A recent paper authored by the Sea Around Us’ PI, Dr. Daniel Pauly, research assistant, Elaine Chu, and Dr. Johannes Müller from Leiden University, has made the cover of the June print issue of the Journal of Fish Biology, where it was introduced by a brief essay in the ‘Between the Covers’ section. The image that illustrates it is that of a large mythical sea creature known as an Aspidochelone, which appeared in a French bestiary around 1270 A.D.
Tag: GOLT
Marine sharks and rays ‘use’ urea to delay reproduction

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.
Respiratory stress response that stunts temperate fish also affects coral reef fish

Gray snappers in Santa Cruz Beach. Photo by Laszlo Ilyes, Wikimedia Commons.
Coral reef fish –like the fish in other marine and freshwater ecosystems – are likely to reach smaller maximum sizes and start reproducing earlier with smaller and fewer eggs as climate change continues to warm up the ocean.
Once they have laid their eggs, fish become ‘young’ again

Herring spawn. Photo by Moosealope, Flickr.
The physical relief that temperate fish like cod and Atlantic herring experience after they spawn for the first time allows them to breathe in more oxygen and develop a voracious appetite, all of which leads to a rapid increase in body weight.
Toward a one-day conference devoted to the Gill-Oxygen Limitation Theory

Bighead carp gill rakers. Photo by Invasive Carp Regional Coordinating Committee, Flickr.
At the last annual meeting of the FishBase Consortium, held 5-7 September 2023 in Tervuren, Belgium, it was decided that the next FishBase/SeaLifeBase Symposium, traditionally held before the FishBase Consortium meeting, to be held in early September 2024 in Thessaloniki, Greece, would last two days, with the first devoted to a session on the Gill-Oxygen Limitation Theory, or GOLT.