Fish (4)

Around Christmas each year the British spy agency puts out a puzzle intended to challenge the best solvers in the world. This is a relatively easy puzzle from 2016 involving fish.

The first step in solving this puzzle requires identification of each fish species represented by the pictures. From top to bottom and left to right:

Cat
Lemon
Rainbow
Sword

Saw
Zebra
Pineapple
Beard

Glowlight danio
Madusa
Bone
Angel

Fire
Dog
Clown
Monk

Next, notice the number of bubbles vary by each fish. If we take the letter from each fish name corresponding to the number of bubbles, another fish type is spelled out. For example, Cat has 3 bubbles so pick the third letter C. Doing so for each tank, we get:

Toad
Sand
Lung
Rock

To this point the tank numbers 1 through 4 have not been used. Let's pick the letter corresponding to the tank number. Doing so reveals the puzzle's answer T.... or FISH ....

Feel free to contact me to check your answer or with questions.