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The earbones, or 'otoliths', help fish to detect movement and to orient
themselves in the water. Otoliths set down annual growth rings that can
be measured and counted to estimate the age and growth rates of fish.
"Otoliths can form the basis of new techniques for modelling fish
growth, productivity and distribution in future environments," said Dr
John Morrongiello of CSIRO's Wealth from Oceans Flagship, lead author of
a paper published online in Nature Climate Change November 28. "They
are widely used to support fishery stock assessments, and are beginning
to be used to measure and predict ecological responses to ocean warming
and climate change. "Any change identified in growth and age
maturity, especially of commercially-important species, clearly has
implications for forecasting future stock states and
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Anas
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Date:
2012-12-11
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Probiotics like those found in yogurt are not only good for people --
they are also good for fish. A new study by scientists at the Institute
of Marine and Environmental Technology found that feeding probiotics to
baby zebrafish accelerated their development and increased their chances
of survival into adulthood.
This research could help increase the success of raising rare
ornamental fish to adulthood. It also has implications for aquaculture,
since accelerating the development of fish larvae--the toughest time for
survival--could mean a more efficient and safe system for bringing fish
to the dinner table. Tiny zebrafish are often used in genetic
research because scientists can easily track changes in their
development and the fish grow quickly. They also share many of the same
genes as humans and can be used for studying cellular and physiological
process
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561
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Anas
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Date:
2012-12-11
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Billy Ocean may not have been thinking of fish when he wrote "The Color
of Love," but Sophie Hutter, Attila Hettyey, Dustin Penn, and Sarah Zala
from the Konrad Lorenz Institute of Ethology of the University of
Veterinary Medicine, Vienna were able to show that zebrafish males and
females both wear their brightest colours while wooing a mate. Elaborate secondary sexual displays are often overlooked because many
species attract mates through sensory modalities imperceptible to
humans, including ultraviolet light, ultrasound, electrical signals, or
pheromones. Also, sexual coloration may only be expressed briefly during
courtship (ephemeral courtship dichromatisms) to avoid attracting
predators. Zebrafish (Danio rerio) are a widely studied model
organism, though there have been few studies on their mating behaviour.
Like many schooling fish, zebrafish do not appear sexually dichromatic
to h
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483
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Anas
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Date:
2012-12-11
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