There is no known fish species called "freshwater sponge"—freshwater sponges are actually simple aquatic animals (phylum Porifera), not fish, and are not targeted by commercial or recreational fishing industries. If you are referring to a different species, such as freshwater sturgeon, tilapia, or another commonly fished freshwater species, please clarify. However, if the intent is to discuss the harvesting of freshwater sponges themselves, it is important to note that the collection of freshwater sponges is minimal and primarily for scientific or ornamental purposes, rather than for food or commercial fishing. Countries with significant freshwater ecosystems, such as the United States, China, and Russia, may encounter freshwater sponges, but there is no established industry or major "sponge fishing" nations. If you meant a different fish species, please provide the correct name for a detailed response.
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Data from FAO. 2025. Global Capture Production. In: Fisheries and Aquaculture.