KDP categories · Top KDP authors
Ichthyology (Zoology, Kindle eBooks): Amazon KDP category data
Amazon Kindle eBooks Best Sellers data for Ichthyology (Zoology, Kindle eBooks), updated Nov 2, 2026: median price $7.89, median 22 reviews, average rating 4.5 and a KDPTop opportunity score of 19/100 (highly competitive).
| Price range (middle 50%) | $4.99 – $14.20 |
|---|---|
| Average rating | 4.5 |
| New releases (90 days) | 11% |
| Books on the list | 100 |
| Store | Kindle eBooks |
What stands out
- Its median reviews are 8% of the parent category Zoology (271), one of the easier corners under it.
- The same niche in Books scores 30, 11 points higher than here; worth checking both.
- Its review barrier is lower than in 70% of Kindle eBooks categories: the median best seller has only 22 reviews, so new books can chart with few.
Top 10 Ichthyology best sellers
-
Scientific American September 2026
- List rank#1
- Price$6.99
- Rating4.8
- Reviews13
-
Scientific American October 2026
- List rank#2
- Price$6.99
- Rating4.2
- Reviews7
-
Scientific American November 2026
- List rank#3
- Price$6.99
- Reviews-
-
What a Fish Knows: The Inner Lives of Our Underwater Cousins
by Jonathan Balcombe
- List rank#4
- Price$11.99
- Rating4.6
- Reviews868
-
Scientific American May 2026
- List rank#5
- Price$6.99
- Rating4.0
- Reviews1
-
The Shark Handbook: Third Edition: The Essential Guide for Understanding the Sharks of the World (Shark Week Author, Ocean Biology Books, Great White Shark, ... and Nature Books, Gifts for Shark Fans)
by Greg Skomal
- List rank#6
- Price$7.99
- Rating4.8
- Reviews256
-
The Book of Eels: Our Enduring Fascination with the Most Mysterious Creature in the Natural World — A Natural History
by Patrik Svensson
- List rank#7
- Price$9.99
- Rating4.5
- Reviews1,396
-
The New Saltwater Aquarium Guide: How to Care for and Keep Marine Fish and Corals (Reef Aquarium Book Series 1)
by Albert B. Ulrich III
- List rank#8
- Price$7.95
- Rating4.4
- Reviews248
-
The Betta Bible: The Art and Science of Keeping Bettas
by Martin Brammah
- List rank#9
- Price$9.99
- Rating4.6
- Reviews358
-
Shark: The Illustrated Biography
by Daniel C. Abel
- List rank#10
- Price$16.17
- Rating4.7
- Reviews39
Same niche in Books: Ichthyology
FAQ
Is Ichthyology a good niche for Amazon KDP?
Its KDPTop opportunity score is 19/100, which makes it highly competitive. The median best seller has 22 reviews and sells for $7.89.
How many reviews do you need to rank in Ichthyology?
The median best seller has 22 reviews, and 80% of them have fewer than 100.
What do Ichthyology best sellers cost?
The median price is $7.89; half of the best sellers are priced between $4.99 and $14.20.
Can new books break into Ichthyology?
11% 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.