After 100 years of absence, large numbers of Pacific white-sided dolphins are back in the northern part of British ColumbiaB次元官网网址檚 Salish Sea.
But while their return is being greeted by some with delight, the head of a commercial fisheries group is dismayed by the appearance of what he calls an B次元官网网址渋nvasive species,B次元官网网址� alongside increasing numbers of seals and sea lions.
Simone Thom, a BC Ferries catering worker, said she was thrilled to see a superpod of hundreds of Pacific white-sided dolphins, frolicking in the wake of a ferry from Comox to Powell River last month.
ThomB次元官网网址檚 video of the B次元官网网址渆xhilaratingB次元官网网址� encounter went viral on social media.
B次元官网网址淚t (was) truly magical to see them in their natural state doing their ballet,B次元官网网址� said Thom. B次元官网网址淚B次元官网网址檝e lived here on the island pretty much my whole life and IB次元官网网址檝e never seen this.B次元官网网址�
So many dolphins in that particular area is rare, said Professor Andrew Trites, director of the Marine Mammal Research Unit at the University of British Columbia.
Although there are estimated to be one million Pacific white-sided dolphins, they are usually found in the open ocean.
Small numbers began to visit the Georgia Strait in the early 2000s, with about 100 to 200 eventually taking up residence in the Salish Sea, Trites said.
B次元官网网址淲e know they were here in the past,B次元官网网址� Trites said.
Their remains have been found in First Nations middens going back 2,000 years, but they all but disappeared for 100 years, he added.
B次元官网网址淪o thatB次元官网网址檚 a strange thing, like where did they go and what brought them back?B次元官网网址�
Their return coincides with an increase in the number of seals, sea lions and transient killer whales that prey upon marine mammals.
Trites said one possible explanation was that through complex food web interactions, the increase in the number of seals may lead to more young herring for dolphins to feed on.
B次元官网网址淏efore this time, we had heavy culling of seals. There was whaling. WeB次元官网网址檝e come through a period of removing marine mammals and trying to control nature. And now, since theyB次元官网网址檝e been protected, I think the ecosystem is re-establishing itself and re-establishing a natural balance which is healthier overall.B次元官网网址�
Others vehemently disagree.
B次元官网网址淭hese dolphins are here because the balance in the waters is off,B次元官网网址� said Tom Sewid, a commercial fisherman from KwakwakaB次元官网网址檞akw First Nation. He said the dolphins are B次元官网网址渁n invasive speciesB次元官网网址� driven into new waters by driftnet fleets.
As for the increasing number of seals and sea lions over the past 50 years, Sewid said it was another example of how the ocean is out of balance.
B次元官网网址淲eB次元官网网址檝e forgotten our Indigenous ways of harvesting seals and sea lions, and in those areas, weB次元官网网址檙e seeing a great overpopulation,B次元官网网址� he said, adding that he believed overpopulation of seals and sea lions was a major contributor to the depletion of salmon stocks.
Sewid is the president of Pacific Balance Marine Management, an organization seeking to protect salmon and other fin fish stocks from being B次元官网网址渆aten into extinction,B次元官网网址� by redeveloping a First Nations-led commercial seal and sea lion harvest.
He said a series of fisheries ministers had B次元官网网址渂asically ignoredB次元官网网址� their requests.
Sewid said he addressed federal Fisheries Minister Joyce Murray at last monthB次元官网网址檚 first-ever Seal Summit, a two-day conference for stakeholders in the seal industry.
B次元官网网址淚 said, B次元官网网址楥ome hell or high water, coastal First Nations and river First Nations of British Columbia, we will get a licence to sell our seal and sea lion products,B次元官网网址橞次元官网网址� he said. He said he would take the issue to the courts if necessary.
B.C. First Nations are currently allowed to harvest seals and sea lions for food, social and ceremonial purposes. Sewid says permitting the sale of fur, omega-3 supplements, meat and other products would create 4,000 jobs and allow fin fish populations to recover.
In the past three years, Pacific Balance Marine Management has provided gift cards to First Nations harvesters to purchase bullets.
Sewid estimated that thousands of seals have been removed for food, social and ceremonial purposes from rivers, lakes and estuaries. He said salmon numbers were increasing in some systems as a result.
Stomach samples were being taken for research purposes, and meat and blubber testing for toxins.
Sewid said he would submit a harvest proposal to Murray, and wants a quota set for seals and seal lions.
He estimates an annual harvest of 5,000 to 10,000 seals would be sustainable. According to Fisheries an Oceans research documents, there are approximately 40,000 sea lions and 105,000 seals in all of B.C.
Carl Walters, professor emeritus at the University of British ColumbiaB次元官网网址檚 Institute for the Oceans and Fisheries, sees the potential for a substantial First Nations-led seal and sea lion harvest based on historical data and modelling predictions. He presented his findings in early December to the Senate committee on fisheries and oceans.
B次元官网网址淚tB次元官网网址檚 wrong to think things are coming into balance. OK, even if they are, why do we have to accept that kind of balance? Why do we have to accept a balance that has a top-heavy food web with a really large number of ugly, nasty blubberballs hauled out on the rocks?B次元官网网址� he asked.
He said a 50 per cent reduction of the seal and sea lion population over two to three years would yield the maximum sustainable yield of seals and sea lions, while rebuilding the Georgia Strait salmon fishery to about half what it was at its peak in the 1980s.
B次元官网网址淚f it was up to me, weB次元官网网址檇 knock them down to about 20 per cent of their current level. WeB次元官网网址檇 accept a lower harvest for that population, because the benefits to the fishery would be so much larger.B次元官网网址�
He said thereB次元官网网址檚 no doubt that seals and sea lions are consuming salmon, but itB次元官网网址檚 not clear if they are actually eating B次元官网网址渄ead fish swimmingB次元官网网址� B次元官网网址� older or diseased fish that were about to die anyway.
The only way to know for sure, he said, would be to conduct a large-scale experiment to reduce the population by half, and assess the impact on salmon stocks over 10 years.
He said he was B次元官网网址渃ompletely confident that there will not be a big food web effect.B次元官网网址�
B次元官网网址淲e had a 60-year period from 1920 to 1980 where seal populations were low in the Georgia Strait,B次元官网网址� he said. B次元官网网址淲e had a huge long experiment if you like, and nothing went wrong in the ecosystem B次元官网网址� In a way, weB次元官网网址檇 be returning the system to the state that showed really high productivity. ItB次元官网网址檚 a no-brainer.B次元官网网址�
But Trites warned that such an experiment would be a B次元官网网址渉uge gamble.B次元官网网址�
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B次元官网网址淭he risk of running such an experiment is that youB次元官网网址檙e playing with life.B次元官网网址�
Trites said seal and sea lions numbers had been stable for 25 years, something inconsistent with overpopulation or a population out of balance. Present numbers were similar to what they were in the 1880s, when Europeans first arrived, he said.
B次元官网网址淚 donB次元官网网址檛 see any evidence that if the seals are removed, youB次元官网网址檙e going to see more salmon,B次元官网网址� he said.
Researchers had found that juvenile salmon were dying in the open ocean at higher rates.
B次元官网网址淭he seals are not in the open ocean,B次元官网网址� Trites said. B次元官网网址淪omething else is out there.B次元官网网址�
He said there was B次元官网网址済enerational difference in valuesB次元官网网址� regarding attitudes toward seal and sea lions.
B次元官网网址淭hose that grew up in the B次元官网网址�50s and B次元官网网址�60s saw a world where man dominated and we removed the marine mammals and that was just fine,B次元官网网址� he said.
B次元官网网址淲hat I see with the current generation of young scientists is theyB次元官网网址檙e concerned about conservation. TheyB次元官网网址檙e concerned about keeping ecosystems healthy, and itB次元官网网址檚 not about resource extraction B次元官网网址� In the end, itB次元官网网址檚 just a difference of values.B次元官网网址�
In a written response to questions, the Fisheries Department said it worked with First Nations on plans to harvest small amounts of seals and sea lions for food, social and ceremonial purposes.
It confirmed it had received a few proposals for a commercial seal and sea lion harvest. A review is typically a multi-year process taking into account ecosystems, biodiversity and harvest methods, it said.
B次元官网网址淐ommercial fisheries are not to be used as a tool to control populations,B次元官网网址� the department said. B次元官网网址淭here is a high degree of scientific uncertainty regarding the extent of pinniped [seal and sea lion] predation on wild fish stocks.B次元官网网址�
Liana Hwang is a family physician in Alberta with a science degree from the University of British Columbia, and a fellow in Global Journalism at the University of Toronto.
B次元官网网址� LIANA HWANG, THE CANADIAN PRESS
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