By Alexandra Mehl, Local Journalism Initiative Reporter HA-SHILTH-SA
Offshore of Vancouver Island, in Nuu-chah-nulth waters north of Tofino, some 65 kilometers west of Hesquiat Harbour, lives a nursery of deep-sea octopuses brooding their eggs.
It is one of just four known octopus nurseries in the world, said DFO researcher Cherisse Du Preez.
In late May, Du Preez and her colleague Heidi Gartner set out to sea on a deep-sea expedition, in partnership with the Nuu-chah-nulth Tribal Council, Council of Haida Nation, Quatsino and Pacheedaht First Nation, Ocean Networks Canada and Fisheries and Oceans Canada.
The expedition was largely to explore the pending Marine Protected Area Tang.散wan-岣膷x史iqak-Tsig瘫is, alongside additional places of protection interest, said Du Preez.
Months prior, the German scientific research organization GEOMAR and Natural Resources Canada discovered bubbles traveling 1.5 kilometers through the water column, indicating a methane seep from the seafloor, shared Du Preez. This was the reason they went to the site.
The group explored roughly 12 locations where gases escape from fissures in the ocean floor. They are among at least 1,500 offshore cold seeps west of Vancouver Island, extending from southern Vancouver Island to Haida Gwaii, said Du Preez.
On their last dive of the expedition, along Hesquiat slope, they came across deep sea octopus brooding on their eggs within cave-like features in carbonate rock created by the cold seeps.
B次元官网网址淭he methane bubblesB次元官网网址hat are bubbling out of the seafloor creates large chunks of methane ice,B次元官网网址� said Du Preez. B次元官网网址淭hey actually create entire uplifts, and they tear the seafloor upwards.B次元官网网址�
She added that this process also B次元官网网址渃reates carbonate rocks that are then habitat on the seafloor that otherwise werenB次元官网网址檛 there.B次元官网网址�
B次元官网网址淚tB次元官网网址檚 almost volcano-like,B次元官网网址� said Du Preez. B次元官网网址淚tB次元官网网址檚 bringing stuff up from deep within the earth, itB次元官网网址檚 creating rocks, and itB次元官网网址檚 all overflowing and then tumbling down and it builds up on itself.B次元官网网址�
B次元官网网址淚n this particular location we saw one of these blisters in the earthB次元官网网址檚 surface,B次元官网网址� she continued. B次元官网网址淲e saw this violent bubbling coming out, and all the rocks that were being created and tumbling down the slope collected in this boulder field that was otherwise surrounded by desert-like, muddy abyss.B次元官网网址�
According to a 2014 study, this particular deep-sea octopus, Graneledone boreopacifica, is known to have the longest-known egg brooding period of any animal due to the cold temperatures of the deep sea waters. The embryonic development period slows down, compared to shallow water octopus which brood their eggs from one to three months.
B次元官网网址淚tB次元官网网址檚 a beautiful deep-sea octopus, very charismatic, purple, big black eyes,B次元官网网址� said Du Preez. B次元官网网址淭hey sit on their eggs, donB次元官网网址檛 move, donB次元官网网址檛 eat and just defend the eggs for a minimum of four and a half years.B次元官网网址�
Like salmon, brooding these eggs will be the last thing that these octopuses do, shared Du Preez.
Cold seeps are recognized by the Canadian government to be among ecologically and biologically significant areas.
B次元官网网址淭hey are so standalone outstanding, with the biodiversity you find around them, that they warrant protection,B次元官网网址� said Du Preez.
The nursery ground that Du Preez and her team discovered is currently located in an area that is fishable.
B次元官网网址淭he most concerning thing about finding a nursery somewhere where fishing can happen, is that it can be that easy to take out a single generation of an octopus,B次元官网网址� she said reflecting on bottom contact fishing.
The crew counted 25 easily-spotted octopuses, though Du Preez said she has B次元官网网址渘o doubt that there were hundreds more than what we saw.B次元官网网址�
Gartner, also a DFO researcher, said that as they moved along the seafloor in more sandy locations they also saw young octopus close to the nursery.
B次元官网网址淚t was really good evidence for us that this nursery habitat is really effective,B次元官网网址� said Gartner.
Deep-sea octopuses represent the top of the food chain, making them significant to the distribution of energy in the deep sea, said Du Preez.
B次元官网网址淲hen the top predators arenB次元官网网址檛 healthy, they actually have an effect back on the ecosystem,B次元官网网址� she said.
Du Preez explained that octopus living along Hesquiat slope will have an impact on global ocean ecosystems.
B次元官网网址淚f you didnB次元官网网址檛 have that nursery groundB次元官网网址ou almost couldnB次元官网网址檛 imagine the ripple effect, if that wasnB次元官网网址檛 a safe place for the octopus,B次元官网网址� said Du Preez. B次元官网网址淵ou might not have that type of octopus anywhere along the North American continental slope B次元官网网址� all five coasts B次元官网网址� because they all come from that one nursery ground.B次元官网网址�
Dianne Ignace and her family lives in the small village of Heskwii in Hesquiat Harbour. For the family, octopuses close to the shore are a common sighting.
B次元官网网址淲e do have some excitement with octopus every now and then,B次元官网网址� said Ignace.
Ignace has been told stories from her husband and his father, George Ignace, about at the rocky drop off at the edge to the channel where octopuses could reside, said Ignace.
B次元官网网址淟ong ago the old-timers used to go down there and dig them out,B次元官网网址� said Ignace. B次元官网网址淭hey get right in the water, and nobody does it anymore.B次元官网网址�
They would eat them, she said.
Oftentimes when Ignace or her family have come across an octopus, it happens in the winter. When they do find them on shore itB次元官网网址檚 after they have been dropped by an eagle.
B次元官网网址淓agles fly over here with it, and they just lose their grip or somehow the thing wiggles free,B次元官网网址� she said. B次元官网网址淚t drops on the flat, and a lot of times when that happens, the eagles dive down and they start eating it on the beach.B次元官网网址�
B次元官网网址淓agles really like to eat octopus because weB次元官网网址檝e seen a lot of them eating them,B次元官网网址� she added.
Ignace said that once they saw a sea otter laying on its back eating an octopus.
B次元官网网址淚t fell off a few times too and then the sea otter would dive under and find it again, pick it up again,B次元官网网址� she said. B次元官网网址淚t was really interesting to watch.B次元官网网址�
For Gartner, a collective love and connection to octopus can help connect people to the importance of deep-sea conservation.
B次元官网网址淪eeing an animal thatB次元官网网址檚 intelligent and with big eyes and living so deep, so remote, so far away from us, and yet, thereB次元官网网址檚 so many elements that you can connect to itB次元官网网址檚 just kind of special,B次元官网网址� said Gartner. B次元官网网址淚tB次元官网网址檚 a great way to connect the deep sea to us.B次元官网网址�
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