How to Identify Tidewater Silverside

To identify Tidewater Silverside (Menidia peninsulae), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

Translucent, pale olive to greenish-yellow dorsally, silvery white ventrally. A distinct, broad silvery stripe extends along the lateral line from the operculum to the caudal fin base.

Scale type

cycloid

Mouth position

terminal

Distinctive features

Prominent silvery lateral stripe, Two dorsal fins, widely separated, Small, terminal mouth, Large eyes

Dorsal fin

Two dorsal fins; the first is spiny (4-7 spines), and the second is soft-rayed (1 spine, 8-10 rays). The first dorsal fin originates posterior to the origin of the anal fin.

Tail fin

Forked caudal fin.

Pectoral fin

Moderately sized, located low on the body.

Distinctive fins

Pelvic fins are abdominal, originating anterior to the first dorsal fin.

Identification Tips

1. 1

   Lateral Stripe

   Observe the distinct, broad silvery stripe running along the sides. This stripe is typically wider and more prominent than in some other silverside species.

2. 2

   Dorsal Fin Origin

   Note the position of the first dorsal fin. In Menidia peninsulae, it originates posterior to the origin of the anal fin. This is a key distinguishing feature from some other Menidia species.

3. 3

   Body Slenderness

   The body is notably slender and elongated, contributing to its 'silverside' appearance.

4. 4

   Scale Count

   For definitive identification, a lateral scale count (typically 38-44) can be used, though this requires careful examination.

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