"Stop casting into the middle of the pond": a fishing tip video with 5.2M views that pushed a fish-ID app to #10 on the Sports chart

Catcharium is a photo-based fish identification and catch-logging app, and the fish you catch swim into your own animated aquarium. It has no paid ads. Instead it built a same-name account posting fishing tips: the TikTok account, started 5 weeks ago, has racked up about 13.4M views, and the app gained nearly 7 in 6,000 days on Google Play, charting in the free Sports category in 10 countries including the US, Australia, and the Philippines. Below: what it is, where the traffic came from, where the money comes from, who else is competing with it, and whether this playbook can be run again in another category.

An account only 5 days old

On 2026 Oct 4, the TikTok account @catcharium posted a video under two minutes, opening with "Stop casting into the middle of the pond". The reasoning is straightforward: the middle of the pond has no cover, fish sit in the deep water in summer with low oxygen, and they hug the edges, right at your feet, the bank the wind pushes onto, inlets, under branches, and in shade. The last line: "Stop casting in the middle, cast to the edges."

The account had only posted its first video in Sep 29. By Nov 6, this video had 5.21M views and 390k likes. The top comment (16k likes) reads "no man skipped this video"; another comment with 1,871 likes says: "Seriously, someone make a game out of this."

They already did. The account bio reads: "Identify fish. Log catches. Build your aquarium. Tap App to download".

What it is

Snap a photo of a fish (or pick one from your camera roll), the AI gives a species, saves it to your catch log with date, length, weight, and spot. The difference comes next: saved fish swim into your animated aquarium, you light up a 485-species dex, earn badges, and can generate share cards. The Instagram bio is more direct: "Catch them all", with your Fish Dex. In short, it turns fishing into a real-world Pokémon-style collection.

The iOS version launched in Sep 21 under developer Fria LLC; the same account also runs a string of AI utilities (calories, sleep, step counting), each with near-zero ratings. The Google Play version launched in Oct 14 under Llama AI LTD, with a common registered-agent address in London. I couldn't determine the relationship between the two companies or where the team is based.

How big it is now

In short: traffic is still small but growing, and growing in step with the videos. Revenue is basically invisible.

Where the traffic comes from: a genuinely useful fishing science account

As of 11-06, TikTok @catcharium has 57k followers, 900k likes, and 32 videos, almost one a day, each 1 to 2.5 minutes long. Every one covers something beginner anglers really want to know, not an app pitch:

• "Same pond, same spot, same worms, he caught ten, you caught none"—five beginner mistakes, 390k views (10-18)
• "You've been casting right over the fish's head"—the deep trough behind the first wave at the beach, 1.09M views (10-10)
• "Doctors remove hooks from people with fishing line"—270k views (10-24)
• "This lure has no hook, and squid still won't let go"—Japanese wooden shrimp, 340k views (10-25)
• "The only fish people tell you not to release"—northern snakehead, 160k views (11-03)

The videos carry no ad label and no AI-generated tag. The same-name YouTube channel has 24k subscribers and posts 10 to 15-minute long-form videos: "How to Find Fish in Freshwater" 168k views, "Saltwater" 125k, "Every Fishing Rig Explained" 16k (posted 5 days ago). The channel's only link is catcharium.app/download. Instagram has 74k followers. They also run a Japanese account, @catcharium_jp.

These accounts do drive people into the app, and there are three pieces of evidence:

• Users said it themselves. A five-star App Store review of 10-25 reads: "I first found it from the YouTube channel (which is actually a good channel)"; on Google Play someone wrote "I also love the youtube content keep it up".
• Viewers spotted it. Under the 10-30 video that got 2.46M views, one commenter wrote "bro ngl thats a great ad. didnt even know it was one"; another came in to complain about the app: "your app says the 13 lb bass in my video is a giant grouper."
• The timing lines up. After the 10-30 video went up, Play daily installs rose from about 677 to about 1,117 (11-01), and US sports chart rank went from #160 to #124 (10-31 → 11-02). The 10-04 video that hit 5.2M was the same week iOS reviews started coming in heavily.

I checked the Google and Meta ad libraries and found no paid ads (not finding them doesn't prove none were run, but there's no sign of any). On X there was zero discussion in the past 90 days, no media coverage, and on Reddit only a small r/FishingForBeginners thread titled "Catcharium is underrated".

Why users stay

Fish identification and catch logs aren't new. What got video viewers to install, keep the app, and leave good reviews is the collecting:

• "I used to only fish for bass and bluegill. With this app I want to catch every kind of fish. I love fishing and I keep a fish tank, and it puts both together." (App Store, 11-01)
• "I'd been thinking about making this app for months and you guys made it first... I bought lifetime Pro right away." (App Store, 10-08)
• On Google Play, one person said it's "appealing to young people... almost like a game."

The weaknesses are clear too: identification accuracy. Most negative reviews are about this: "most fish misidentified", "AI flipped the fish photo and the cutout looks ugly". The team moves fast: on iOS they shipped 7 versions in 7 weeks, adding manual species correction, tiny fish, and weight logging based on reviews. Ratings have climbed with each version; on Play, v1.0.2 was 4.59 and v1.0.3 is 4.68.

Where the money comes from

The free version identifies fish, keeps logs, and shows basic info on fish you've caught. Pro unlocks the full encyclopedia, search by name, fishing tips, and HD photos. Payment is monthly, yearly, or a one-time lifetime purchase; on Play the in-app price is $9.99–69.99. Early on the free tier only let you log 3 fish; someone gave a one-star review saying "not worth downloading", and they loosened the limit later.

The one-time purchase matters: users specifically praised it in reviews, saying "you can pay once, not monthly or yearly." But judging by the grossing charts, it earns very little right now (estimate: at most a few thousand dollars a month, unverified). This business is currently building a user base, not collecting money.

Who it's competing with

They're all tools. I didn't find a second fishing app launched in the past 2026 years across both stores that fills an aquarium and encyclopedia with real fish, and I didn't see copycats. On Steam there's a fishing collection game with the same name, "Catcharium" (developer bindev, unreleased); I couldn't verify whether it's the same team as this app.

If it were you

My take: worth following. Copy the playbook: "launch a science channel first, then the app," plus "identification + encyclopedia collecting". But apply it to a different category instead of building another fishing app.

Who it's for: a team of 1–3 people. One person can build the photo-recognition app with a field guide and animated display (calling an off-the-shelf multimodal model is enough for the recognition), and one person can write and make a 1–2 minute science short every day. Ideally, that person is a hobbyist in this niche themselves.

Who it doesn't suit: anyone who doesn't want to make content and would rather just buy ads or wait for organic store traffic (almost all of its traffic comes from video); anyone who wants to build a "more accurate ID" tool to compete with iNaturalist or Google Lens; anyone expecting to make real money from subscriptions within six months, since its revenue isn't visible yet.

How to do it:

• Categories to try: bird watching, insects, mushrooms, rocks and minerals, shells, wildflowers, tide pools. All of these are hobbies built on "you run into something outdoors → want to know what it is → want to collect them all." Pick one you play yourself.
• Languages: besides the English main account, it only has one Japanese account, and I didn't see others (I didn't check systematically). Fishing is a mainstream hobby in Brazil, Mexico, and Southeast Asia, and the app charts higher in the Philippines, Malaysia, and Mexico than in the US.
• On product: make the home screen your collection (aquarium, specimen cabinet, bird aviary), and give each catch a bit of ceremony. Let users fix a wrong ID with one tap, so one misidentification doesn't ruin the collecting. For pricing, follow its model: basic features free, full encyclopedia and tips paid, and definitely offer a lifetime one-time purchase tier.

How to get users: do what it does. Start the account two to three weeks before launch and post one video a day about the thing beginners most want to know in this hobby, ideally something counterintuitive ("why you can't catch fish", "don't touch this"). The opening line has to stop people scrolling. Put the download link in the bio and a pinned comment, and don't mention the app in the videos. Also post 10-minute long-form compilations on YouTube to build up searchable long-tail traffic. When a video passes 1M, make three more videos on that topic from different angles. It went from account launch to its first 5M in just 5 days, but don't treat that as typical; usually you need dozens of videos to get one hit (estimate).

Timing: it's not widely known yet. No press, no one posting revenue, and no copycats. Switching categories carries almost no window pressure. If you go after fishing in another language, you should move before it builds language accounts beyond Japanese; within six months is reasonably safe.

What would mean you read it wrong:

• Catcharium's Play weekly installs fell back to a few hundred by late November, and its TikTok hasn't had a single video pass 500K for a month. That suggests this playbook only worked for a few hits and can't sustain itself;
• As of early 2027, it still hasn't charted in any country's sports grossing list. That suggests beginner anglers will install but won't pay, and the collecting mechanic drives retention, not conversion;
• If you've posted for a month and 30 videos without one hitting 100K views, it means your category doesn't respond to science short videos or your topics aren't counterintuitive enough. Change the topics and try again rather than pushing on.

---

Data and sources: Google Play store page and charts (10-29 to 11-06); App Store US page, charts, and reviews (10-04 to 11-06); TikTok @catcharium videos, captions, and comments (checked 11-06); YouTube @catcharium channel page, Instagram @catcharium.app (11-06). Daily Play installs are AppstoreSpy estimates. Anywhere marked "estimate", "inferred", or "unverified" is inference or estimation.