2. INTRODUCTION :
•Overfishing is catching too many fish at once, so
the breeding population becomes too depleted to
recover.
•Overfishing often goes hand in hand with
wasteful types of commercial fishing that haul in
massive amounts of unwanted fish or other
animals, which are then discarded.
Causesof Overfishing
Poor Fisheries Management.
Unsustainable Fishing.
Illegal and Unregulated Fishing Activities.
Economic Development and Food Needs.
Open Access Fisheries.
Marine Ecosystem Imbalance.
Dwindling Harvests of Targeted Fish.
3. METHODS USED IN OVER FISHING
1. Longline fishing 2. Driftnet fishing 3. Trawl fishing
4. Gillnet fishing 5. Seine net fishing 6. Dynamite fishing
A longline is a single, very long
fishing line that is dragged behind a
boat,has a baited hook that’s used to
lure and catch the target fish.
a free-floating net that’s either deployed
in an ocean current or rigged with
weights on one side that keep it on the
seafloor.
Trawlers drag nets across the
bottom of the seafloor to catch
the marine life that lives on or
near it. Commonly targeted
species include shrimp, cod,
rockfish, and flounder.
drift net made from a mesh of
monofilament line. When a fish is
caught, it is trapped by the gills which
means it can’t swim forward or
backward to escape.
a purse-seine net like a lady’s
drawstring purse where the pouch
is filled up and the top is cinched
shut.
A destructive fishing method
using explosives to kill and collect
fish. Often used around coral
reefs, causing habitat destruction.
4. IMPACTS OF OVER FISHING ON AQUATIC LIFE
80% of world’s fish stocks are already fully exploited.
3,00,000 of whales and dolphins are killed each year via by-catch.
90% of predatory fish : Tuna, Sharks, Swordfish, COD & Halibut are
almost extinct.
1/5 of fish are caught illegally ranking in an estimated $50b a year.
World fisheries expected to collapse by 2050.
Increased depletion of coral reef and bottom water eco-system.
REMEDIES of over fishing on aquatic life
Avoid overfishing.
Consider climate.
Improve traceability.
Limit bycatch.
Limit wild fish use as feed
Manage pollution & disease.
Preserve habitats.
Prevent farmed fish escapes.
