The World's Forgotten Fishes - 23
© Hkun Lat / WWF-Myanmar
Fish market in
Kachin state,
Myanmar
DOES RESTOCKING WITH
HATCHERY FISH HELP OR HARM
DECLINING WILD FISHERIES
When wild freshwater fisheries
decline, fisheries managers often
aim to enhance populations through
the stocking of hatchery-reared fish.
Stocking is a widely used fisheries
management tool within freshwater
ecosystems, especially in Asia and
Africa. While no global evaluations
have been conducted on whether
stocking has increased or maintained
any fisheries, there is scientific evidence
that releasing live fishes into the wild
can have significant negative impacts
on wild fish populations by reducing the
genetic health of wild fishes that breed
with hatchery-produced fish. Stocking
also risks ecological health as it may
introduce competition, predation and
disease to native fishes, as well as result
in the establishment of invasive nonnative fishes. To overcome the impacts
on wild fish populations, countries
should develop responsible stocking and
hatchery guidelines and policies as well
as review their current programmes to
safeguard against unintentional harm
to freshwater biodiversity.
Threat score
Threat
Score
1
Low threat
2
3
4
5
6
7
8
9
10
High threat
Basin
High 10 Threat
Threat 9 Score
Low threat
1
Score 8
2
7
3
w threat
1
6
4
2
5
5
3
6
4
4
7
3
8
5 2
9
High6threat
10
Low 1
Basin
Basin
River
River
Lake
Lake
7
8
9
Figure
for river
basins that support (indicative) freshwater fisheries. Out of the 87 basins assessed,
Basin scores
River
Lake
10 5. Threat
15 are considered at 'high' threat, and 33 at 'moderate' threat due to pressures from pollution, water use (abstraction),
climate variability, land use, loss of riverine connectivity and population density. Taken from FAO, 202030.
The World's Forgotten Fishes page 23
The World's Forgotten Fishes
Table of Contents for the Digital Edition of The World's Forgotten Fishes
Contents
The World's Forgotten Fishes - 1
The World's Forgotten Fishes - 2
The World's Forgotten Fishes - Contents
The World's Forgotten Fishes - 4
The World's Forgotten Fishes - 5
The World's Forgotten Fishes - 6
The World's Forgotten Fishes - 7
The World's Forgotten Fishes - 8
The World's Forgotten Fishes - 9
The World's Forgotten Fishes - 10
The World's Forgotten Fishes - 11
The World's Forgotten Fishes - 12
The World's Forgotten Fishes - 13
The World's Forgotten Fishes - 14
The World's Forgotten Fishes - 15
The World's Forgotten Fishes - 16
The World's Forgotten Fishes - 17
The World's Forgotten Fishes - 18
The World's Forgotten Fishes - 19
The World's Forgotten Fishes - 20
The World's Forgotten Fishes - 21
The World's Forgotten Fishes - 22
The World's Forgotten Fishes - 23
The World's Forgotten Fishes - 24
The World's Forgotten Fishes - 25
The World's Forgotten Fishes - 26
The World's Forgotten Fishes - 27
The World's Forgotten Fishes - 28
The World's Forgotten Fishes - 29
The World's Forgotten Fishes - 30
The World's Forgotten Fishes - 31
The World's Forgotten Fishes - 32
The World's Forgotten Fishes - 33
The World's Forgotten Fishes - 34
The World's Forgotten Fishes - 35
The World's Forgotten Fishes - 36
The World's Forgotten Fishes - 37
The World's Forgotten Fishes - 38
The World's Forgotten Fishes - 39
The World's Forgotten Fishes - 40
The World's Forgotten Fishes - 41
The World's Forgotten Fishes - 42
The World's Forgotten Fishes - 43
The World's Forgotten Fishes - 44
The World's Forgotten Fishes - 45
The World's Forgotten Fishes - 46
The World's Forgotten Fishes - 47
The World's Forgotten Fishes - 48
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