from a mother fish for an artificial spawning technology to produce fingerlings. The eggs are screened carefully for quality to ensure success in the next steps of the breeding process.
As giant fish species become scarce in the Mekong River, scientists have put the
protection of these species on their agendas. Pham Thanh Long finds out what it takes to parent a new generation of rare
fish. Scientist Huynh Huu Ngai has a knack for playing God, and his efforts have helped one species of rare fish survive
and boost its population in Cuu Long (Mekong) River. "At this point, I can say that I have successfully managed to
preserve the giant fish species," Ngai said, after more than two years of artificially breeding and raising ca ho, the
giant barb (Catlocarpio siamensis). Ngai has sent thousands of fingerlings and juvenile fish to farms in Mekong Delta
provinces to rejuvenate the species’ development ... Click
It's not easy being
a fish egg! Predators and adverse water conditions kill many before they
even hatch. In fact, only a small percentage of the fish eggs laid in a natural water environment actually live long
enough to add to the fish population. "Natural reproduction is kind of a hit or miss," said Ron Zitzow, manager of the
Valley City National Fish Hatchery, located outside Valley City. Often, bullheads, suckers or birds eat the eggs, said
Ron Manson, biological science technician at the hatchery. Or silt from runoff covers the eggs, depriving them of
oxygen. Changing water levels can leave some fish eggs high and dry.
That's where the National Fish Hatchery System comes in. Between 65 percent and 80
percent of the fish eggs incubated there hatch. "You get a lot higher percentage of survival by doing it through the
hatchery system," Mason said. "You don't have the predators, you don't have the silt."
Changes in growth rates in some coastal and long-lived deep-ocean fish species in the south
west Pacific are consistent with shifts in wind systems and water temperatures, according to new Australian research
published in the United States this week. “We have drawn correlations between the growth of fish species related to
their environmental conditions – faster growth in waters above a depth of 250 metres and slower rates of growth below
1,000 metres,” says lead author, Dr Ron Thresher. “These observations suggest that global climate change has enhanced
some elements of productivity of shallow-water stocks but at the same time reduced the productivity and possibly the
resilience of deep water stocks,” he says. A biological oceanographer with CSIRO’s Wealth from Oceans Research Flagship,
Dr Thresher said the research – published in the latest edition of the US science journal, Proceedings of the National
Academy of Sciences – is based on the examination of fish ear bones, or otoliths, which show similar characteristics to
the growth rings used to date the age of trees. The work was done in collaboration with the Victorian Marine and
Aquatic Fisheries Research Institute, which has specialist skills in analyzing otoliths. Click
Aquatic life, not just the chemicals in the water, will be looked at in depth for the first
time in a study of water quality on Fountain Creek by Colorado State University-Pueblo. The three-year, $1 million study
is still searching for funds for its five-pronged study of Fountain Creek. “We’ve been working on the design of these
experimental studies for some time and have been involving the experts,” Kristina Proctor, dean of science and
mathematics at CSU-Pueblo said Tuesday. “For the breadth of work being done, this is a very comprehensive study. Click
With gold nanoparticles, DNA and some smart chemistry as their tools, scientists at
Northwestern have developed a simple "litmus test" for mercury that eventually could be used for on-the-spot
environmental monitoring of bodies of water, such as rivers, streams, lakes and oceans, to evaluate their safety as food
and drinking water sources. An article detailing the colorimetric screening technology and its success detecting mercury
will be published online April 27 by Angewandte Chemie, the prestigious European journal of applied chemistry. Methyl
mercury, a neurotoxin that is particularly dangerous to young children and pregnant women, is the form of mercury people
ingest when they eat contaminated fish and shellfish. Mercury is released into the air through industrial pollution,
falling into bodies of water and polluting the waters in which fish and shellfish live. Bacteria in the aquatic
environment then convert water-soluble mercuric ion (Hg2+) into methyl mercury, which accumulates in varying amounts in
fish and shellfish. Click here
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