How to Identify Red Hook Silver Dollar

To identify Red Hook Silver Dollar (Myloplus rubripinnis), look at these key features.

Physical Characteristics

Body shape

compressed

Coloration

The body is typically silvery-grey, often with a metallic sheen. The most striking feature is the anal fin, which is bright red or orange, especially in mature males. Some individuals may exhibit a dark spot or blotch behind the operculum. Juveniles may have a more subdued coloration.

Scale type

cycloid

Mouth position

terminal

Distinctive features

Disc-shaped, laterally compressed body, Bright red or orange anal fin (more pronounced in males), Small, terminal mouth with bicuspid teeth adapted for herbivory, Adipose fin present

Dorsal fin

Single, relatively short-based dorsal fin, typically with 16-18 rays.

Tail fin

Forked caudal fin.

Pectoral fin

Paired pectoral fins, relatively small.

Distinctive fins

Anal fin is elongated and often brightly colored (red/orange), particularly in males. Pelvic fins are small and located abdominally.

Identification Tips

1. 1

   Body Shape

   Look for the characteristic disc-shaped, highly compressed body, similar to a silver dollar coin.

2. 2

   Anal Fin Coloration

   The most reliable identifier is the vibrant red or orange coloration of the anal fin, especially in adult males. This color can vary in intensity but is usually present.

3. 3

   Size

   Adults can reach a considerable size (up to 25-30 cm standard length), distinguishing them from smaller 'silver dollar' species.

4. 4

   Teeth

   While not easily observable in live specimens, their bicuspid teeth are a key taxonomic feature for genus identification.

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