Larvae Summary

Larvae Information Summary for Hippoglossina oblonga

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Main Ref:

Scotton, L.N., R.E. Smith, N.S. Smith, K.S. Price and D.P. de Sylva 1973

Yolk-sac larvae

	max	min	mod	Ref.
Length at birth (mm)	3.2	2.7
Preanal L. % TL

Place of development
Larval area	Delaware Bay (USA)
Yolk-sac		Ref:
Yolk		Oil globules
Rows on tail	no rows
Other melanophores on tail	more than two dorso-ventral clusters or bands
Vent is halfway between the snout and the tail tip; halfway between the vent and the tip of tail is a diffuse band of melanophores extending onto the dorsal and ventral finfolds.

Post larvae

Striking feature
Striking shape lateral		dorsal
Striking feature
Shape of gut
Gas bladder early		late
Spinal armature early		late
Pigmentation early
Rows on tail	dorsal + ventral + lateral row
Other melanophores on tail	no other melanophores
Melanophores on head + trunk	melanophores on trunk
Rows on tail	dorsal + ventral + lateral row
Other melanophores on tail	no other melanophores
Melanophores on head + trunk	melanophores on head + trunk
Pectorals	normal
Pelvics	normal (i.e. small or absent)
Postanal pigment band is conspicuous and spreads anteriorly and posteriorly at around the time of yolk-sac absorption. At 6 mm, caudal fin ray evident. At 7 mm, dorsal and anal fin rays begin to differentiate. At 9-10 mm, adult complement attained and vertebral counts possible. From this size on, the dorsal fin ray number permits separation of P. oblongus from P. dentatus (D. 80-96). At 10 mm, migration of right eye begins. At 25 mm, the eye is on the dorsal edge of the snout.

	L 1st feeding	Ref.	Months of presence of larvae
max			Jan	Feb	Mar	Apr
min			May	Jun	Jul	Aug
mod			Sep	Oct	Nov	Dec

Water parameters Metric characters

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