Forty-year-old concepts around fish respiration regain prominence in light of climate change

Forty-year-old concepts around fish respiration regain prominence in light of climate change

Forty-year-old concepts around fish respiration regain prominence in light of climate change

Common carp. Photo by Bernard Spragg. NZ, Wikimedia Commons.

Before Dr. Daniel Pauly, now the principal investigator of the Sea Around Us initiative at the University of British Columbia, became a doctoral student, he spent two years doing fisheries work in Indonesia.

Having done his academic studies in Germany, he was surprised to discover a near absence of information on the growth of tropical fish. Thus, upon his return to Kiel University’s Institute of Marine Sciences, he decided to find out how fish grew; the idea was that if general patterns emerged, they could be applied to the many species in Indonesia and elsewhere in the tropics.

His doctoral dissertation was, consequently, built around identifying the factors that govern fish growth.

Continue reading

Blacktip reef shark

Marine sharks and rays ‘use’ urea to delay reproduction

Blacktip reef shark

Blacktip reef shark. Photo by Ray in Manila, Flickr.

Urea – the main component of human urine – plays an important role in the timing of maturation of sharks, rays and other cartilaginous fish.

A new study by researchers with the Sea Around Us initiative at the University of British Columbia’s Institute for the Oceans and Fisheries found that high urea concentrations common in cartilaginous fish, particularly oviparous marine species, allow them to mature and begin to reproduce at a larger fraction of their maximal size.

Continue reading