AI-recommended fish & aquarium brands: rankings in 18 countries
Worldwide, AI assistants most often recommend Tetra, Hikari and Sera for fish. Tetra is named by 5 of 5 assistants.
What the data says
Tetra (Spectrum Brands) is the fish & aquarium brand AI assistants recommend most worldwide, taking 33.4% of all recommendation points across 5 assistants. Hikari follows with 19.4% and Sera is third with 11.4%.
Tetra's lead over Hikari is 14 points, a clear advantage in how AI shortlists the category.
Every assistant tested (ChatGPT, Claude, DeepSeek, Gemini and Grok) puts Tetra first.
The top five brands hold 77% of recommendations out of 61 brands named in total, so AI answers in this category are highly concentrated.
| # | Brand | Owner | AI share | ChatGPT | Claude | DeepSeek | Gemini | Grok |
|---|---|---|---|---|---|---|---|---|
| 1 | Tetra | Spectrum Brands | 33.4% | 1045 | 950 | 1010 | 925 | 1110 |
| 2 | Hikari | Kyorin | 19.4% | 682 | 542 | 532 | 490 | 686 |
| 3 | Sera | Sera GmbH | 11.4% | 280 | 285 | 370 | 383 | 400 |
| 4 | API | Mars | 6.3% | 189 | 89 | 190 | 28 | 448 |
| 5 | JBL | Harman | 6.1% | 312 | 160 | 165 | 192 | 92 |
| 6 | Fluval | Hagen Group | 4.2% | 232 | 32 | 64 | 57 | 256 |
| 7 | Wardley | Hartz Mountain Corporation | 2.7% | – | – | 210 | 80 | 120 |
| 8 | Aqueon | Central Garden & Pet | 2.7% | 12 | 390 | – | – | – |
| 9 | Ocean Free | Ocean Free | 1.9% | 88 | – | 144 | 48 | – |
| 10 | Omega One | OmegaSea | 1.2% | 20 | 20 | 104 | – | 40 |
| 11 | Tropical | Tropical Group | 1% | 35 | 35 | – | 75 | – |
| 12 | Seachem | Seachem | 0.8% | – | 120 | – | – | – |
| 13 | Taiyo | Taiyo Pet Products | 0.8% | 40 | – | 35 | 43 | – |
| 14 | Nutrafin | Rolf C. Hagen | 0.6% | – | 32 | – | 64 | – |
| 15 | New Life Spectrum | New Life International | 0.6% | – | 80 | – | 12 | – |
| 16 | Alcon | Alcon | 0.5% | – | – | 35 | 43 | – |
| 17 | Sakura | Independent | 0.4% | – | – | – | 63 | – |
| 18 | King British | Beaphar | 0.4% | – | – | 25 | 25 | 12 |
| 19 | Optimum | CP Group / Perfect Companion | 0.4% | 12 | – | – | 36 | 12 |
| 20 | Interpet | Central Garden & Pet | 0.4% | 25 | 25 | – | 8 | – |
Questions about AI fish & aquarium recommendations
- Which fish & aquarium brand does ChatGPT recommend most?
- ChatGPT recommends Tetra most often for fish & aquarium. Across all assistants, Tetra leads with 33.4% of recommendations.
- Which fish & aquarium brand is improving fastest?
- Hikari has the strongest momentum among challengers: AI names it first in 10 of 140 answers where it appears, while holding 19.4% 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.
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