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Oceans' Vocabulary

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Oceans' Vocabulary Unit 4 GROUND FISH ... made of a long wall of netting that is drawn into the shape of a bag to enclose the catch Usually involves two boats BYCATCH ... – PowerPoint PPT presentation

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Title: Oceans' Vocabulary


1
Oceans' Vocabulary
  • Unit 4

2
GROUND FISH
  • fish that live on, in, or near the bottom of the
    body of water they inhabit.
  • Examples cod, haddock, red fish, flounder

3
PELAGIC
  • fish that live near the surface or in the water
    column of coastal or ocean waters (but not on
    the bottom)
  • Examples- herring, bluefin tuna, anchovies

4
RECRUITMENT


  • Means the fish grow to a certain size or
    reproductive rate
  • Refers to age a fish can be caught and counted in
    net

5
YEAR-CLASS
  • consist of all fish born in the same year.

6
FECUNDITY
  • The number of eggs which is laid during one
    spawning period

7
Methods of Fishing

  • http//www.montereybayaquarium.org/cr/cr_seafoodwa
    tch/sfw_gear.aspx

8
OTTER TRAWLER
  • Trawling is a method of fishing that involves
    actively dragging or pulling a trawl through the
    water behind one or more trawlers
  • Otter trawlers deploy one or more parallel trawls
    kept apart horizontally using otter boards. These
    trawls can be towed in midwater or along the
    bottom.

9
Otter trawler
10
LONGLINING
  • longliners set a single line of hooks, up to 130
    km long, behind the boat. Attached to it are
    literally thousands of baited hooks

11
GILLNET
  • A fishing net set vertically in the water so that
    fish swimming into it are entangled by the gills
    in its mesh

12
PURSE SEINE
  • A fishing seine is a net made of a long wall of
    netting that is drawn into the shape of a bag to
    enclose the catch
  • Usually involves two boats

13
BYCATCH
  • fish caught unintentionally in a fishery while
    intending to catch other fish.

14
TARGET CATCH
  • The species which the fishermen intentionally or
    are licensed to catch and keep

15
STOCK
  • Fish stocks are the population of a particular
    species of fish, for which growth, recruitment,
    mortality and fishing mortality are the only
    significant factors in determining the
    population.

16
MAXIMUM SUSTAINABLE YEILD
  • MSY
  • the largest yield (or catch) that can be taken
    from a species' stock over an indefinite period
  • to maintain the population size at the point of
    maximum growth rate by harvesting the individuals
    that would normally be added to the population
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