Oto bridge,no striped mullets could be confirmed, some great cormorants werenear north western side of the Nagoya Castle
・Jan.23rd ,confirm of a lot of striped mullets around Nishiki bridge, confirm of alot of great cormorants above Tenma bridge
・Jan.29th confirm of a lot of striped mullets around Kitashimizu bridge, turning
bevy of great cormorant above Jyohoku bridge
・Jan.30th confirm of a lot of striped mullets around Sanage bridge, turning
bevy of great cormorant above Jyohoku bridge

For future
Transmit clean water from the Kiso riverHorikawa sennin chosatai 2010
■fixed-point survey groups■free survey groups■Horikawa cheering groups

The 1st ～4th stage

Horikawa RiverIts change compared with the beginningof TRWKR were;■improvement of water pollution■decrease of artificial garbage■increase of water-weed breeding area

Confirm of
these effect・Implementation of various civic activities→decrease of garbage by cleaning activities→increase of citizens hope making theHorikawa river clean■By beginning of TRWKR, progress of civic awareness andvisual effects (decrease of artificial garbage) were brought.
Next aim
・continuing civic cleaning activities andencouragement
・progress of cleaning awareness throughout allwatershed area

Our aim is;■revival of self clarification
capabilities of Horikawa River■creation of rich water environment

Eco-activities everyone can carry out
・to practice local production for local consumption
・never discharge cooking oil or dust into sewerage
・never discharge harmful emission into sewerage
・to avoid washing on rainy dayetc.