چگونه Toli Shad را شناسایی کنیم

برای شناسایی Toli Shad (Tenualosa toli)، به این ویژگی‌های کلیدی توجه کنید.

ویژگی‌های فیزیکی

شکل بدن

compressed

رنگ‌آمیزی

Dorsal surface is typically dark bluish-grey to greenish-grey, fading to bright silvery on the flanks and belly. Fins are generally dusky.

نوع فلس

cycloid

موقعیت دهان

terminal

ویژگی‌های متمایز

Deeply compressed body, Prominent series of 28-30 keeled scutes along the ventral midline from the isthmus to the anus, Absence of a dark spot behind the gill opening (a key differentiator from some similar species), Large, cycloid scales

باله پشتی

Single dorsal fin, typically with 15-17 soft rays, located mid-body.

باله دمی

Deeply forked caudal fin, with two equally sized lobes.

باله سینه‌ای

Relatively small pectoral fins, positioned low on the body.

باله‌های متمایز

Pelvic fins are small, abdominal, and located beneath the dorsal fin origin. Anal fin is relatively long with 17-20 soft rays.

نکات شناسایی

1. 1

   Ventral Scutes

   Count the number of keeled scutes along the belly. Tenualosa toli typically has 28-30 scutes, which is a reliable distinguishing feature.

2. 2

   Absence of Shoulder Spot

   Unlike some other Tenualosa species (e.g., Tenualosa ilisha), T. toli lacks a distinct dark spot behind the gill opening or a series of spots along the flank.

3. 3

   Body Depth

   The body depth is generally 2.8-3.5 times in standard length, making it relatively deep-bodied compared to some other clupeids.

4. 4

   Head Length

   Head length is typically 3.5-4.0 times in standard length.

کاوش در Toli Shad