Sentences with phrase «fish biomass»

That's the largest absolute increase in fish biomass ever measured in a marine reserve anywhere in the world.

After the establishment of the Cabo Pulmo National Marine Park — and more than 10 years of local enforcement of no - take inside its boundaries — the Scripps Institution of Oceanography found that the amount of fish biomass in the protected area had increased more than fivefold, and shark biomass, tenfold.

The abundance and distribution of fish biomass in the ocean is estimated, by coupling a fish food web model to ocean physics and biogeochemistry simulations covering the past 60 years.

• The authors found that 83 percent of the 832 reefs surveyed contained less than the 500 kilogram fish biomass threshold needed to maintain ecological integrity and stave off decline.

According to a study published in the journal Conservation Biology by a group of scientists from the University of Notre Dame, Resources for the Future, U.S. Forest Service, University of Michigan and the NOAA Great Lakes Environmental Laboratory, if bighead and silver carp were to establish in Lake Erie, local fish biomass is not likely to change beyond observations recorded in the last 3 decades.

• Coral reefs that maintained 500 kilograms of fish biomass per hectare (about 50 percent of an average reef's carrying capacity) were found to maintain ecological functions while sustaining local fisheries, providing fishers and marine managers with a critical target.

-- Life in the oceans are under severe stress and 90 % of the big fish biomass is already fished out, plus ocean acidification is occurring which threatens entire bio webs.

A healthy unfished reef is inhabited by top predators like sharks and grouper and total fish biomass is roughly 500 grams per square meter.

In addition to sampling the water and plastic, Rochman used a special net to collect around 660 lanternfish — a ubiquitous family of small bioluminescent fish that make up around 65 per cent of all deep sea fish biomass.

This, together with current trawling technology, was largely responsible for destroying one of the world's largest fish biomasses — 4 million tonnes of cod resources on the Canadian Grand Banks.

A 2009 paper in Science estimates, for the first time, the total world fish biomass as somewhere between 0.8 and 2.0 billion tonnes.

Scientists at Oregon State University, Simon Fraser University and other institutions have shown in both computer models and 18 months of field tests on reefs that reducing lionfish numbers by specified amounts — at the sites they studied, between 75 - 95 percent — will allow a rapid recovery of native fish biomass in the treatment area, and to some extent may aid larger ecosystem recovery as well.

Today, with over five times more fish biomass than when it was first established, Cabo Pulmo is an oasis in an underwater desert, with massive schools of fish and vibrant coral reefs that some say comprise the most robust MPA in the world.

If this region is to provide adaptive potential to climate change, fishing at a sustainable level and maintaining reef fish biomass, life histories, and functions is a high priority.»

The analysis included marine reserves and fishing closures as a control for estimating healthy fish biomass along with numerous sites along a spectrum of fishing intensity, from heavily fished reefs in the Caribbean to locations with low fishing rates and high fish «biomass» such as the Easter Islands.

The authors assessed fish biomass and functional groups from more than 800 coral reefs worldwide and used them to estimate recovery periods for both lightly fished and overfished reefs.

Approximately 64 percent of coral reefs with fishing regulations (including bans on specific fishing gear such as small - mesh nets and restrictions on fishing of herbivorous species) were found to maintain more than 50 percent of their potential fish biomass.

A study conducted near San Luis Obispo, California showed that when kelp was removed from a nearby reef, fish biomass declined by 63 %.

If bighead and silver carp were to establish in Lake Erie, local fish biomass is not likely to change beyond observations recorded in the last three decades, according to a study published in the journal Conservation Biology on Thursday (Aug. 6) by a group of scientists from the University of Notre Dame, Resources for the Future, U.S. Forest Service, University of Michigan and the NOAA Great Lakes Environmental Laboratory.

Coral reefs that maintained 500 kilograms of fish biomass per hectare (about 50 percent of an average reef's carrying capacity) were found to maintain ecological functions while sustaining local fisheries, providing fishers and marine managers with a critical target.

About this, however: — Life in the oceans are under severe stress and 90 % of the big fish biomass is already fished out, plus ocean acidification is occurring which threatens entire bio webs.

Carp now account for up to 90 % of fish biomass in some areas of the Basin.

«Simply stated, fish biomass in coral reefs is being reduced by fishing pressure.

The authors recommend that these coral refuge areas maintain a fish biomass of greater than 500 kilograms per hectare, which, as previously published WCS research shows, is the threshold to maintain ecological functions while sustaining local fisheries.

• The fish biomass threshold for a collapsed reef — overfished to the point of nearly total ecosystem failure — is 100 kilograms per hectare.

«By linking fisheries to ecology, we can now make informed statements about ecosystem function at a given level of fish biomass.»

• According to the analysis, a coral reef with no fishing averages 1,000 kilograms per hectare of fish biomass.

Yet, the average reef has only 20 grams per square meter — obviously an extreme decrease in fish biomass.

With a single fish capable of producing more than one million eggs in a breeding cycle, carp now make up an estimated 80 — 90 % of the fish biomass in parts of the Murray — Darling Basin, the breadbasket region of southeast Australia...