I came across the following news report from a few days ago: Staff at Tokyo Sea Life Park are baffled by the deaths of over 150 fish in one of its display tanks. The aquarium has just one surviving fish — a bluefin tuna — left in the giant 30m/98ft Voyagers of the Pacific exhibit that up until December last year held almost 160 fish: bluefin tuna, mackerel tuna and striped bonito. Staff are unable to find out why the population in the tank has suddenly crashed. Only 30 fish were left alive by the middle of January and earlier this week the body of one of the two remaining fish was removed. Investigation is under way, looking at a range of possibilities including lighting, noise and vibration levels, nutrition, and toxins. Computers to monitor both the water and the fish found no abnormalities. "An earlier examination has found some sort of virus among some of the dead fish, but it wasn’t the kind that is usually fatal in fish farms," a spokesman said.
Tokyo Sea Life recently went out and acquired some wild-caught snail specimens. No clue what species they are, they don't look like any native Japanese freshwater snail. If anyone could ID the snail, would be much appreciative. https://twitter.com/KasaiSuizokuen/status/1549230184657977344
From the text with the photos: Marutanishi (Cipangopaludina chinensis laeta) and Himetanishi (Sinotaia quadrata).
The common murres and tufted puffins have laid eggs! https://twitter.com/KasaiSuizokuen/status/1549626764422414336
Two big pieces of news! First of all, there is a new coral reef exhibit! Not many species are mentioned, but I could ID blue-green chromis and pyramid butterflyfish (which are mentioned on the blog post) Second of all, the scalloped hammerheads, cownose rays, blacktip reef sharks, whitecheek sharks, Japanese pilchards, and Japanese bullhead sharks have all been moved to a different tank in the aquarium. Don't know which one specifically, they don't mention it. https://twitter.com/KasaiSuizokuen/status/1551432151861760001
Tokyo Sea Life Park is hosting a Valentine's event centered around fish reproduction. 2/11、12 バレンタイン特別企画スイートツアー「海の中のオス♂メス♀事情」
The aquarium recently collected some mikado comb jellies (Bolinopsis mikado), which are now on display. https://twitter.com/KasaiSuizokuen/status/1625769883568050177
According to the latest issue of Sea Life News, a group of painted greenlings (Oxylebius pictus) recently hatched. https://www.tokyo-zoo.net/zoo/kasai/sealifenews/sealifenews_108.pdf
A very rare trumpetsnout (Macrorhamphosodes uradoi) is now on display at the aquarium's deep sea section. https://twitter.com/KasaiSuizokuen/status/1629288347842785281
