A Japanese aquarium, specifically Hakone-en Aquarium, switched to cheaper fish due to rising costs, and the penguins there refused to eat the cheaper fish.
A Japanese aquarium was forced to buy cheaper fish in a bid to save money. The penguins refused to eat the cheaper fish.

Internet Delights at Penguins Who Refuse to Eat Cheaper Fish at Japan Zoo - Newsweek
Source: newsweek.com
Key Evidence
Reports from reputable news organizations like CNN and Newsweek confirm that Hakone-en Aquarium switched to cheaper fish due to budget constraints and that penguins refused to eat the new diet.
newsweek.comnewsweek.comInternet Delights at Penguins Who Refuse to Eat Cheaper Fish at Japan Zoo
cnn.comcnn.comPenguins at a Japanese aquarium are being fed cheaper fish - and they aren’t... Video evidence circulating online also shows penguins turning away from the cheaper fish.
upworthy.comupworthy.comPicky penguins at Japanese aquarium are refusing to eat 'cheap fish' after...
What the Evidence Shows
The claim consists of two main components: first, that a Japanese aquarium was forced to buy cheaper fish to save money, and second, that the penguins refused to eat this cheaper fish. Multiple independent sources confirm that Hakone-en Aquarium in Japan faced rising food costs and switched from feeding their penguins the usual fatty Japanese horse mackerel (aji) to a less expensive fish, saba (mackerel), as a cost-saving measure.upworthy.comupworthy.comPicky penguins at Japanese aquarium are refusing to eat 'cheap fish' after...
newsweek.comnewsweek.comInternet Delights at Penguins Who Refuse to Eat Cheaper Fish at Japan Zoo
vice.comvice.comPenguins Refuse to Eat Cheaper Fish After Aquarium Cut Cost to Fight Inflation
The penguins' refusal to eat the cheaper fish has been documented in videos and widely reported by reputable news outlets such as CNN and Newsweek.newsweek.comnewsweek.comInternet Delights at Penguins Who Refuse to Eat Cheaper Fish at Japan Zoo
cnn.comcnn.comPenguins at a Japanese aquarium are being fed cheaper fish - and they aren’t... The behavioral response of the penguins, turning away or ignoring the cheaper fish, is consistent across reports. This indicates that the claim is factually accurate.
While the motivation for the aquarium's decision is economic pressure due to inflation and rising food prices, the penguins' refusal is an observed animal behavior rather than a subjective interpretation. There is no evidence contradicting these events or suggesting fabrication. The claim is straightforward and supported by multiple credible sources with no significant nuance or alternative explanations undermining it.