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Heat Causes Stress in Fish in Water Bodies

Heat Causes Stress in Fish in Water Bodies
In Saxony, fish in flowing waters are currently suffering the most from high temperatures and low water levels. (File photo) / Photo: Pavlíèek Luboš/CTK/dpa
From: DieSachsen News
Rising temperatures are taking a toll on Saxony's fish: Living conditions for salmon and trout in flowing waters are becoming increasingly difficult. Here's what experts have to say about the situation.

Heat waves and low precipitation are causing increasing stress on fish populations in Saxony’s waters. According to the Saxony Anglers’ Association, salmonids and trout in flowing waters are particularly affected. “For example, there was already a small-scale fish die-off in the Chemnitz River, where a whole series of brown trout perished,” said Martin Schuster, spokesperson for the association, to the German Press Agency in Dresden. 

Low water levels and low precipitation are reportedly creating extremely difficult conditions for the fish in some cases. Water temperatures above 20 degrees could already be life-threatening for some fish species in flowing waters. “They really have to seek out the deeper regions now—that is, the deep sections of the river—where there’s still a bit of oxygen available.” But that’s no longer the case everywhere, according to Schuster.

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State Association: “You should refrain from trout fishing”

However, the state association is not aware of any restrictions for anglers in Saxony’s fishing waters. Water bodies are closed only in absolutely exceptional cases, such as an extraordinary fish die-off. Otherwise, the association relies on its members being competent enough not to put additional pressure on already stressed fish populations. Schuster gave the following example: “Under these circumstances, people really should refrain from trout fishing.”

Georg Stähler, managing director of Teichwirtschaft Wermsdorf, also reports increasingly difficult conditions in the company’s 50 ponds. The primary reason is a lack of water: water levels are low in some cases—ranging from about 50 to 60 percent, depending on the body of water. “The second reason is the heat, which has caused water temperatures to reach around 30 degrees—a condition that has proved fatal for some fish species.” About one metric ton of fish has died so far—primarily pike and sturgeon, Stähler reports. “So this isn’t anything serious for the year as a whole, but it’s still frustrating.”

Pond Farming: Less Feed Leads to Slower Growth

“On top of that, I can’t feed them as much during this time.” That’s because more feed would cause the fish to consume more oxygen—up to five times as much, according to the expert. The result of reduced feeding is that “the fish grow poorly, and that inevitably leads to economic losses because the fish simply don’t reach their target size or growth rate,” says Stähler. Carp are the most accustomed to high water temperatures and would cope better with the conditions.

The situation is not yet critical. However, that could change if there are further heat waves and if significant rainfall continues to be absent. “August is the most critical month—and we’re not there yet.”

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