Grey Bamboo Shark

Regularly taken in inshore fisheries off Pakistan, India and Thailand, and utilized for human food. Kept in public aquaria in the United States. Conservation Status : Conservation status uncertain.

An inshore bottom shark, on rocks and in lagoons.Depths 5 to 80 m. Common where it occurs. Oviparous, deposits eggs in small oval egg cases on the bottom. Probably feeds mainly on invertebrates.

Maximum total length at least 77 cm. Freeliving individuals down to at least 12.2 cm, size at hatching uncertain; males maturing between 45 and 55 cm.

Indo-West Pacific: Pakistan, India, Sri Lanka, Malaysia, Thailand; nominal from Indonesia, China, Japan, Philippines, and Papua New Guinea but possibly based in part on Chiloscyllium hasselti.

fieldmarks: Mouth well in front of eyes; spineless dorsal fins far posterior on tail, greatly elongated thick precaudal tail, long and low anal fin just anterior to caudal fin, no lateral ridges on trunk, dorsal fins with straight or convex posterior margins, first dorsal-fin origin about opposite rear halves of pelvic-fin bases; often no colour pattern in adults, but young with transverse dark bands that lack black edging. Prepectoral length 16.5 to 19.5% of total length. Snout rounded anteriorly. Eyes moderately large, lengths 1.3 to 2.2% of total length. Body and tail fairly stout. No lateral ridges on trunk and predorsal and interdorsal ridges not prominent. Interdorsal space fairly short, slightly greater than first dorsal-fin base and 8.7 to 11.5% of total length. Snout to vent length 34.5 to 38.3% of total length; distance from vent to tail tip 58.1 to 64.4% of total length. Dorsal fins fairly large and rounded, subequal to or larger than pelvic fins, and without concave posterior margins and projecting free rear tips. First dorsal-fin origin over rear halves of pelvic-fin bases, first dorsal-fin base slightly longer than second dorsal-fin base, first dorsal-fin height 6.2 to 8.2% of total length. Second dorsal-fin height 7.4 to 9.1% of total length. Origin of anal fin slightly behind free rear tip of second dorsal fin, anal-fin length from origin to free rear tip slightly less than hypural caudal lobe from lower caudal-fin origin to subterminal notch, anal-fin base less than six times anal-fin height. Total vertebral count from 156 to 170 (mean = 161.7, n = 14). Intestinal valve count 15 to 19 (n = 2). Colour pattern absent in adults but young with prominent dark saddle-marks without black edging.

Dorsal spines (total): 0; Dorsal soft rays (total): 0; Analspines: 0; Analsoft rays: 0

Oceanodromous. Migrating within oceans typically between spawning and different feeding areas, as tunas do. Migrations should be cyclical and predictable and cover more than 100 km.

Oviparous, deposits eggs in small, oval eggs cases on the bottom (Ref. 247). Paired eggs are laid. Embryos feed solely on yolk (Ref. 50449). Distinct pairing with embrace (Ref. 205). During copulation observed in captivity, the male bites the female's pectoral fin in a side-to-side position (Ref. 49562, 51121).

Genus: Nostrils subterminal on snout; pre-oral snout long, mouth closer to eyes than snout tip; eyes and supraorbital ridges hardly elevated; no black hood on head or large spot or spots on sides of body above pectoral fins (Ref. 43278). Caudal fin with a pronounced subterminal notch but without a ventral lobe (Ref. 13575). Species: Light brown, yellow-brown or grey-brown above, cream below, with 12-13 prominent saddle marks in young, fading with growth and absent in adults (Ref. 13575). Dark bands in juveniles not outline in black (Ref. 13575). Dorsal fins smaller than pelvic fins, without projecting free rear tips (Ref. 13575). Body without lateral dermal ridge (Ref. 4832,43278, 13575).

A common inshore bottom shark (Ref. 247). Often found in estuaries (Ref. 4832). Probably feeds mainly on invertebrates (Ref. 247, 43278). Oviparous (Ref. 43278, 50449). Utilized as a food fish (Ref. 171).

fisheries: commercial

分布於印度-西太平洋區，自阿拉伯海到印度、斯里蘭卡、新加坡、泰國、越南、印尼、臺灣、菲律賓以及所羅門群島；日本及韓國可能也有分布。臺灣分布於北部、東北部及澎湖海域。

主要以底拖網或延繩釣捕獲。肉質不佳，一般皆以下雜魚處理，或可煙燻食之。

身體及尾部相當粗壯，吻前部圓，體幹側邊無隆脊，背鰭相當大且圓，略小於腹鰭。兩背鰭間距通常超過全長之9.3%。第一背鰭起點超過腹鰭插入點；肛門到尾部尖端距離少於全長之67%。臀鰭起點稍超過第一背鰭的尖端。成魚體色通呈棕色，無斑紋，但幼魚有明顯的黑色橫帶紋。最大體全長至少77公分，成熟雄魚體全長介於45－55公分之間。(陳柔蓉、林沛立2012/11編寫)

主要棲息於沿海礁砂混合且海藻繁生的海床，深度約5－80公尺。行動緩慢。生態習性不甚清楚，可能以底棲無脊椎動物及小魚為食。卵生。

The grey bamboo shark, Chiloscyllium griseum, is a species of carpet shark in the family Hemiscylliidae, found in the Indo-West Pacific Oceans from the Arabian Sea to Pakistan, India, Malaysia, Thailand, Indonesia, China, Japan, the Philippines, and Papua New Guinea, between latitudes 34° N and 10° S, and longitude 60° E and 150° E. Its length is up to 74 cm.

Features: Adults are brown and have no coloration but the juveniles have transverse dark bands.

Reproduction is Oviparous (egg laying).

Classified as Vulnerable (VU) on the IUCN Red List