Another large
category of harvested fishes, accounting for nearly
10 per cent of the world's fishery harvest, is the
groundfish, or demersal fish, that live near the
ocean floor. These generally white-fleshed fishes
include cod, haddock, pollock and hake. Cod and
haddock tend to be relatively high in commercial
value.
Fish such as tuna, swordfish, marlin, and mahimahi
make up the large pelagic fish category and account
for nearly 5 per cent of world harvest. Tuna is
consumed fresh in great quantities in Japan and sold
canned around the world. Canned tuna is the fish
eaten most often in the United States.
Salmon belong to the anadromous group, meaning they
lay their eggs in freshwater but usually spend their
adult lives in the ocean. Although the salmon
fishery only accounts for about 2 per cent of world
fishery harvests, it is one of the most important
wild fisheries in the United States (especially in
Alaska), Canada, Japan and Russia.
Salmon are also cultured in
farms in many countries including Norway, Chile, Canada,
Scotland, Australia, and the United States. Some species of
salmon are also highly prized sport fish.
Several freshwater fisheries are also important. Carp and
related freshwater fish are consumed mostly in Asia and
parts of Europe. Carp are generally raised in ponds and
account for nearly 10 per cent of all fish harvested
worldwide. In the Southern United States, the farm-raised
catfish industry grew rapidly from a cottage industry in the
1970s to the largest aquaculture industry in the Unites
States in the 1990s.
The tilapia, a freshwater or
brackish water (mixture of fresh and saltwater) fish native
to Africa, is now being raised globally to add protein to
the diets of people in less-developed areas especially in
Asia and South America.
It is also being sold to meet
the growing demand for seafood in countries such as the
United States. Tilapia harvests make up a relatively small
percentage of the global fish supply, but production is
still increasing.
Shrimp are harvested worldwide. Most large and medium-sized
shrimp come from the tropical waters of countries like
Thailand, India, Ecuador, and Mexico. Many small shrimp are
harvested from the cold waters of Iceland, Greenland, and
Canada.
Today, cultured or farmed
marine shrimp play an important role in supplying the
world's shrimp demand. Total wild and farmed shrimp harvest
accounts for less than 5 per cent of the total world
fisheries harvest. Even so, shrimp has a very high
commercial value and is the most important species group in
world fisheries trade.
Fisheries in Pakistan
Fishery plays an important role in the national economy. It
provides employment to about 300,000 fishermen directly. In
addition, another 400,000 people are employed in ancillary
industries. It is also a major source of export earning. In
1998-99, fish and fishery products valued at US $120 million
were exported from Pakistan.
Federal government is
responsible for fishery of exclusive economic zone of
Pakistan. In addition, it is also responsible for making
policies, inter-provincial co-ordination, planning,
research, quality control, training, exploratory fishing,
stock assessment, fisheries management, fleet improvement,
data collection and export etc.
Pakistan is endowed with rich fishery potential. It is
located in the northern part of the Arabian sea and has a
coastline of about 1,120 km with a broad continental shelf
and its exclusive economic zone extends up to 200 nautical
miles from the coast.
There are about 16,000
fishing boats in coastal area of Pakistan which operate in
shallow coastal waters as well as in offshore areas. There
fishing boats undertake fishing trips lasting for few hours
to about 25 days depending upon type of fishing. Total
production from inland and marine waters is approximately
0.60 million tonnes.
Fisheries management
Fisheries are difficult to manage effectively because they
exist in a complex ecosystem and are often considered a
common property resource (owned by all citizens of a
nation).
Aquaculture , or fish farming, in which aquatic organism are
raised under controlled conditions in ponds, tanks, or
floating net pens, is becoming a part of fisheries
management. Aquaculture techniques, which help increase
stock populations and control predators, are used in the
oyster, clam, and mussel fisheries.
Fish farming may help reduce
harvest pressure on the remaining wild stock. In Japan, the
chum salmon fishery and several other fisheries depend upon
hatcheries where fish reproduction and survival is enhanced
to provide the young fish. In fact, aquaculture production
is becoming an essential part of the world's fish supply.
They share of the total world
harvest produced through aquaculture has steadily increased
over the past two decades and now accounts for nearly 20 per
cent of world harvest.
One of the greatest challenges in fisheries management is
the control of bycatch, the unintentional killing of species
not intended to be caught, such as low value fish, immature
fish, or even marine mammals. Fisheries are influenced by
more than just fishing activity.
Fishery managers must also
manage activities on land, such as agriculture, irrigation,
pollution and development, that may impact critical
fisheries habitat. Finally, fisheries exist in an
environment that naturally fluctuates.
Events such as changes in
ocean currents and temperatures can dramatically influence
the size and health of fish stocks, making them more of a
challenge to mange effectively.
It is becoming increasingly
clear that the effective fisheries management, at both the
policy making and the implementation stages, depends
critically on agreement and participation that utilise
objective and reliable reporting of fishery status and
trends.
Courtesy: The News