Which fish & aquarium brands do AI assistants recommend in Japan? Q4 2026
In Japan, AI assistants most often recommend Hikari, Tetra and Sera for fish. Hikari is named by 5 of 5 assistants.
What the data says
Hikari (Kyorin) is the fish & aquarium brand AI assistants recommend most in Japan, taking 33% of all recommendation points across 5 assistants. Tetra follows with 27% and Sera is third with 12.8%.
Hikari's lead over Tetra is 6 points, a clear advantage in how AI shortlists the category.
ChatGPT, Claude, Gemini and Grok put Hikari first, while DeepSeek favours Tetra.
The top five brands hold 82% of recommendations out of 12 brands named in total, so AI answers in this category are highly concentrated.
| # | Brand | Owner | AI share | ChatGPT | Claude | DeepSeek | Gemini | Grok |
|---|---|---|---|---|---|---|---|---|
| 1 | Hikari | Kyorin | 33% | 35 | 35 | 25 | 35 | 35 |
| 2 | Tetra | Spectrum Brands | 27% | 25 | 25 | 35 | 25 | 25 |
| 3 | Sera | Sera GmbH | 12.8% | 12 | 20 | 12 | – | 20 |
| 4 | API | Mars | 5.6% | – | 8 | 8 | – | 12 |
| 5 | JBL | Harman | 4% | 20 | – | – | – | – |
| 6 | GEX | GEX Co., Ltd. | 4% | – | – | – | 20 | – |
| 7 | Kyorin | Kyorin Co., Ltd. | 4% | – | – | 20 | – | – |
| 8 | Comet | Comet | 2.4% | – | – | – | 12 | – |
| 9 | Aqueon | Central Garden & Pet | 2.4% | – | 12 | – | – | – |
| 10 | Guppy | Guppy Aquatics | 1.6% | – | – | – | – | 8 |
| 11 | Marukan | Marukan Co., Ltd. | 1.6% | 8 | – | – | – | – |
| 12 | Sudō | Sudo Co., Ltd. | 1.6% | – | – | – | 8 | – |
Questions about AI fish & aquarium recommendations
- Which fish & aquarium brand does ChatGPT recommend most in Japan?
- ChatGPT recommends Hikari most often for fish & aquarium in Japan. Across all assistants, Hikari leads with 33% of recommendations.
- Which fish & aquarium brand is improving fastest in Japan?
- Tetra has the strongest momentum among challengers: AI names it first in 1 of 5 answers where it appears, while holding 27% share. This is the first Q4 2026 reading; change over time will be shown from the next update.
- How is the ranking calculated?
- We ask each AI assistant the questions shoppers ask in each category and market, record the top five brands it names, and give 35, 25, 20, 12 and 8 points for positions one to five. Share is a brand's points divided by all points awarded.
Fish: AI rankings by country
Covers: Fish Food.
Method: each AI assistant is asked the shopper questions for every segment in the category and market; the top five brands named score 35, 25, 20, 12 and 8 points. Share is a brand's points divided by all points awarded. Rankings reflect AI answers, not sales.
See how your brand ranks in AI answers.
Get a free report: where AI names you, where it leaves you out, and the product page, pack and message fixes that change it.