How to Identify Redhook Myleus

To identify Redhook Myleus (Myleus rubripinnis), look at these key features.

Physical Characteristics

Body shape

compressed

Coloration

Silvery body, often with a faint iridescent sheen. The most distinguishing feature is the bright red to orange coloration on the anal fin, and often on the adipose fin. Some individuals may exhibit a reddish tint on the caudal fin base or operculum. Juveniles may have dark spots or bars that fade with age.

Scale type

cycloid

Mouth position

terminal

Distinctive features

Bright red to orange anal fin, Often red to orange adipose fin, Deep, disc-shaped body, Large, rounded eyes, Small, incisor-like teeth adapted for herbivory

Dorsal fin

Single, relatively tall dorsal fin, typically clear to slightly dusky.

Tail fin

Forked caudal fin, usually clear to slightly dusky, sometimes with a reddish base.

Pectoral fin

Clear, relatively small pectoral fins.

Distinctive fins

The anal fin is notably elongated and brightly colored red to orange, extending along a significant portion of the ventral body. The adipose fin, when present, is also often red or orange.

Identification Tips

1. 1

   Anal Fin Coloration

   The most reliable identifier is the vibrant red to orange anal fin. This color is usually intense and covers most of the fin.

2. 2

   Adipose Fin Coloration

   Presence of a red or orange adipose fin (a small, fleshy fin between the dorsal and caudal fins) further confirms identification, though its intensity can vary.

3. 3

   Body Shape

   Its deep, laterally compressed, disc-like body is characteristic of the Myleus genus.

4. 4

   Dentition

   While difficult to observe without handling, their small, incisor-like teeth are indicative of their herbivorous diet and differentiate them from carnivorous piranhas.

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