KDP categories · Top KDP authors
Marine Life (Fish & Marine Life, Kindle eBooks): Amazon KDP category data
Amazon Kindle eBooks Best Sellers data for Marine Life (Fish & Marine Life, Kindle eBooks), updated Nov 2, 2026: median price $3.99, median 300 reviews, average rating 4.6 and a KDPTop opportunity score of 18/100 (highly competitive).
| Price range (middle 50%) | $2.99 – $5.99 |
|---|---|
| Average rating | 4.6 |
| New releases (90 days) | 6% |
| Books on the list | 100 |
| Store | Kindle eBooks |
What stands out
- At $3.99 its median price is below 97% of Kindle eBooks categories, so it is a volume game.
- Its review barrier is higher than in 74% of Kindle eBooks categories: the median best seller has 300 reviews, so new books need time to build up.
Top 10 Marine Life best sellers
-
SpongeBob Goes to the Doctor (SpongeBob SquarePants)
- List rank#1
- Price$3.99
- Rating4.2
- Reviews3,276
-
Behold, No Cavities! A Visit to the Dentist (SpongeBob SquarePants)
- List rank#2
- Price-
- Rating4.2
- Reviews143
-
Clark the Shark: Too Many Treats: A Funny Self-Control Story About Temptation for Children (Ages 4–8) (I Can Read Level 1)
by Bruce Hale
- List rank#3
- Price$4.99
- Rating4.7
- Reviews4,841
-
Sharks (National Geographic Kids Readers, Level 2)
- List rank#4
- Price$2.99
- Rating4.8
- Reviews2,828
-
Chompy the Shark: Short Stories and Jokes for Kids Ages 4-8 (Early Bird Reader Book 3)
- List rank#5
- Price$0.99
- Rating4.0
- Reviews1,111
-
Adventures With An Axolotl! Inspiring Short Stories For Kids 6-10: 15 Fun & Imaginative Short Stories Teaching Key Life Lessons While Encouraging Fun, ... (Kids adventure and education books Book 1)
by Maxwell Vox
- List rank#6
- Price$0.99
- Rating4.2
- Reviews58
-
5 Steps to Drawing Sea Creatures
by Amanda StJohn
- List rank#7
- Price$17.07
- Rating3.0
- Reviews1
-
Weird Sea Creatures (National Geographic Kids Readers, Level 2)
by Laura Marsh
- List rank#8
- Price$4.99
- Rating4.8
- Reviews1,941
-
The Pout-Pout Fish (A Pout-Pout Fish Adventure Book 1)
- List rank#9
- Price-
- Rating4.8
- Reviews28,040
-
UFO! (SpongeBob SquarePants)
- List rank#10
- Price$3.99
- Rating4.3
- Reviews263
FAQ
Is Marine Life a good niche for Amazon KDP?
Its KDPTop opportunity score is 18/100, which makes it highly competitive. The median best seller has 300 reviews and sells for $3.99.
How many reviews do you need to rank in Marine Life?
The median best seller has 300 reviews, and 37% of them have fewer than 100.
What do Marine Life best sellers cost?
The median price is $3.99; half of the best sellers are priced between $2.99 and $5.99.
Can new books break into Marine Life?
6% of the current best sellers were released in the last 90 days.
About this data
Data comes from KDPTop's daily crawl of Amazon's public Best Sellers pages; medians use the latest list. The opportunity score (0–100, higher is easier to enter) combines the review barrier, the share of low-review books, list turnover, new-release share and price.