Thousands of goldfish removed from Twin Cities lake - Southernminn.com
Thousands of goldfish removed from Twin Cities lake - Southernminn.com |
| Thousands of goldfish removed from Twin Cities lake - Southernminn.com Posted: 03 Nov 2020 11:37 AM PST  A small fish that was once someone's pet has turned into a big problem in a Twin Cities lake. Staff with the Carver County Water Management Organization removed tens of thousands of goldfish last week from an inlet connected to Big Woods Lake, part of the Grace Chain of Lakes in Chaska. The brightly colored species commonly found in pet stores and aquariums was first discovered in Big Woods Lake in April 2019. It's believed that a few of the non-native fish were intentionally dumped into the lake, where they have quickly reproduced. "The most likely scenario is that somebody or a couple people released goldfish, and they're exceedingly hardy fish," said Madeline Seveland, a spokesperson with the Carver County Water Management Organization. Big Woods Lake has relatively poor water quality and few other predatory fish species, conditions that have allowed the goldfish to multiply. Carver County Water Management Organization staff netted and removed some goldfish from a small pool between Big Woods and Hazeltine lakes last spring. Then, on Oct. 26, they netted a massive haul — an estimated 50,000 goldfish from the inlet channel. The removal is part of a three-year plan to study and manage the invasive species, said Andrew Dickhart, aquatic invasive coordinator for the water management organization. Staff have captured and tagged about 500 goldfish to track their movements, "so we can monitor their behavior and where they're aggregating, where they're spawning," he said. They plan to use electrofishing, or temporarily stunning fish with an electric current, to get a better estimate of their population size, Dickhart said. And they plan to age-test some of the fish, to learn how quickly they are reproducing. "If we're going to remove the fish, we need to keep track of a percentage of the population that we're removing, until we can get it down to a certain level where that population may no longer be harmful to the lake ecosystem," he said. However, there's been relatively little research done on goldfish, so it's not clear what that threshold is. Goldfish haven't gotten as much attention as invasive carp, but they are causing significant problems in parts of Europe, Canada and Australia as well as the United States, said Peter Sorensen, a fisheries biologist professor at the University of Minnesota. "It just hasn't reached a high level of awareness," he said. "They don't jump and knock people out of boats and break bones. But it's a global issue." They are extremely resilient fish that can survive harsh conditions, including lakes with poor water quality, Sorensen said. "They're perhaps the only vertebrate animals that can live without any oxygen, which is remarkable," he said. "They can go what we call totally anaerobic, and they just live off sugars and produce alcohol." With that ability, goldfish are able to survive in shallow lakes that completely freeze over in the winter, Sorensen said. "If there are not many other fish in the lake — because most fish can't stand the conditions that goldfish do really well in — then they just take off," he said. Goldfish are a type of crucian carp and share many of the same habits — stirring up sediments at the bottom of a lake, uprooting plants while feeding and competing with native fish for food. There hasn't been much research on the impacts of goldfish on a lake's ecosystem, Dickhart said. "The question that we're trying to answer is, how much is this rough fish problem contributing to the poor water quality of the lake?" he said. "If we remove a certain amount of these fish and all of the sudden we start to see the lake rebound, then we have evidence that this really was the driving factor." Once they've figured out where the goldfish are moving and spawning, staff also will be looking at ways to control them, Dickhart said. Possible methods include stocking native predator fish or installing barriers in areas where goldfish are known to reproduce. Staff also hope to educate people to never release any kind of domesticated animal into the wild. Owners who can't keep a pet any longer should return it to the pet store or take it to a surrender event, often hosted by the Minnesota Aquarium Society. "We don't want to put all these resources in and remove these fish and get the lake back to a stable system, and then just have this happen all over again," Dickhart said. |
| Posted: 04 Nov 2020 03:17 AM PST Aquarium Accessories market is inclusive of an in-depth evaluation of this industry, and a commendable brief of its segmentation. The report, in a nutshell, incorporates a basic overview of the market with respect to its current status and the market size, with regards to its volume and revenue. Also, the study is inclusive of a summary of important data considering the regional scope of the industry as well as the firms that seem to have strongly established their position across the Aquarium Accessories market. Request for a sample of this research report @ https://www.orianresearch.com/request-sample/1603619 What You Can Expect From Our Report:
Purchase Directly @ https://www.orianresearch.com/checkout/1603619 Market segment by Type, the product can be split into No of Pages: 120 What are the market factors that are explained in the report?
A succinct overview of the regional terrain of the Aquarium Accessories market:
Major Regions that plays a vital role in Aquarium Accessories market are: North America Europe China Japan Middle East & Africa India South America Others The key players covered in this study, Aqua Design Amano, EHEIM, Arcadia, Clear-Seal, Juwel Aquarium, Marukan, Hagan, TMC, Interpet, AZO Table of Contents: 1 Aquarium Accessories Introduction and Market Overview 2 Industry Chain Analysis 3 Global Aquarium Accessories Market, by Type 3.1 Global Aquarium Accessories Value ($) and Market Share by Type (2014-2020) 3.2 Global Aquarium Accessories Production and Market Share by Type (2014-2020) 3.3 Global Aquarium Accessories Value ($) and Growth Rate by Type (2014-2020) 3.4 Global Aquarium Accessories Price Analysis by Type (2014-2020) 4 Aquarium Accessories Market, by Application 4.1 Global Aquarium Accessories Consumption and Market Share by Application (2014-2020) 4.2 Downstream Buyers by Application 4.3 Global Aquarium Accessories Consumption and Growth Rate by Application (2014-2020) 5 Global Aquarium Accessories Production, Value ($) by Region (2014-2020) 6 Global Aquarium Accessories Production, Consumption, Export, Import by Regions (2014-2020) 7 Global Aquarium Accessories Market Status and SWOT Analysis by Regions 8 Competitive Landscape 9 Global Aquarium Accessories Market Analysis and Forecast by Type and Application 10 Aquarium Accessories Market Analysis and Forecast by Region 11 New Project Feasibility Analysis 11.1 Industry Barriers and New Entrants SWOT Analysis 11.2 Analysis and Suggestions on New Project Investment 12 Research Finding and Conclusion 13 Appendix 13.1 Discussion Guide 13.2 Knowledge Store: Maia Subscription Portal 13.3 Research Data Source 13.4 Research Assumptions and Acronyms Used About Us: |
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