Estimated Great Cormorant Predation Reached 52–88% in Tagged Cod and 14–84% in Tagged Flounder
In Genner Bay, Denmark, a PIT-tag study estimated that great cormorants consumed 52–88% of tagged cod and 14–84%…
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News about Great Cormorant
Research, conservation and important developments connected to this species.
Some Great Cormorants Repeatedly Used Fishponds, Others Rivers or Lakes Across Seasons
Some Great Cormorants at Lake Balaton repeatedly foraged at fishponds, while others used rivers or lakes. These individual…
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Microplastics Were Found in 77 of 559 Pellets From Eight Italian Bird Species
An Italian study found 78 microplastic items in 77 of 559 bird pellets. Occurrence was significantly higher at…
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Haplorchis pumilio Was Found in Hamerkops and Great Cormorants in the Lake Victoria Basin
A 2026 Tanzanian study of intestinal trematodes in four fish-eating bird species detected Haplorchis pumilio in hamerkops and…
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Microplastics Were Found in All Studied Cormorant Nestlings and Were Linked to Gut Microbiota
Microplastics were detected in all studied great cormorant nestlings, and their abundance, diversity and size were significantly associated…
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Across 2022–2023, 61.1% of Monitored Great Cormorant Eggs on Giresun Island Produced Fledged Young
Across 525 monitored Great Cormorant nests on Giresun Island in 2022–2023, 1,116 eggs produced 816 hatchlings and 682…
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Bird Diversity Fell After Cormorant Colonies Became Established on Baltic Islands
Annual monitoring from 261 Estonian Baltic islands showed that breeding-bird diversity declined after great cormorant colonies became established…
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Helminth Burdens Fell in Cormorants and Grey Herons as Czech Fishponds Became Carp-Dominated
A 2026 comparison of Czech fishpond birds found strong declines in several helminths in great cormorants and lower…
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9 of 10 Great Cormorants Examined in South Korea Carried a Newly Recorded Tapeworm
Nine of ten resident great cormorants examined in South Korea carried Paradilepis scolecina, the country's first record of…
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