This is a most attractively marked species whose jet-black body contrasts sharply with a white streak that runs from the snout to the top of the head, and two white patches in the caudal peduncular area. The somewhat less strikingly marked A. leptorhynchus (Long-nosed Black Ghost Knifefish)—which is smaller (around 10in/25cm)—is also available.
This varied selection of popular American species demonstrates the amazing adaptability of fish. For example, the Amazon Puffer, whose relatives are confined to marine and brackish waters, has changed its body chemistry to enable it to exploit salt-free environments.
If you have read through the catfishes chapter you will already be aware of Malapterurus electricus (Electric catfish). There are, however, several other fishes that are able to produce electricity.