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Fisheries Case Studies

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Commercial catch of Japanese pilchards ... (A) Catch of North Sea Herring and (B) spawning stock biomass of the autumn spawning herring. ... – PowerPoint PPT presentation

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Title: Fisheries Case Studies


1
Fisheries Case Studies
  • Japanese Pilchard (Anchovy)
  • Norwegian Spring-Spawning Herring
  • Canadian Pacific Herring
  • Canadian Atlantic Cod
  • North Sea Cod
  • North Sea Herring

2
Clupeid Gadoid Fisheries
  • r Selected Species
  • 1/3 Global Fisheries
  • Instability ? Management Challenges

3
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4
Anchovies
5
Sardines
6
Herring
7
Commercial catch of Japanese pilchards
8
Geographical distribution of the four
subpopulations of Japanese pilchards and annual
catch by region from 1972 to 1976. Numbers in
circles are catch in thousands of tonnes.
9
Kuroshio Current
10
Survival of young Japanese pilchards from eggs to
post-larvae at an age of ten weeks.
11
Commercial catch of Japanese pilchards
12
Norwegian spring-spawning Herring
13
Migration routes of the Norwegian spring-spawning
herring.
14
Commercial catch, recruitment of 3-year old fish,
and spawning biomass of Norwegian spring spawning
herring.
15
Percentage contribution of year classes of
Norwegian spring spawn herring to the adult stock
from 1954 through 1962. The very good year class
of 1950 began first appearing in significant
numbers in 1954 and dominated the adult stock
throughout this period.
16
Migration routes of the Norwegian
spring-spawning herring during the period
1963-1966.
17
Growth curves of Norewgian spring-spawning
herring during various periods of time.
18
The location of the nine major populations of
British Columbia herring.
19
Drum seining (small) vessels
20
Time series of British Columbia herring catch
21
Cod, Haddock, Pollock
22
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23
Commercial cod landings in the northwestern
Atlantic Ocean
24
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25
Commercial catches of cod in the North
Sea
26
(A) Catch of North Sea Herring and (B) spawning
stock biomass of the autumn spawning herring.
The dashed line in panel B is the target spawning
stock of 1.3 Mt recommended by the ICES.
27
Harvest of sexually immature fish Over Capitlizatn Habitat destruction Recruitmt overfishing Closure of fishery
Japanese Pilchards
Norwegian spring-spawning Herring ? ? ?
Canadian Pacific Herring ? ? ?
Canadian Atlantic Cod ? ? ? ?
N. Sea Cod ? ? ?
N. Sea Herring ? ? ?
28
Species to Avoid
  • Chilean Sea Bass
  • Orange Roughy
  • Atlantic Halibut
  • Bluefin Tuna
  • Shark
  • Atlantic Swordfish

29
Chilean Sea Bass
  • Dissostichus eleginoides
  • Patagonian toothfish
  • Z 150 12,500 feet
  • W 20 lb age 50 yr
  • Sexual maturity 6-10 yr
  • Population doubling time 514 yr
  • Very long w.r.t. many Coml fisheries
  • K-species

30
Orange Roughy
  • Hoplostelhus altanticus
  • Mesopelagic habitat (3-9C, 200-2000 m)
  • Atlantic and Pacific Oceans
  • Age 150 yr
  • Large spawning aggregations
  • 20,000 eggs/clutch fert?hatch 10-20d
  • Sexual maturity at 25-30 yr
  • K-species

31
Atlantic Halibut
  • Hippoglosus hippoglossus
  • Z 50 -2,200 m
  • Among largest boney fish in the world
  • Age 50 yr L 5m W 700 lb
  • Sexual Maturity 7 12 yr ( m f)
  • Endangered-list since 1996
  • K-species
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