5/27/09

A Letter from Alexandra Morton




I have been in Norway for 10 days because 92% of fish farming in British Columbia is Norwegian owned. I have met with many Norwegian scientists, members of the Mainstream and Marine Harvest boards, been to their AGMs, toured the area with fishermen, examined a closed-containment facility, met the Norwegians fighting for their fish and joined a scientific cruise.

I thought Norway had this industry handled and I expected to learn how marine salmon farming could work, but this has not been the case. My eyes have really been opened. This industry still has major issues that are growing and has no business expanding throughout the temperate coastlines of the world. The way they have been treating sea lice in Norway has caused high drug resistance. The only solution in sight is increasingly toxic chemicals. In the past two years (2007, 8) sea lice levels have actually increased on both the farm and wild fish. The scientists I met with are holding their breath to see if drug-resistant sea lice populations will explode and attack the last wild salmon and sea trout. The same treatment methods have been used in BC and we can expect this to occur as well.

I am not hearing how the industry can possibly safeguard British Columbia from contamination with their ISA virus. Infectious Salmon Anemia is a salmon virus that is spreading worldwide, wherever there are salmon farms. In Chile, the Norwegian strain of ISA has destroyed 60% of the industry, 17,000 jobs and unmeasured environmental damage. The industry is pushing into new territory. If this gets to BC no one can predict what it will do to the Pacific salmon and steelhead, it will be unleashed into new habitat and we know this is a very serious threat to life.

Professor Are Nylund head of the Fish Diseases Group at the University of Bergen, Norway, reports that, “based on 20 years of experience, I can guarantee that if British Columbia continues to import salmon eggs from the eastern Atlantic infectious salmon diseases, such as ISA, will arrive in Western Canada. Here in Hardangerfjord we have sacrificed our wild salmon stocks in exchange for farm salmon. With all your 5 species of wild salmon, BC is the last place you should have salmon farms.”

New diseases and parasites are being identified. The most serious is a sea lice parasite that attacks the salmon immune system. There is concern that this new parasite is responsible for accelerating wild salmon declines. The Norwegian scientists agree with many of us in BC. If you want wild salmon you must reduce the number of farm salmon. There are three options.

The future for salmon farming will have to include:

permanently reduction of not just the number of sea lice, but also the number of farm salmon per fjord,
removing farm salmon for periods of time to delouse the fjords and not restocking until after the out-migration of the wild salmon and sea trout.
But where wild salmon are considered essential they say the only certain measure is to remove the farms completely.


There are many people here like me. I met a man who has devoted his life to the science of restoring the Voss River, where the largest Atlantic salmon in the world, a national treasure, have vanished due to sea lice from salmon farms. Interestingly he is using the method I was not allowed to use last spring... Towing the fish past the farms out to sea. Another man is working with scientists and communities to keep the sea trout of the Hardangerfjord alive. There are so many tragic stories familiar to British Columbia.

The corporate fish farmers are unrelenting in their push to expand. With Chile so highly contaminated with the Norwegian strain of ISA all fish farmed coasts including Norway are threatened with expansion. I made the best case I could to Mainstream and Marine Harvest for removing the salmon feedlots from our wild salmon migration routes, but they will not accept that they are harming wild salmon. They say they want to improve, but they don’t say how. Norway has different social policies which include encouraging people to populate the remote areas and so fish farming seemed a good opportunity to these people. BC has the opposite policy, but the line that fish farms are good for small coastal communities has been used in BC anyway. I have not seen any evidence that it has even replaced the jobs it has impacted in wild fisheries and tourism.

It is becoming increasingly clear to protect wild Pacific salmon from the virus ISA the BC border absolutely has to be closed to importation of salmon eggs immediately and salmon farms MUST be removed from the Fraser River migration routes and any other narrow waterways where wild salmon are considered valuable.

Our letter asking government that the Fisheries Act, which is the law in Canada be applied to protect our salmon from fish farms has been signed by 14,000 people to date at www.adopt-a-fry.org has still not been answered.

Please forward this letter and encourage more people to sign our letter to government as it is building a community of concerned people word wide and we will prevail as there is really no rock for this industry to hide under and longer.


Alexandra Morton

5/15/09

catch and release


http://www.npr.org/templates/story/story.php?storyId=99458498

There are nothing new about "catch and release", neither does the artificial selection in our agriculture or poultry industry. You want something to grow big, grow fast and produce more eggs? No problem! Combine Darwin's natural selection and Mendelian breeding principle and other modern genetic theories from Dr. Fisher, Dr. Falconer, Dr. Williams etc. The modern genetic and breeding programs in our animal science can do pretty much everything for you. Whiting Farm (dryfly hackles)is the first one put this exercise into our sport - flyfishing.

So how about catch and release? What it to do with the artificial selection? Well... as a hunter, a predator, we are doing the selection when we hunt and fish. The number and the quality of the prey we kill will influence the population dynamic, or the evolution of the population. (Sorry, I will try not to use too many jargons.) This is a simple idea. If we only eliminate the big animal as a trophy hunter does. The individual carries those "big genes" will be eliminate from the population, will be less contribute to the future generation. This will give the little guys advantage to breeding more and ultimately change the size of that population, or that species. This idea seems simple but it is hard to document in the nature. because there is not a single gene to determine the size. Usually, "size" of those morphological characters such as human height, weight... are determined by several genes. or several group of genes. We called it quantitative trait (QTL). Also the environmental factors such as nutritions, habitat quality etc will also influence the morphology of the animals. Back to "catch and release", there are still debating among the fisherman that if catch and release is a moral issue. well... I will get into that in another post. But now, the catch and release means, we are minimizing the artificial selection, so the population should maintain their balance, their original trajectory direction in evolution... (to be continued) Here is the NPR talk! Great talk! LINK

10/16/08

Steelhead Research


Science paper about negative hatchery breeding impact in hood river steelhead. The power and fine resolution of this research is because they identified every single return individual and their pedigree. A fine research and elegant design, but sad story of the steelhead.
Title: Genetic Effects of Captive Breeding Cause a Rapid, Cumulative Fitness Decline in the Wild by Hitoshi Araki,* Becky Cooper, Michael S. Blouin Science 5 October 2007: Vol. 318. no. 5847, pp. 100 - 103

Captive breeding is used to supplement populations of many species that are declining in the wild. The suitability of and long-term species survival from such programs remain largely untested, however. We measured lifetime reproductive success of the first two generations of steelhead trout that were reared in captivity and bred in the wild after they were released. By reconstructing a three-generation pedigree with microsatellite markers, we show that genetic effects of domestication reduce subsequent reproductive capabilities by ~40% per captive-reared generation when fish are moved to natural environments. These results suggest that even a few generations of domestication may have negative effects on natural reproduction in the wild and that the repeated use of captive-reared parents to supplement wild populations should be carefully reconsidered.

10/10/08

Why Artificial Breeding Is not Good...

A recent report in Atlantic salmon.
Mate choice play a role in genetic diversity and parasite resistance.


Title: MHC-mediated mate choice increases parasite resistance in salmon
Proceedings of the Royal Society B. Volume 275, Number 1641 / June 22, 2008
Natural (parasite-driven) and sexual selection are thought to maintain high polymorphism in the genes of the major histocompatibility complex (MHC), but support for a link between mate choice, MHC variation and increased parasite resistance is circumstantial. We compared MHC diversity and Anisakis loads among anadromous Atlantic salmon (Salmo salar L.) returning to four rivers to spawn, which had originated from natural spawning (parents allowed to mate freely) or artificial crosses (parents deprived from the potential benefits of mate choice). We found that the offspring of artificially bred salmon had higher parasite loads and were almost four times more likely to be infected than free-mating salmon, despite having similar levels of MHC diversity. Moreover, the offspring of wild salmon were more MHC dissimilar than the offspring of artificially crossed salmon, and uninfected fish were more dissimilar for MHC than infected fish. Thus, our results suggest a link between disassortative mating and offspring benefits and indicate that MHC-mediated mate choice and natural (parasite-driven) selection act in combination to maintain MHC diversity, and hence fitness. Therefore, artificial breeding programmes that negate the potential genetic benefits of mate choice may result in inherently inferior offspring, regardless of population size, rearing conditions or genetic diversity.

10/4/08

be salmon

9/14/08

Masu Salmon in Hokkaido

Snake river Cutthroat Trout

It's a self-explaning species...as you can tell the red-orange marking on the throat... the cutthroat trout. What a beautiful trout species... not only the brillient red marking stikes me, but also the redish - translucent fin are extremely attractive. To my knowledge no one has study the read marking to the cutthoat trout, what is the function? what is the pigment? I have no clue. Maybe I should plan a long vacation in the smoky mountain region and observe this species more closely : )