How to Identify Sandy Sprat

To identify Sandy Sprat (Hyperlophus vittatus), look at these key features.

Physical Characteristics

Body shape

elongated

Coloration

Dorsal surface is typically greenish-blue to olive, fading to bright silvery flanks and a white belly. A distinct, often iridescent, silvery-gold lateral stripe runs from the operculum to the caudal peduncle. Fins are hyaline (transparent).

Scale type

cycloid

Mouth position

terminal

Distinctive features

Slender, compressed body, Prominent silvery lateral stripe, Small, terminal mouth, Absence of scales on the head, A series of keeled scutes along the ventral margin

Dorsal fin

Single, short-based dorsal fin located mid-body, typically with 13-16 soft rays.

Tail fin

Deeply forked caudal fin, symmetrical lobes.

Pectoral fin

Small, low-set pectoral fins, typically with 12-14 rays.

Distinctive fins

Pelvic fins are small and located abdominally, anterior to the dorsal fin origin. Anal fin is short-based, positioned well posterior to the dorsal fin, with 15-19 soft rays.

Identification Tips

1. 1

   Body Shape and Size

   Slender, elongated body, typically reaching a maximum standard length of 10-15 cm, though individuals up to 18 cm have been recorded. The body is moderately compressed laterally.

2. 2

   Coloration and Lateral Stripe

   The most distinguishing feature is the prominent, often iridescent, silvery-gold lateral stripe. This stripe is usually more pronounced in live specimens and can fade post-mortem. The overall silvery appearance with a darker dorsal surface is characteristic.

3. 3

   Ventral Scutes

   Feel for a series of sharp, keeled scutes (modified scales) along the belly from the throat to the anus. This is a common feature in clupeids but can help differentiate from other small pelagic fish.

4. 4

   Fin Ray Counts

   Precise fin ray counts (Dorsal: 13-16; Anal: 15-19; Pectoral: 12-14) can be used for definitive identification, especially when differentiating from very similar species.

5. 5

   Mouth Position

   The mouth is small and terminal, not superior (upturned) or inferior (downturned), which is typical for a filter-feeding pelagic species.

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