More Studies Underway
Researchers assessed 100-year-old salmon scales to evaluate the health of wild salmon.
The variety and amounts of wild salmon located in Northern B.C. faced a decline to the tune of about 70 per cent in the past century, as revealed by a recent study by Fraser University.
However, to give these findings a more informed background, it is pertinent to briefly examine the nature of salmon.
Understanding The Nature Of Salmons
Salmon is a different type of anadromous fish born in fresh waters of streams and rivers. They swim to oceans as they age and return home to lay eggs during spawning periods. Year after year, salmon in their great millions return to respective home streams after which they produce their next generations of fisheries.
However, it should be noted that certain salmon species embark on several trips in their lifetime, while other species make only one round trip which typically precede their deaths. The last one few decades have seen a decline in certain salmon that usually return to their respective freshwater grounds for mating. Similarly, The number of salmon in specific locations like Northwest, from Washington to Alaska, in the Pacific and North Atlantic has witnessed constant declines
What The Study Found
Researchers following a report about salmon scale of about 100-year-old show that current figures of wild sockeye salmon retreating to the Skeena River are 70% less than it was 100 years back. Diversity of wild salmon in this Skeena watershed also declined by 70% over the past 100 years.
The researchers involved modern genetic devices to salmon scales obtained from commercial fishery between 1913-1947 in order to reconstruct ancient volume and variety of populations to compare with current information.
The survey disclosed that Canada’s second biggest salmon watershed which is the Skeena River once hosted a diverse sockeye salmon portfolio comprising several populations that changed positions yearly, and still the overall stayed relatively stable.
Be that as it may, the Skeena portfolio has greatly deteriorated over the past century, so much that it presently is overwhelmed by a sole population that is largely bolstered by artificial output from breeding channels.
SFU PhD student also a lead author sheds more light on this. According to him, the study gives an unusual illustration of the implication of erosion of these within-species biodiversity since the last century of human impact. That loss
Also, life-cycle diversity has shifted: as populations continue to migrate from freshwater at earlier ages, while staying inside the ocean longer than usual.
John Renolds, SFU professor and co-author, as well as Tom Buell Chair of aquatic conservation also chipped in a thing or two. According to them, rebuilding a variety of sufficient wild populations, i.e retaining operating portfolios, should assist in ensuring that significant salmon watersheds such as Skeena are powerful for global change.
Overall, the research offers insight into status assessments and mobilising action beginning with discussions of salmon populations under threat. This would serve a larger goal of expanding what we know about historical diversity and potentials for production.