WASHINGTON - Five hundred species of fish change sex in adulthood, often in response to environmental cues, researchers have found.
"I've followed the bluehead wrasse for years because sex change is so quick and is triggered by a visual cue. How sex can reverse so spectacularly has been a mystery for decades. The genes haven''t changed. So it must be the signals that turn them off and on," said Prof Jenny Graves, one of the researchers of the study.
Bluehead wrasses live in groups, on coral reefs of the Caribbean. A dominant male with a blue head protects a harem of yellow females. If the male is removed, the biggest female becomes male in just 10 days. She changes her behavior in minutes and her color in hours. Her ovary becomes a testis and by 10 days it is making sperm.
New tracking devices inserted into Atlantic salmon reveal that up to 48 per cent of the critically endangered fish are being eaten while leaving Nova Scotia's Stewiacke River on their ocean migration.
The insight is the result of acoustic tags that can tell when a tagged fish has been eaten.
"It certainly is high, and it's somewhat higher than some work that was done by some colleagues of mine about 10 years ago using similar tags, but without the predation detecting capability," says David Hardie, a marine biologist with the Department of Fisheries and Oceans.
The open ocean is calling to aquaculture as a new frontier, and scientists are optimistic for the future of the industry.
Cawthron Institute aquaculture scientist Kevin Heasman said open or "exposed" ocean aquaculture, which Cawthron had been studying since 2003, had "huge potential" for existing industry organisations and for newcomers who didn't have access to sheltered coastal areas.
Open ocean farming had the potential to turn vast swathes of the ocean into productive space with minimal negative impact on the environment, and potentially provide greater resilience in the face of climate change, Heasman said.
Maine’s lobster fishermen will be able to use a new species of bait fish to try to get through a herring shortage that has troubled the industry in recent years.
Lobstermen typically bait traps with Atlantic herring, but federal fishery regulators have enacted dramatic cutbacks to the catch quotas for that fish. The Maine Department of Marine Resources said Thursday it has approved the blackbelly rosefish as a new species that can be sold and used as lobster bait in the state.
The blackbelly rosefish is an abundant species that ranges from Canada to South America. Cooke Aquaculture, a New Brunswick, Canada-based company, requested Maine’s approval to sell rosefish as bait, and the company announced plans to harvest the fish off Uruguay.
HÀ N?I – The domestic shrimp industry considers the EU-Vi?t Nam free trade agreement (EVFTA) a good chance to boost exports to the EU market, according to the Vi?t Nam Association Seafood Exporters and Producers (VASEP).
Especially, tariffs on frozen prawn exported from Vi?t Nam to the EU will fall from 20 per cent at present to zero as soon as the agreement comes into effect.
The tariffs for other shrimp products are reduced according to the 3-5 year roadmap, while processed shrimp products will have a seven-year tariff reduction schedule, excluding canned tuna and fish balls with a tariff quota of 11,500 tonnes each, VASEP said.
BÌNH THU?N The south-central province of Bình Thu?n has caught and bred more than 100,000 tonnes of fish and other aquatic species in the first half of the year, up 2.02 per cent against the same period last year.
Favourable weather and the appearance of a large quantity of pelagic fish in waters offshore contributed to the increase.
Fishermen in the province, one of the country's largest fishing grounds, caught 93,000 tonnes of aquatic species in the period, up 2 per cent against the same period last year.
GEORGE TOWN - The Penang government has given its assurance that the welfare of fishermen would not be marginalised when the sea reclamation project in the southern waters of Penang is implemented.
Chief Minister Chow Kon Yeow said fishermen could still go to sea when the Penang South Reclamation (PSR) project is carried out and the fishermen and their families would be given employment opportunities in the project.
“I believe the process of gathering views and objections had taken place several years earlier as the Environmental Impact Assessment report has been approved and the next phase would be on how to implement the project.
ANKARA - Most of the Filipinos want their government to assert a right on the islands in the West Philippine Sea, Anadolu Agency reported, citing a survey revealed Friday 12ve of July 2019.
The survey by Social Weather Stations, a Philippines-based advocacy group, said that 87 per cent of adult population of the country agreed that Manila "should assert its right to the islands in the West Philippine Sea as stipulated in the 2016 decision of the Permanent Court of Arbitration.”
The body of water is commonly referred as South China Sea, where China is accused of expanding its military dominance. The countries surrounding the sea are often engaged in maritime dispute with Beijing.
Spread over 3.5 million square kilometers (1.35 million sq miles), the South China Sea is one of the world’s busiest shipping routes and covers a vast reserve of gas and oil.