June 20, 2013 | 01:35 AM (BD Time)
20 June, 2013 Thursday
Afghan President Karzai to boycott talks with Taliban ; ACC a toothless tiger : Chairman ; Obama to call for nuclear cuts in Berlin speech ; NSA director says plot against Wall Street foiled ; Israeli premier: pressure on Iran must continue ; DCC elections after Eid-ul-Fitr : EC ; 18-party to stage demo countrywide on June 22 ; ;
Fish shrinkage probed in lab
Scientists are starting a novel project to investigate whether overfishing alters fish behaviour and changes their pattern of development. Overexploitation of stocks has already been shown to select for smaller fish. A team reporting at the meeting of the European Society for Evolutionary Biology in Germany will deliberately remove the largest individuals from populations of lab-bred guppies. The experiment is designed to uncover what is happening in our oceans.
"There are clear indications that almost all... commercial fish are shrinking," said marine biologist Carl Lundin, who directs the International Union for the Conservation of Nature's Global Marine and Polar Program. For mass spawning fish such as cod, there is a great advantage to maintaining older, larger females because they are very efficient at restocking the population.
And if industrial fishing selectively removes the largest individuals, explained Dr Lundin, the industry suffers as populations are reduced to the smallest fish.
However, smaller seafood is unlikely to be the only consequence of industrial fishing; research has also shown that fish in the oceans are reproducing earlier.
Now evolutionary biologist Beatriz Diaz Pauli and her colleagues from the University of Norway have begun an experiment that they hope will help uncover what other changes we can expect to see in the oceans' fishes. The team established nine populations of guppies, each comprising 500 to 900 individuals.
Art and Culture
Focus on Chittagong
Fashion & Beauty
Food and Drink
Law and Justice
New Nation Supplement
Editor: A.M. MUFAZZAL, Managing Editor: ARSHAD HOSEIN. Printed and published by MAINUL HOSEIN from the New Nation Printing Press. 1.R.K Mission Road, Dhaka-1203 Phones: New Nation PABX: 7122654, 7114514, 7122655, Fax: 880-2-7122650, 9512775 email: email@example.com, firstname.lastname@example.org for advertisement, email@example.com.