Common carp. Photo by Aquatika Karlovac,

New study reinforces link between gill size and oxygen uptake in fish

Common carp. Photo by Aquatika Karlovac,

Common carp. Photo by Aquatika Karlovac, FishBase

A widely debated topic in biology and fisheries sciences is the role of oxygen in the growth of fishes and other water-breathing animals. According to new research, developmental changes in individual fish and experimental errors are the causes of inconsistencies that have erroneously been linked to the Gill Oxygen Limitation Theory (GOLT), developed to explain the influence of oxygen uptake on fish growth.

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Australian Parvancorina minchami life restoration at MUSE - Science Museum in Trento, Italy

Ancient seafloor creature grew like modern marine invertebrates – study

Australian Parvancorina minchami life restoration at MUSE - Science Museum in Trento, Italy

Australian Parvancorina minchami life restoration at MUSE – Science Museum in Trento, Italy. Image by Matteo De Stefano, Wikimedia Commons.

The growth and lifespan of Parvancorina minchami, small anchor-shaped animals that lived on the seafloor about 550 million years ago, resemble that of current marine invertebrates like golden shrimp and Baltic clam.

New research by a team at the Russian Academy of Sciences, Harvard University and the Sea Around Us initiative at the University of British Columbia shows that P. minchami’s longevity was about four years, that they could reach close to 20 millimetres in length, and that their pace of growth was similar to that of small recent invertebrates.

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Hoi An fish market in Vietnam.

The nutritional toll of climate change on communities in Southeast Asia and the Pacific

Hoi An fish market in Vietnam.

Hoi An fish market in Vietnam. Image by Jean-Marie Hullot, Flickr.


Fish populations and the humans that depend on them for food will continue to feel the brunt of warming waters from climate change.

A recent study by researchers at the Sea Around Us – Indian Ocean, based at the University of Western Australia, the Changing Ocean Research Unit at the University of British Columbia and the University of Miami, shows that even with strong climate mitigation efforts, maximum catch potential is expected to fall by 58–92 per cent in the Pacific Islands and 65–86 per cent in Southeast Asia by the mid to end of the 21st century. These losses will likely result in fisheries failing to meet key micronutrient requirements in these regions’ coastal populations.

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Measuring Baltic herring.

Taking seriously the explanations on shrinking fish in a warming world

Measuring Baltic herring.

Measuring Baltic herring. Photo by Aleksey Kusnetsov, Wikimedia Commons.

As climate change continues to warm and deoxygenate ocean water, the size of fish, aquatic molluscs and crustaceans is showing a concerning reduction pattern. This pattern manifests a life history in which the animals exposed to rising temperatures grow fast when they are young but mature at smaller sizes than before and their final body sizes are also smaller than they used to be.

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