//
you're reading...

Aquaculture

To fish or not to fish: Exploring China’s seafood production strategies

Citation: Szuwalski C, Jin X, Shan X, Clavelle T. 2020. Marine seafood production via intense exploitation and cultivation in China: Costs, benefits, and risks. PLoS ONE 15(1): e0227106. https://doi.org/10.1371/journal.pone.0227106

China on the global seafood stage

On average, about 17% of animal protein consumed globally comes from seafood. In 2016, China’s seafood production reached 171 million metric tons! There is a huge demand for seafood and it continues to grow. Nations such as Japan, Malaysia, Vietnam and Thailand that rely on seafood need to figure out how to meet this demand.

An example of China’s fishing fleet–Fishing boats depart Shenjiawan port in Zhoushan, Zhejiang province. Photo credit: Stringer China/REUTERS

Different countries have different methods for producing seafood—some countries rely on capturing fish in the wild and others implement aquaculture, or fish farming. Among these countries, China produces the most seafood by both fishing and farming fish and exports a lot of it to other nations. China plans to implement large-scale fisheries management reform and quota-based domestic fisheries management in the future.

A recent study, published in PloS ONE, examined the costs, benefits and risks of China’s seafood production strategies that are built around intense exploitation of the ocean to seewhat has and has not worked for China in the past.

How did the authors carry out this study?

The primary source of data was the Chinese Fisheries Statistics Yearbook. In this yearbook, data are collected via reporting forms filled out by officials at the village or town level. Once all data are compiled, they are entered into a database at the Bureau of Fisheries at the Ministry of Agriculture and published annually. The authors identified differences in the trends in seafood production over time by species or group over time using computer programs to predict how fish numbers change over time.

The data issue

Chinese fishery data have often been questioned in the scientific literature because of high fish estimates from over-reporting of catch data. A possible explanation for China’s high reported catches involves changes in trophic dynamics, or the way the marine food web is structured, as a result of intense fishing. In fact, China’s catch composition has changed from longer-lived, slower growing fish species to shorter-lived, faster growing species which is a direct outcome from indiscriminate, intense fishing.

Even though China has attempted to gather comprehensive fishery catch statistics, there are still issues. These fish are caught by one of the world’s most powerful fleet, so policing and observing catch from the entire fleet is an extremely difficult task. If there are many thousands of fishing boats, how can one be sure that they are reporting the correct statistics? The authors claim that they believe the official fishery data from China but one should be skeptical about these data due to potential reporting issues.

 What did they find?

Schematic of a trawl net being used to fish. Photo credit: Australian Fisheries Management Authority

The authors found that China’s fishing fleets fish primarily with gear such as trawl nets that are dragged behind the boat to collect fish, and gillnets that are suspended vertically in the water and can fish for days or even weeks!

These nets are used in distant water fishing, or fishing far off the coast. There are reports that Chinese vessels have been observed fishing in the exclusive economic zones (EEZ) of 93 coastal countries. These EEZs are where maritime countries have special rights regarding the use of ocean resources in their region—this is a little concerning because it could be seen as taking advantage of smaller coastal nations. However, a potential positive outcome of fishing in other countries’ EEZs is that these other countries could benefit from China’s fishing efforts instead of building their own fishing fleets. Of course, there needs to be regulatory practices in place so there are agreements between China and other maritime countries.

A view of the floating village Sanduao in southeast China’s Fujian province. Photo credit: ImagineChina

Another result from this study is that China’s fish farming techniques, have shifted from the environmentally disruptive monoculturing of growing one species at a time to polyculture systems, where fed species. such as fish and crustaceans, are farmed in close proximity to non-fed species like bivalves and seaweeds. Those non-fed species can filter and reduce waste from the fed species. This is a beneficial switch in China’s fish farming practices because of less waste generation.

Lastly, the authors found that fish farming affects natural fisheries. Fish farms can attract wild fish by providing structure and food to natural populations. In addition, farms may further change the make-up of fish communities by changing habitat resources or impacting what species of baby fish decide to grow in a particular region. China is also enhancing the harvested fish populations by adding fish that were grown in captivity to the wild and constructing artificial reefs to offer more habitat to larval fish. Over 7.8 billion larvae were added to the wild in 2016—that’s a lot of baby fish!

Moving forward

China’s marine seafood production strategies provide one of the world’s largest examples of the predicted tradeoff between seafood production and preserving the environment. There are three benefits to intense capture and cultivation of fish in China: 1) high yields, 2) high employment and 3) low management costs. The downside to this way of producing seafood is overfishing.

A diverse array of fish available in a Chinese market. Photo credit: The Economic Times

Intense fishing currently appears to be a viable strategy in China because a domestic market exists for nearly all species and size of fish, unlike many other seafood markets around the world where a large portion of catches is discarded. A major focus of China’s most recent 5 year plan is to improve the ecological conditions of their oceans.

China’s 2020 goals are to decrease catches from wild capture fisheries to 10 million tons, eliminate 40% of government fisheries subsidies and reduce the fishing fleet by 20,000 vessels. A major focus for these goals will be improved monitoring and enforcement for large fishing fleets and aquaculture systems. The successful development of these methods could be useful for other countries facing pressure to both protect the environment and maintain seafood production.

Discussion

No comments yet.

Post a Comment

Instagram

  • by oceanbites 3 months ago
    Happy Earth Day! Take some time today to do something for the planet and appreciate the ocean, which covers 71% of the Earth’s surface.  #EarthDay   #OceanAppreciation   #Oceanbites   #CoastalVibes   #CoastalRI 
  • by oceanbites 4 months ago
    Not all outdoor science is fieldwork. Some of the best days in the lab can be setting up experiments, especially when you get to do it outdoors. It’s an exciting mix of problem solving, precision, preparation, and teamwork. Here is
  • by oceanbites 5 months ago
    Being on a research cruise is a unique experience with the open water, 12-hour working shifts, and close quarters, but there are some familiar practices too. Here Diana is filtering seawater to gather chlorophyll for analysis, the same process on
  • by oceanbites 6 months ago
    This week for  #WriterWednesday  on  #oceanbites  we are featuring Hannah Collins  @hannahh_irene  Hannah works with marine suspension feeding bivalves and microplastics, investigating whether ingesting microplastics causes changes to the gut microbial community or gut tissues. She hopes to keep working
  • by oceanbites 6 months ago
    Leveling up - did you know that crabs have a larval phase? These are both porcelain crabs, but the one on the right is the earlier stage. It’s massive spine makes it both difficult to eat and quite conspicuous in
  • by oceanbites 7 months ago
    This week for  #WriterWednesday  on  #Oceanbites  we are featuring Cierra Braga. Cierra works ultraviolet c (UVC) to discover how this light can be used to combat biofouling, or the growth of living things, on the hulls of ships. Here, you
  • by oceanbites 7 months ago
    This week for  #WriterWednesday  at  #Oceanbites  we are featuring Elena Gadoutsis  @haysailor  These photos feature her “favorite marine research so far: From surveying tropical coral reefs, photographing dolphins and whales, and growing my own algae to expose it to different
  • by oceanbites 8 months ago
    This week for  #WriterWednesday  on Oceanbites we are featuring Eliza Oldach. According to Ellie, “I study coastal communities, and try to understand the policies and decisions and interactions and adaptations that communities use to navigate an ever-changing world. Most of
  • by oceanbites 8 months ago
    This week for  #WriterWednesday  at  #Oceanbites  we are featuring Jiwoon Park with a little photographic help from Ryan Tabata at the University of Hawaii. When asked about her research, Jiwoon wrote “Just like we need vitamins and minerals to stay
  • by oceanbites 8 months ago
    This week for  #WriterWednesday  on  #Oceanbites  we are featuring  @riley_henning  According to Riley, ”I am interested in studying small things that make a big impact in the ocean. Right now for my master's research at the University of San Diego,
  • by oceanbites 8 months ago
    This week for  #WriterWednesday  at  #Oceanbites  we are featuring Gabby Stedman. Gabby is interested in interested in understanding how many species of small-bodied animals there are in the deep-sea and where they live so we can better protect them from
  • by oceanbites 9 months ago
    This week for  #WriterWednesday  at  #Oceanbites  we are featuring Shawn Wang! Shawn is “an oceanographer that studies ocean conditions of the past. I use everything from microfossils to complex computer models to understand how climate has changed in the past
  • by oceanbites 9 months ago
    Today we are highlighting some of our awesome new authors for  #WriterWednesday  Today we have Daniel Speer! He says, “I am driven to investigate the interface of biology, chemistry, and physics, asking questions about how organisms or biological systems respond
  • by oceanbites 9 months ago
    Here at Oceanbites we love long-term datasets. So much happens in the ocean that sometimes it can be hard to tell if a trend is a part of a natural cycle or actually an anomaly, but as we gather more
  • by oceanbites 10 months ago
    Have you ever seen a lobster molt? Because lobsters have exoskeletons, every time they grow they have to climb out of their old shell, leaving them soft and vulnerable for a few days until their new shell hardens. Young, small
  • by oceanbites 11 months ago
    A lot of zooplankton are translucent, making it much easier to hide from predators. This juvenile mantis shrimp was almost impossible to spot floating in the water, but under a dissecting scope it’s features really come into view. See the
  • by oceanbites 11 months ago
    This is a clump of Dead Man’s Fingers, scientific name Codium fragile. It’s native to the Pacific Ocean and is invasive where I found it on the east coast of the US. It’s a bit velvety, and the coolest thing
  • by oceanbites 12 months ago
    You’ve probably heard of jellyfish, but have you heard of salps? These gelatinous sea creatures band together to form long chains, but they can also fall apart and will wash up onshore like tiny gemstones that squish. Have you seen
  • by oceanbites 12 months ago
    Check out what’s happening on a cool summer research cruise! On the  #neslter  summer transect cruise, we deployed a tow sled called the In Situ Icthyoplankton Imaging System. This can take pictures of gelatinous zooplankton (like jellyfish) that would be
  • by oceanbites 1 year ago
    Did you know horseshoe crabs have more than just two eyes? In these juveniles you can see another set in the middle of the shell. Check out our website to learn about some awesome horseshoe crab research.  #oceanbites   #plankton   #horseshoecrabs 
WP2Social Auto Publish Powered By : XYZScripts.com