Marine sharks and rays 'use' urea to delay reproduction, finds study
Urea—the main component of human urine—plays an important role in the timing of maturation of sharks, rays and other cartilaginous fish.
Urea—the main component of human urine—plays an important role in the timing of maturation of sharks, rays and other cartilaginous fish.
Plants & Animals
18 hours ago
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106
Hundreds of thousands of fish have died in a reservoir in southern Vietnam's Dong Nai province, with locals and media reports suggesting a brutal heat wave and the lake's management are to blame.
Ecology
May 1, 2024
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28
After nearly a century of people building dams on most of the world's major rivers, artificial reservoirs now represent an immense freshwater footprint across the landscape. Yet, these reservoirs are understudied and overlooked ...
Ecology
Apr 29, 2024
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2
The social and environmental impact of the Belo Monte dam and hydroelectric power plant in Pará state, Brazil, has been called a "disaster" by researchers, environmentalists and several media outlets. The damage has again ...
Social Sciences
Apr 29, 2024
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1
Cichlid fishes exhibit differing degrees of curiosity. The cause for this lies in their genes, as reported by researchers from the University of Basel in the journal Science. This trait influences the cichlids' ability to ...
Evolution
Apr 25, 2024
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66
A University of Adelaide study of shallow-water fish communities on rocky reefs in south-eastern Australia has found climate change is helping tropical fish species invade temperate Australian waters. The work is published ...
Ecology
Apr 23, 2024
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1
Living beings can evolve to lose biological structures due to potential survival benefits from such losses. For example, certain groups of ray-finned fishes show such regressive evolution—medakas, minnows, puffera, and ...
Plants & Animals
Apr 23, 2024
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20
Understanding the relationship between mitochondrial DNA (mtDNA) and animal growth could provide valuable information for selective breeding in aquaculture. However, the complex interactions between genetics and environmental ...
Plants & Animals
Apr 22, 2024
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11
A heart attack will leave a permanent scar on a human heart, yet other animals, including some fish and amphibians, can clear cardiac scar tissue and regrow damaged muscle as adults.
Plants & Animals
Apr 19, 2024
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58
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.
Plants & Animals
Apr 18, 2024
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6
Tetrapods
A fish is any aquatic vertebrate animal that is typically ectothermic (or cold-blooded), covered with scales, and equipped with two sets of paired fins and several unpaired fins. Fish are abundant in the sea and in fresh water, with species being known from mountain streams (e.g., char and gudgeon) as well as in the deepest depths of the ocean (e.g., gulpers and anglerfish).
Food prepared from fish is also called fish, and it is an important food source for humans. They are harvested either from wild fisheries (see fishing) or farmed in much the same way as cattle or chickens (see aquaculture). They are also exploited by recreational fishers and fishkeepers, and are exhibited in public aquaria. Fish have had a role in many cultures through the ages, ranging from deities and religious symbols to the subjects of books and popular movies.
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