5.1.1 Fish stocks (world)

5.1.1 Fish stocks (word .doc)(download)

5.1.1 Fish stocks

1. How many categories of world’s fish stocks are there? What are they?

The world’s fish stocks can be grouped into 3 categories.

a)      Fresh water fish stocks,

b)      Brackish water fish stocks,

c)       Marine stocks.

2. State the five low value species of marine stocks

  1. Alaskan Pollack,
  2. Chilean jack mackerel,
  3. Japanese pilchard,
  4. Peruvian anchoveta,
  5. South – American pilchard.

3. Explain the term untapped stocks?

  • Untapped stocks are stocks that are potentially good sources of protein that have not been    tapped.

Reasons: 1. The cost to catch the fish is greater.

2. They do not fetch a high market price.

4. Give examples of pelagic and demersal fish?

Pelagic fish: Anchoveta, Herring, Mackerel and tuna

Demersal fish: Cod, snapper, flounder, etc.

5. Define the difficult words.

1. Demersal: Live near the bottom

2. Exploitation: – Use of resources by organisms

3. Pelagic: – Live in open water

6. How many groups of world’s marine stocks are there? What are they?

The World’s marine fish stocks can be divided into 2 groups.

1. Economically important,

2. Untapped.

7. Write about the “High Seas Resources”.

  • High seas resources exist beyond the 200 miles zones.
  • They are mostly pelagic.
  • Some demersal resources exist on sea mounts.
  • There are about 400 high seas species.

v  50 species of cephalopods,

v  270 species of fish,

v  60 species of marine animals.

Definitions:

Estuary: The area where the river and sea meet is called as estuary.

In estuary the salinity level changes always. During the summer the salinity is high as there is less water deposition from river to sea. During rainy season the salinity in estuary is less because of high dilution in sea this is because high level of fresh water deposit in sea.

Brackish water: the water which has moderate level of salt is called as brackish water. The brackish water availability is high in estuary.

Mari-culture: culturing the fish in deep ocean is called as Mari-culture.

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