About sexual dimorphism in this species, I found that my two former specimens were male's and my new one is a decidedly a female based upon comparative morphometrics and the absence of genital papillae. I initially guessed that the new fish was female just due to it's basic profile compared to past specimens. Also different is colouration and markings to a less degree as can be seen in the following photos:
The newest one-nocturnal colouration
Interesting is that the original two were almost strictly piscivorous and the new one will feed on a wide variety of frozen bloodworms and brine shrimp plus a variety of pellets and likes live nightcrawler worms.
I'm not sure if the sexual differences may apply to other batrochoglanis species such a b. raninus for example, the only other of the genus usually imported.
Having kept the latest one for only one year, 3 months, I already assumed it was close to being an adult as it arrived as being 9" long TL. Since then it is now 9 3/4" TL., so I assume any further growth will be slow and minimal, time will tell. I still have questions as to whether or not my three examples are the exact same species or are more likely, just individual differences or regional adaptations within Peru. In any case, they are so very close to examples I've seen in photos of these fish found in other countries, so I'm inclined to think the species is probably valid until future studies may determine otherwise...
