Saving Seafood

Fishing for fun takes a massive bite out of marine life

February 3, 2020 — The volume of fish caught recreationally more than tripled in the 60 years to 2014, and a recent uptick in recreational shark hunting is damaging fragile populations.

The United Nations agency that documents fishing statistics almost exclusively monitors commercial fisheries. To quantify the impact of pleasure fishing, Dirk Zeller at the University of Western Australia in Crawley and his colleagues reconstructed the amount of fish caught annually in 125 countries. The researchers analysed reports from events such as fishing jamborees and gathered data on factors such as the number of licensed recreational fishers per state to scale up to a global estimate.

Read the full story at Nature

Mistake in fisheries statistics shows false increase in catches

February 7, 2018 — Countries’ improvements to their fisheries statistics have been contributing to the false impression that humanity is getting more and more fish from the ocean when, in reality, global marine catches have been declining on average by around 1.2 million tonnes per year since 1996.

A new study in Marine Policy explains why the reconstructed catch  of the Sea Around Us show declining , while the Food and Agriculture Organization of the United Nations claims that catches have been more or less ‘stable’ since the 1990s. The Sea Around Us is a research initiative at the University of British Columbia and the University of Western Australia.

The problem – say authors Dirk Zeller and Daniel Pauly- occurs as an inadvertent side effect of well-intentioned efforts by countries to improve their national data monitoring and reporting systems. As they include new information, for example of a previously unmonitored or poorly-monitored fishery, region or fleet, these new data add additional catches to those of already monitored sectors, thus creating the impression of a growing trend.

But such upward tendencies in catches do not match reality in most countries because often national statistical systems do not correct their new numbers retroactively. This incidental by-product of updates in fisheries data collection systems is what Zeller and Pauly call a “presentist bias,” which means that the emphasis is on the ‘present’ at the expense of the ‘past.’

“In our paper, we use the example of Mozambique where officials reported that small-scale catches ‘grew’ by 800 per cent from 2003 to 2004. This is incorrect. What happened was that the small-scale sector was massively under-represented in the reported data for the longest time and when a new reporting scheme was put in place in the early 2000s, improved catch data by the always-present subsistence and artisanal fisheries were added. A very similar amount of fish was caught in previous years, it was just not registered in the reported data,” says Zeller, who is the lead author of the study and head of the Sea Around Us – Indian Ocean at the University of Western Australia.

Read the full story at PHYS

 

Wasted Fish – What to Make of Recent Data Showing 10% of Fish are Discarded at Sea?

July 12, 2017 — A paper published last week titled, Global marine fisheries discards: A synthesis of reconstructed data, concludes that commercial fishermen have thrown away (discarded) about 10% of catch over the past decade. Researchers, led by Dirk Zeller, used catch reconstructions – estimates of how many fish were caught – to approximate that around 10 million tons of fish are discarded at sea per year. This number is down from a high of 18 million tons in the 1990s.

Zeller et al. 2017  suggest that the decline in discards are a result of declining fish stocks, though they acknowledge that gear and management improvements could also play a role. Indeed, worldwide fish stocks have remained relatively stable since 1990s, indicating that perhaps management and gear technology have played a larger role in reducing discards than researchers propose.

Previously, we have featured an in-depth analysis of discard policy in the EU by Philip Taylor & Griffin Carpenter.

In the below comments we offer 3 different perspectives on fishing discards and the recent Zeller et al. 2017 paper.

Comment by Bill Karp, Affiliate Professor, University of Washington

The recent paper by Zeller et al highlights challenges associated with estimation of discards and interpretation of overall estimates and trends. Their work builds on an extensive body of research, most notably earlier global discard estimates published in 1994 and 2005, and relies heavily on the Sea Around Us database and catch and discard estimation methods outlined by the authors.

Unwanted fish results from almost all fishing . Fishers generally target a species or group of but fishing gear is not perfectly selective for species or size. Regulations may preclude landing of some species and sizes (usually smaller fish), or economic factors may favor retention of larger fish or higher-value species  If the undesired fish are not retained and marketed in some form (e.g. as fish meal for aquaculture feed, or fertilizer) they are generally returned to the sea as discards. This issue is not unique to fishing, waste is a concern in all types of food production. In the United States, roughly 7% of all crops are wasted at the farm (i.e. never harvested), with estimates up to 40% of food waste through the supply chain.

In recent years, waste associated with fisheries discard has become a major public policy issue in some regions, with partial discard bans being implemented in Norway, the European Union, and elsewhere. At the same time, regulatory and operational innovations have resulted in lower discard rates in some fisheries, and demonstrated the potential for broader improvement. Fisheries discard can be reduced by development and use more selective fishing methods, developing markets for unfamiliar species or products, and by regulatory approaches which provide incentives for improved selectivity and/or utilization or even prohibit certain types of discarding.

Zeller et. al. argue that high-grading (discarding of lower-value in favor of higher-value fish) and regulatory discard are major problems and shortfalls of individual transferable quota (ITQ) fisheries. While high-grading and regulatory discarding are substantive causes of discarding, ITQ-type of programs (catch share, rights-based) may include provisions for transferring of quota among participants as well as sharing information that can improve selectivity. These types of programs also reduce or eliminate the race for fish and thereby reduce levels of unwanted fish. They can also encourage accountability, a key to improved catch and discard data. Examples can be found in Alaska and elsewhere.

Read the full report at CFOOD

A Staggering Amount of Fish Is Wasted Each Year

June 28, 2017 — New research shows that industrial fisheries are responsible for dumping nearly 10 million tons of perfectly good fish back into the ocean each year—enough to fill 4,500 Olympic-sized swimming pools. This news comes at a time when nearly 90 percent of the world’s fish stocks are threatened by overfishing.

The research, published in the science journal Fish and Fisheries, shows that roughly 10 percent of the world’s annual catch is tossed back in the ocean. This waste happens for a number of reasons, including fishing practices that damage fish (making them unmarketable), throwing back fish that are too small or out of season, or because only part of the fish needs to be harvested (e.g. Alaska pollock roe). In some cases, fishers caught species they weren’t targeting (called bycatch), or they continue to catch fish even though they’ve caught enough, which they do in hopes of scooping up bigger fish (called high-grading).

“In the current era of increasing food insecurity and human nutritional health concerns, these findings are important,” noted Dirk Zeller, a researcher at the University of Western Australia, a senior research Partner with the Sea Around Us, and the lead author of the new study, in a statement. “The discarded fish could have been put to better use.”

For the study, the researchers examined the amount of fish that has been discarded over the past six decades. Estimates were made for all major fisheries around the world relying on, in the words of the authors, “a wide variety of data and information sources and on conservative assumptions to ensure comprehensive and complete time-series coverage.” Their analysis shows that five million tons of fish were discarded annually in the 1950s, a figure that skyrocketed to 18 tons annually by the late 1980s. This figure dropped to less than 10 million tons over the last decade.

Read the full story at Gizmodo

Ten million tonnes of fish wasted every year despite declining fish stocks

June 26, 2017 — Industrial fishing fleets dump nearly 10 million tonnes of good fish back into the ocean every year, according to new research.

The study by researchers with Sea Around Us, an initiative at the University of British Columbia’s Institute for the Oceans and Fisheries and the University of Western Australia, reveals that almost 10 per cent of the world’s total catch in the last decade was discarded due to poor fishing practices and inadequate management.  This is equivalent to throwing back enough fish to fill about 4,500 Olympic sized swimming pools every year.

“In the current era of increasing food insecurity and human nutritional health concerns, these findings are important,” said Dirk Zeller, lead author for the study who is now a professor at the University of Western Australia and senior research partner with the Sea Around Us. “The discarded fish could have been put to better use.”

Fishers discard a portion of their catch because fishing practices damage the fish and make them unmarketable, the fish are too small, the species is out of season, only part of the fish needs to be harvested—as with the Alaska pollock roe—or the fishers caught species that they were not targeting, something known as bycatch.

“Discards also happen because of a nasty practice known as high-grading where fishers continue fishing even after they’ve caught fish that they can sell,” said Zeller. “If they catch bigger fish, they throw away the smaller ones; they usually can’t keep both loads because they run out of freezer space or go over their quota.”

The study examined the amount of discarded fish over time. In the 1950s, about five million tonnes of fish were discarded every year, in the 1980s that figure grew to 18 million tonnes. It decreased to the current levels of nearly 10 million tonnes per year over the past decade.

The decline in discards in recent years could be attributed to improved fisheries management and new technology, but Zeller and his colleagues say it’s likely also an indicator of depleted fish stocks. A 2016 reconstruction of catch data from 1950 to 2010 by researchers with the Sea Around Us revealed that catches have been declining at a rate of 1.2 million tonnes of fish every year since the mid-1990s.

“Discards are now declining because we have already fished these species down so much that fishing operations are catching less and less each year, and therefore there’s less for them to throw away,” he said.

Read the full story at the University of British Columbia