A population dynamics model for Japanese sardine, Sardinops melanostictus, off the Pacific coast of Japan, consisting of spatial early-life stage and age-structured adult sub-models Maki Suda, Tatsuro Akamine and Hiroshi Nishida National Research Institute of Fisheries Science, Fisheries Research Agency
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A population dynamics model for Japanese sardine ... · A population dynamics model for Japanese sardine, Sardinops melanostictus, off the Pacific coast of Japan, consisting of spatial
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A population dynamics model for Japanese sardine,
Sardinops melanostictus, off the Pacific coast of Japan,
consisting of spatial early-life stage
and age-structured adult sub-models
Maki Suda, Tatsuro Akamine and Hiroshi Nishida
National Research Institute of Fisheries Science, Fisheries Research Agency
Concepts of model
A group of fish
FISH object
Contents
1 Stock fluctuation of Japanese sardine
2 Life cycle model for Japanese sardine
3 Example of the simulation
Japanese sardine
0
2000
4000
6000
1905 1935 1965 1995
Year
Japanese sardine catch
Cat
ch (x
100
0 to
ns)
In the late 1980s, successive recruitment failures occurred.
vary according to the level of stock abundance (high and low )
Japanese sardine
0
50
100
150
200
250
0 1 2 3 4 5
Age
Stan
dard
leng
th (m
m)
020406080100120140
Indi
vidu
al w
eigh
t (g)
Standard length (mm)Individual weight (g)
0
0.2
0.4
0.6
0.8
1
1.2
0 1 2 3 4 5
Age
Mat
urat
ion
rate
vary according to the level of stock abundance (high and low )