Hiroshima Prefectural Farming Fisheries Center〒729-2313

Website address

185-12 Shinkai, Aza-Nishidaijo, Takasaki-cho,Takehara City, Hiroshima Prefecture Establishment
 Total construction cost

March 27, 1982
About 3.7 billion yen

Field trip date: year/month/day

Rotifers are live feeds (milk) forbaby fish (juvenile).
The size of each rotifer isapproximately 0.4 mm. 10
billion pieces of rotifers areneeded for baby fish every day.

Water tank rearing Japanese blue crab

Algae culture tankA type of phytoplankton called
Nannochloropsis is made (cultured) toincrease the number of rotifers. Its
size is 0.002 mm and it has green
color.

Seawater filtration apparatus
The seawater is used after being filtered in thefiltration apparatus. 12,000 tons (max.) per dayof seawater is used

Rotifer(Brachionus plicatilis sp.complex)

Oyster production building

Broodstock(adult) oyster

Seawater sterilization apparatus

Greasy-back prawn(Metapenaeus ensis)
Greasy-back prawn about
12 mm in body length

Japanese blue crab

Juvenile Japanese blue crab grown toreach 5 mm in body length,
They are released with the artificially-madealgae attached to the body.

The filtered seawater is further sterilized tomake the water clean for use in the rearing
tanks.
This is a special apparatus to sterilize
seawater with ultraviolet beam.

A staff member is measuring
the fish size.
The important thing in rearing
fish is to observe the juvenile
fish every day.

Oyster attachment facility
These are water tanks
where juvenile oysters
attach themselves to thestrings of scallop shells.
The strings with attachedjuvenile oysters are hungfrom the rafts to makethem grow.

Rearing tanks for Japanese rockfish, marbled rockfish, red sea bream, devil stinger, and sweetfish
A juvenile oyster

Juvenile devil stinger

Rearing facility for juvenile oysters

Automatic feeder

In addition torotifers, powdered
feed called “formulafeed” is given.

Automatic cleaner

The cleaner cleans up theresiduals of the feed settled
at the bottom of the watertank and dead fish, in orderto prevent disease fromspreading to other fish.

Juvenile oysters
Juvenile oysters are grown in tanks from theeggs until they are ready to attach to the rocks.
The size of a juvenile oyster is about 0.3 mm

The attached juveniles arereared for a period
between 14 and 20 days
being hung from the rafts.
They are shipped when
they grow to about 3 mm.

Species of fish reared in the Farming Fisheries Center(Planned production number of fish for FY2019)
RedspottedgrouperNumber of fishfor growing

73,000 pieces

Size
Period forgrowing
Intermediate
growing
Stocking(release) size

From Julyto October
Not applicable

Pacific oyster

Red sea bream

Japanese bluecrab

1.5 million
800,000
1.28 million pieces 2.072 million piecessheetspieces
Shell height single-piece
3 mm
10 mm
From March
From April to June From May to Julyto November

Not applicable
For aquaculture

ApplicableNot applicable

Greasy-back prawn

Sweetfish

Japanese rockfish

Devil stinger

Marbled rockfish

65,000pieces2.0 million pieces

316,000 pieces

495,000 pieces

388,000 pieces

From June to August

From September
to January

From January to April

From May
to September

From January
to April

Applicable

Applicable

ApplicableNot applicableNot applicable

810,000
piecesDirect stocking(releasing)Intermediate growing means to grow the juvenile fish grown in the Farming Fisheries Center in another place until they grow to reach a large size for stocking bastard halibut 376,000 pieces (stocking size 7 to 10 cm)