Bacterial chitinase enzymes help scale-eating catfish digest their food

[bekateen]

Gosavi, S.M., Kharat, S.S., Kumkar, P., & Navarange, S.S. 2017. Interplay between behavior, morphology and
physiology supports lepidophagy in the catfish Pachypterus khavalchor (Siluriformes: Horabagridae).
Zoology. Available online 12 July 2017. http://dx.doi.org/10.1016/j.zool.2017.07.003

http://www.sciencedirect.com/science/ar ... 0617300156

ABSTRACT
The present study demonstrates the scale-eating behavior of a siluroid catfish,

Pachypterus khavalchor

, and the role of its oral structure and bacterial endosymbionts in shaping this lepidophagous habit. Scale-eating behavior in P. khavalchor was studied using a series of behavioral experiments. P. khavalchor was found to feed only on the scales of live fish and never of dead fish, even after 72 h of starvation. It was nocturnal in habit and attacked all species that were used as prey. Attacking behavior showed extensive chasing of prey species followed by a powerful random strike at the flank or close to the caudal region in posterior oblique position. After a strike, P. khavalchor was found to immediately turn back and pick up the falling dislodged scales. SEM analysis of oral structures of P. khavalchor revealed three different types of teeth arranged in specific order on the upper jaw, lower jaw and pharyngeal region that could facilitate their lepidophagous habit. Teeth of upper and lower jaws are likely to help in dislodging the scales and pharyngeal teeth may help to engulf the scales. Gut microflora analysis and enzyme assay revealed two isolates, namely Bacillus pumilus and Bacillus licheniformis, which were positive for chitinase production. These two isolates were found to be capable of producing chitinase indicating that they are likely to be involved in the digestion of chitin-rich scales in the host fish gut. An in vitro scale degradation assay further strengthens the results since both isolates were found to be efficient in chitinase production and degradation of scales.

• KEYWORDS: Scale-eating behavior; Bacterial endosymbionts; Gut microflora; Chitinase;
  Oral morphology

HIGHLIGHTS:

• The scale-eating behavior of Pachypterus khavalchor was investigated.
• Oral morphology supported lepidophagy in Pachypterus khavalchor.
• Hunting strategy and attack behavior helped in dislodging scales of prey fish.
• Chitinase-producing bacterial endosymbionts were isolated from the host gut, supporting their role in scale digestion.
• The interplay between oral structures, attack behavior and bacterial endosymbionts in scale digestion is discussed.

Personal comment: I did not know that some fish's scales contain chitin! I thought they were just bony. Who would have imagined!