Fish ID sonar image

[prolog22]

Started fishing with dragonfly sonar recently and have a question to those who have been using sonars for longer time.
A few days ago on the way to mp rig at 25 ft depth right in the middle of water column noticed a fish on a screen taking about 3/4 of a screen width with pretty clear image of body (head, fins and a tail). At that depth (about 12 feet fish depth) what size could it be? My first impression was that it was a massive shark passing by. Could a dolphin make an image this big?

[Tombo]

Sounds kind of creepy to me. Sometimes its better not to know what lurks beneath us.
All we can do is guess. Its not uncommon for larger fish/mammals of the size you describe. If I had to guess, not a dolphin as you did not mention spotting any at the surface. Conditions were very smooth last weekend so it would be easy to see any surface activity.

[TigerLandSportsman]

My guess would be a shark

[prolog22]

Did some math. Based on a spec, the sonar makes an image out of 70 deg view angle.
At 12 ft depth this angle should make a conversion to about 13 ft length of the object. Because it showed up 3/4 of a screen width, this animal was about 9-10 ft long. Shark most likely..

[WoodsWaterSky]

I'd be willing to bet it was a shark too.

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[prolog22]

Sounds kind of creepy to me. Sometimes its better not to know what lurks beneath us.

I don't mind taking ride on sharks, but It looked creepy, I was there solo on Monday.. Did not see nobody around rigs all day long..