Answer:
The author says in paragraph 2 that the baby catfish (which she calls a "kitten-fish") has mother's milk not yet dry upon its lips, when fish don't really drink milk at all because the author is joking about how young the catfish is.
Step-by-step explanation:
The author is making a comparison between the catfish and the way mammals nurture to state the point that the little fish is so young that can not be considered as a real fish in terms of fishing or what you can do with that animal, this fish needs to grow, its stage in development is so low as the little newborn mammals.