There is something fishy going on in Derbyshire – but it’s the good kind of fishy.

After two centuries and 80 kilometers inland, an amazing thing has happened on one of the largest rivers in Britain – a salmon was seen leaping its way upstream to spawn.

This amazing thing – which is more common in Scotland and Canada – was seen in Derbyshire on the Rover Derwent.

The salmon – which would have swum to the ends of the earth just to spawn and perish – had an easier time making its way up the river due to the higher water levels because of recent rainfall.

Experts are keeping their fingers crossed, and by building “fish passes” around the weirs, hope to encourage a more permanent presence of the salmon.

Salmon need to be able to make their way upstream to breed, and Jim Finnegan – an Environment Agency expert – has commented that everything should be done to try and make this process easier.

He said: ‘We have been down there and seen salmon trying to leap over the weir.
‘But the ultimate objective is to see them spawning or breeding in the Derwent, and there’s no evidence of that yet.
‘We will need to build these fish passes.’

Well, the good news is that the salmon are making their way back up to Derwent. This means, that with a little bit of work and care, that we as humans can help mother nature return to its natural course.

Salmon fry

There has been a lot of buzz surrounding the speculation, which was tossed around this week, that a volcanic eruption on an Alaskan island back in 2008 is somehow responsible for the boom in the salmon population this year in the rivers of British Columbia in Canada.

If this speculation proves to be correct, it will help biologist’s to shed some new light on the rather unpredictable sizes of the populations of salmon year in and year out. It will also lend credence to the controversial idea of seeding the oceans of the world with iron to help lend a helping hand to other fish species, who have seen a decline in their populations. However, some scientists, who were contacted by Nature, have cautioned that the theory is “far fetched”.

After the salmon population took a nose dive back in 2009, the sockeye salmon made a big comeback in British Columbia’s Fraser River this year. It has been suggested that the reasoning behind this is that the iron in the ash from the volcanic eruption on Kasatochi island, which created a rather huge influx of phytoplankton, may have indirectly provided the salmon with the food they needed to stage a miraculous comeback. This suggestion was made by Tim Parsons, a prominent Canadian scientist, and has a government-awarded medal named after him for ocean scientists.

It looks like he may be getting yet another feather in his hat, if the scientific community chooses to explore this theory further. If its possible to refurnish fish stocks around the globe by seeding the ocean with some iron, we should take the opportunity.

The Fraser River is being overrun by sockeye salmon.

Sockeye Salmon (freshwater coloration)

Officials from the fishery are now estimating that the number of sockeye returning has climbed to roughly 30 million, which is a 5 million increase from their previous count of 25 million earlier this week.

This is the highest number of returning salmon recorded since 1913, when around 39 million sockeye made their way back to the Fraser River, just before a rock slide into the river gave birth to Hells Gate and caused a huge disruption in the stocks of salmon for decades.

The run this year is looking to be almost three times higher than the 11 million originally estimated before the season started.

The late run this year is projected to be large as well, due to the fact that it will include the peak cycle Adam River run.

However, this run has really turned a lot of heads, as the Pacific Salmon Commission this past Friday has raised its estimate of late run sockeye to an astounding 21.4 million, which is a far cry from their 8.5 million prediction prior to the start of the season.

Up till now, more than 6.4 million salmon have swum their way upriver, avoiding the gilnetters on the lower Fraiser, as compared to the 5.7 million which were estimated as having being caught.

And there doesn’t seem to be any sign of a shortage.

It’s good to see mother nature replenishing her stocks, after such a long “dry spell”. Hopefully this is just a taste, and the salmon runs will continue to be as plentiful in the years to come.

The Salmon runs in British Columbia are known to fluctuate, with good years being followed by poorer ones. Since the mid-1990s, most years have however been bad and many explanations for this situation have been offered, from El Nino and too warm streams, to over-fishing and habitat destruction. It is of course tempting for the fishing industry to place the blame solely on natural phenomena like El Nino, but it is hard to turn a blind eye on the immense amounts of salmon caught from the rivers of British Columbia each year.

Take for instance Fraser River, the longest river in British Columbia with a total length of 1,375 km (870 mi) and a drainage area of roughly 220,000 km² (85,000 sq mi). This is a heavily exploited river and the lower reaches are especially affected by habitat destruction brought on by agricultural, industrial and urban developments. The last great salmon run in this river took place as far back as 1913, when an estimated 38 million sockeye salmons returned to spawn. Out of those 38 millions, no less than 32 millions were caught and utilized as food fish. Four years later, the run had been diminished to a mere 8 million sockeyes, but this didn’t stop the government from allowing 7.3 millions of them to be caught. In 2008, an estimated 1.6 million sockeye salmon returned to Fraser River, but despite the extremely low figure the federal Department of Fisheries and Oceans allowed commercial, sport and native fishermen to continue their fishing activities. Since the early 1900s, about 40 to 70 per cent of any given run has normally been allowed to be taken in nets.