Though I learned a lot about cod, I was not always a fan of the author's tone, as it bordered on "preachy" several times (mostly in reference to the evil humans). Yes, we do need to be stewards, good stewards of the natural world around us. No, this should not mean that we stop using the resources we have, we simply need to use them better and try to replenish them whenever possible. (While the author goes into detail on the dangers of extinction and slightly mentions laws that have been passed to protect the cod, he does not put forth any effort to suggest any way to fix the problem, or what people are already doing to fix the problems mentioned. One sided arguments always annoy me.)
Anyway! If you need a fishy book, you could do worse; you could probably also do better.
No overt content issues; already mentioned my main quibble.