Friday , April 16 2021

David Suzuki: Human behavior is at the root of the rage

The news about Mother Tahlequah, who carried her dead honeymoon for 17 days through Salish Sea this summer, was heart and rightfully captured the attention of the world. He stressed the plight of one of the marine mammals threatened with the disappearance of Canada. The population of murderous whales (orca) in the southern part has fallen by 25% in two decades. Only 74 remain and nobody has been born successfully within three years.

The survival of the South's inhabitants depends on chinook salmon, their main food. On the Fraser River, one of the most important C.C. salmon rivers, 11 of the 15 chinook stocks are extremely exhausted and require conservation action. Habitat destruction, fishing, pollutants, farming, water heating and acidification by climate change, as well as threats from open salmon cleanliness hold a role in the fall of chinook. Commercial and recreational fishing competes with whales for salmon, and their presence, along with all ocean movement, disrupts food whales.

Athletic fishing groups attribute chinook reduced to seals and sea lions and call for slaughter. But blaming the seals does not explain the low chinook returns.

People almost excluded port seals from the coasts of Northern Ireland. in the 20th century. The control of the princess and the excessive intrusion of the trade of fur trade brought populations to less than 10,000 in the 1960s. Since the seals were protected in 1970, the numbers grew almost to the pre-exploitation levels of 1880, to about 110,000, and remained stable since the late 1990s. Restoration of seal populations can be considered a good story.

It is tempting to look for simple linear solutions, such as a slaughter, but it is very unlikely that you have the desired result. The complexity of marine food tissues requires a non-linear view that includes millions of ecological possibilities. According to a study, only 4% of the port diet is salmon, and even less is chinook. The seals eat all kinds of young salmon and only rarely the adult salmon targeting recreational fishing. They also eat small fish such as hake, which are big chocolate-salmon raptors, and fish that compete with the chinook. It is likely that the presence of the stamp increases despite decreasing chinook numbers.

Transient orchestras were more frequently observed by their foreign cousins ​​in the coastal waters of the UK. over the past decade. Their population is estimated to have grown to about 300. These orcas prefer to eat seals at the harbor, requiring the caloric energy of about one seal per day.

Many people who ask for sea lion seals and plumes also point to increased hatchery production as the best solution for dropping wild salmon stocks. However, over more than 130 years of West Coast hatcheries, fishing has collapsed and wild salmon populations have fallen. The proliferation of hatcheries between 1900 and 2014, among other factors, led to a 97% reduction in Puget Sound.

Pacific salmon is an adaptive species able to measure genetic variations within 17 generations and capable of adapting to the changing natural environments where they were born. Artificial choice of parents in a hatcher removes much of the natural selection needed to ensure effective adaptation. The most recent science also shows that short periods of time in an artificial environment change the hatchery's fish, making them less suitable for survival and transferring genes that can damage wildlife if farmed fish do so in the area reproduction.

Fishponds can never be really wild. Their presence can cause more damage than good. Surviving people compete with wild fish for eating and in some cases they can eat smaller wild fish. With more than five billion salmon hatchery released each year, concerns are expressed about the total capacity of the North Pacific Ocean and the limited supply of food. Often the use of hatcheries leads to an increase in fishing capacity to justify the costs of the hatchery or to avoid the necessary actions such as reducing catches and restoring habitats for the reconstitution of wild fish populations.

Environment and Sustainable Development Commissioner Julie Gelfand called on the federal government to protect endangered, calm, limited and delayed. People are the main threat to wildlife. We have to take responsibility and change our devastating ways. If we want to survive orcas and other species, we should look in the mirror and change our own behavior.

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