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A fishery in Decline? In the ‘60s
was the reduction herring fishery – in the ‘80s the roe fishery --- but it
too has peaked and declined both as jobs and $$ Not
surprisingly fishers and scientists who remain are content with themselves
and see only small changes required to status quo |
“If It ain’t broken, don’t fix it”
Complacency? |
Status quo
position:
Present management system works well – yes some areas have had to be closed
in past – but that requires only some minor tinkering to remedy |
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BUT --- there were some dissenting voices – one long time
shore worker has seen his job shipped out to Vancouver to process roe – 1st
Nations questioned if present system (gillnets) didn’t waste 25%
herring that drop from net Others
questioned the science --- the meta-population model was risky of
small populations --- scientist disputed if ‘discrete populations’ existed
etc |
Cutting edge 1980’s Science??
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Can DNA find differences?
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Here is work from
NS where preliminary info suggests at least 4 distinct (microsatellite
DNA) herring populations – several of which are side by side There is published
work from Prince William Sound in AK (O’Connell 1998) with 3 side by side
populations etc A corollary of meta
population model is a depleted ‘stock’ will be replaced by the meta-population
– but in literature documented same “stock” replaced itself once fishing
pressure removed and neighboring stocks did not usurp the habitat (Georges
Banks) |
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1st nations and Back to Future see
present herring populations as
depressed (75%??) while DFO contends present ‘biomass’ equal to past ---
Traditional Ecological Knowledge vs “facts” |
Ecosystem Based?? – while the words were used the
proposals given were single species management with no consideration of what
role herring play as “forage fish” in ecosystem ( for essay contrasting EBM
and single species MSY see
here |
Of course there is no correct answer – some taxonomist don’t even distinguish Atlantic and
Pacific herring as separate species
Obviously herring can and do spread quickly and widely – but the debate continues – at finer scales can we detect differences?’
And if so will ‘we’ not be the poorer if allow smaller
populations to be destroyed?
Created by LG Wednesday, November 05, 2003