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Tenualosa toli, commonly known as the Toli Shad, is a commercially important species of ray-finned fish in the family Clupeidae. It is an anadromous species, spending most of its life in marine environments and migrating to freshwater rivers for spawning. Known for its rich flavor and high oil content, it is a prized food fish in many parts of its range. The species exhibits a compressed body, silvery coloration, and a distinct series of scutes along its ventral profile.
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
Ventral Scutes
Count the number of keeled scutes along the belly. Tenualosa toli typically has 28-30 scutes, which is a reliable distinguishing feature.
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.
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.
Head Length
Head length is typically 3.5-4.0 times in standard length.
زیستگاه
- نوع آب
- brackish
- عمق
- Primarily pelagic in coastal marine waters, estuaries, and lower reaches of large rivers during migration. Typically found from surface to depths of about 50 meters.
- محیط
- Coastal marine waters, estuaries, and large freshwater rivers. Prefers turbid waters with moderate to strong currents during spawning migrations.
- پراکندگی جغرافیایی
- Indo-West Pacific region, ranging from the Persian Gulf (Kuwait, Iran) eastward through the coasts of India, Bangladesh, Myanmar, Thailand, Malaysia, Indonesia (Sumatra, Borneo, Java), and potentially extending to the Philippines and southern China.
اطلاعات آکواریوم
- سطح نگهداری: expert
- خلقوخو: peaceful
- رژیم غذایی: filter_feeder
- حداقل اندازه مخزن: Not suitable for home aquaria due to its large size, migratory nature, and specific environmental requirements.
- دما: 24-28°C (75-82°F)
- سطح pH: 7.0-8.0
- سختی آب: 10-20 dGH
- سازگاری: Not applicable for typical aquarium settings. In natural environments, they are schooling fish.
- نیازهای ویژه: Requires large, specialized facilities mimicking estuarine and marine conditions, with access to freshwater for spawning. Not a typical aquarium species.
اطلاعات طبیعی
- وضعیت حفاظتی: vulnerable
- فصلی بودن: Spawning migrations typically occur during monsoon seasons (e.g., May-August in Southeast Asia, September-November in South Asia), making them more available during these periods.
- قیمت بازار: Highly variable, often fetching premium prices, especially during spawning season.
- اهمیت تجاری: high
- طعم: Rich, oily, and distinctive flavor, often described as savory with a hint of sweetness.
- بافت: Flaky and tender, though it contains numerous fine bones.
- روشهای پخت: Steaming, Frying, Grilling, Baking, Curries
- ارزش غذایی: Excellent source of Omega-3 fatty acids, protein, and various vitamins and minerals.
اطلاعات کلیدی
Anadromous Migratorbehavior
The Toli Shad is an anadromous fish, meaning it lives in saltwater and migrates to freshwater rivers to spawn, a critical part of its life cycle.
Culinary Delicacyinteresting
Highly prized for its rich, oily flesh and distinctive flavor, especially during its spawning season when its fat content is highest.
Conservation Concerninteresting
Overfishing, habitat degradation, and damming of rivers have led to significant declines in Toli Shad populations, resulting in its 'Vulnerable' conservation status.
Filter Feederbehavior
Despite its commercial importance, the Toli Shad is a filter feeder, primarily consuming phytoplankton and zooplankton.
اطلاعات ایمنی
بیخطر- سطح ایمنی: safe
- سمی: خیر
- خوراکی بودن: edible
- نکات دستگرفتن: No specific handling precautions are required beyond standard fish handling practices. The scales can be somewhat sharp, so care should be taken to avoid minor cuts. The fish is not venomous or toxic.
گونههای مشابه
Hilsa Shad
Tenualosa ilisha
T. ilisha typically has a distinct dark spot behind the gill opening (sometimes followed by a series of smaller spots), and generally has fewer ventral scutes (29-33, but often overlapping with T. toli). The body depth of T. ilisha is usually greater (2.4-3.0 times in standard length) than T. toli.
Fivespot Sardinella
Sardinella fimbriata
Sardinella species are generally smaller, lack the prominent ventral scutes of Tenualosa, and have a more slender body profile. They also typically have a more pronounced opercular spot.
Chinese Hilsa
Tenualosa reevesii
T. reevesii is generally larger, has a more elongated body, and typically possesses a higher number of ventral scutes (30-36). Its geographic range is also more restricted to the Western Pacific.
طبقهبندی علمی
- سلسله
- Animalia
- شاخه
- Chordata
- رده
- Actinopterygii
- راسته
- Clupeiformes
- خانواده
- Clupeidae
- سرده
- Tenualosa
- گونه
- T. toli
کاوش در Toli Shad
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