Mystery surrounds North Sea crabs as fishing numbers plummet - Science struggles to uncover reasons
The North Sea, a vital fishing ground for many European countries, has been experiencing a decline in its shrimp population. This decrease has led to increased prices for crab sticks in some shops and even the removal of crab products from their shelves.
The Thuenen Institute for Sea Fisheries in Bremerhaven is working diligently to understand the reasons behind the fluctuating North Sea shrimp stocks. Dr. Lara Kim Huenerlage, a marine biologist at the institute, is leading the investigation, aiming to improve forecasting capabilities for a more predictable North Sea shrimp fishery.
The North Sea shrimp reproduces throughout the year and grows quickly, but its short lifespan and vulnerability make it susceptible to environmental conditions. Warm winters can lead to premature hatching of North Sea shrimp offspring, which may not coincide with adequate food supplies or suitable environmental conditions. Additionally, new predators such as jellyfish and squid are affecting the delicate larvae of the North Sea shrimp.
In 2024, the North Sea shrimp catch was 3,340 tons, significantly more than the catch for plaice (661 tons) or sprat (609 tons). However, the catch was about a third of the average amount from 2000 to 2015. The adult population of the North Sea shrimp consists essentially of only one year class, making it particularly susceptible to environmental conditions.
The marine biologist primarily responsible for improving forecasting capabilities is Dr. Miriam Zimmermann. Many unknown and difficult-to-predict factors influence the stock development of the North Sea shrimp, making it a complex issue to tackle. The question of why there are sometimes more and sometimes fewer young North Sea shrimp along the coast remains unanswered.
Dr. Lara Kim Huenerlage and her colleagues collect biological data, consult with fishermen, accompany them on fishing trips, and collaborate with international working groups. Rising water temperatures are putting pressure on the North Sea ecosystem, which also affects the North Sea shrimp.
In 2024, around 25 million euros worth of North Sea shrimp were caught, making up more than half of the total earnings from landings in Lower Saxony and Schleswig-Holstein. The North Sea shrimp is the most important catch for German coastal fishermen.
The North Sea shrimp fishery may become more predictable through improved population forecasting models, according to a working group of the International Council for the Exploration of the Sea. However, the stock development cannot be reliably predicted at this time.
Despite the challenges, researchers like Dr. Lara Kim Huenerlage and Dr. Miriam Zimmermann continue their work to better understand the North Sea shrimp population and find solutions to ensure the sustainability of this vital fishery.
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