|
There was some logic on the program. A UK fish expert talked about how 900 years ago fish levels in UK seas were massive, but over the centuries they fell by 150 years ago they had fallen by 90%. In the last 100 years it's fallen further. So you have to take this into account when quoting changing numbers, whether it's a decline or fall today the baseline is much lower than 900 years ago. ie if we get a 2% increase in a species, that's really only a 0.2% increase proportionately to historical levels ie a long long way from bringing it back to upto historical levels.
* there is also the possibility that the numbers rise and fall in long term cycles and there is no long testable number.
I already know that 800 years ago it was against the law to give your workers salmon more than once a week cos the rivers were so full of it was perceived as a low class food, but for the last few hundred years river salmon is a rare expensive food. So this is something that I can believe, but is unreported : A vast change in ecology in some extent due to man quite probably, which happened before manmade CO2..
However it needs further corroberation. I would guess real statistics are difficult to come by. The evidence he gave was largely of the anecdotal type i.e. large fish sizes were more frequent or species which are now difficult to find were frequently landed . Why have no other people been shouting ? and why scientists 200 or 100 years ago didn't mention it. He mentioned rampant overfishing as well as river damming beginning 900 years ago. I say : Also there are other influences, river pollution the cooling water after the medieval warm period, other natural cycles increase in predators etc. What about other parts of the world ? In unfished areas have numbers inreased or declined ? difficult to measure I suppose. Would it be possible to find a place where fish numbers have risen over the last 900 years ?
I would expect the fish in the sea to outweigh UK humans, so surely it would have an ecological impact. If ths story checks out, then it's a real change rather the possible change of Climate Catastrophe and something we could fix, by breeding fish and putting them in the sea. He did once say fish numbers were down by 90-98% this kind of number seems unreal it would mean the sea has become a dessert. When people come out with those kind of numbers they are less credible and sound alarmist.
Whem I looked for corroberation I found all roads led back to York University where the above study was. The only other guy to talk about reducing fish numbers in Europe was a guy tracing it back to the medieval Church increasing the number of fast days so there were more days when people had to look for a substitute to meat. But surely people living by the sea ate fish every day.
- 1 - If you are concerned you can buy fish labelled with the Marine Stewardship Council label
- 2 - fishing is the ultimate - Tragedy of the Commons. Where you shouldn't overgraze cos it will damage the common, but if everyone else does they'll make the money, so evryone overgrazes. Same for traffic jams
- 3 - Other prog - No Fish Zones really helps at all levels . It pushes the price of fish up. So fishermen get richer. Claims works for all from village type to industrial fishing. Could spread idea like Gramean bank.
Scientific American has a great article. -
Hey couldn't you auction 50 year fishing rights for a zone ? in the same way you auction TV or cellphone airwaves to Big Companies
the normal problem being that there is no motivation for me not to fish today cos I won't be picking up the fish in 30 years time, but don't those banker guys buy long term futures. You could arrive to poach and find that area of the sea is policed by Goldman Sachs gunboats.
|