This is a fascinating book for anyone interested in fish, whether you've kept them as pets, eaten them or wondered at them swimming in our waterways. It's full of interesting science, which is complemented by anecodotes, which, the author notes "carry little credibility with scientists, but ... provide insights into what animals may be capable of that science has yet to explore and they can inspire deeper reflection on the human-animal relationship". This mix of science of anecdote worked really well for me, and gave a more well-rounded overview than would have been possible relying purely on science, vital though that is.
We're told about the evolution and ecology of fish, taken through how they perceive the world and given insights into their social lives from how they travel in groups to their parenting styles. I learned a lot about fish that I hadn't previously known, including how they can use the reflections on the water surface to see things out of their direct line of sight and that they can produce an 'alarm chemical' to alert other fish to danger, they can even use tools and engage in social play.
My favourite part of the book was the in-depth exploration of the complex relationships between cleaner fish and their clients. Cleaner fish hang around reefs waiting for larger fish (and other animals) to come by and then pick off the mites and other parasites from the larger animals' bodies.
The author takes a strong moral position on the value of fish as thinking, sentient beings, opposing industrial fishing operations and sport fishing alike. I was very impressed too by how he also outlines his ethical misgivings about some of the scientific experiments he cites to back up his arguments.
This is an excellent, engrossing read.
What a Fish Knows by Jonathan Balcombe, published (2016) by OneWorld Publications.
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I posted a new piece on my Crafty Green Poet Substack today, you can read it here.
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