Larvae Summary

Larvae Information Summary for Trinectes maculatus

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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)	1.9	1.7
Preanal L. % TL

Place of development	planktonic
Larval area	Delaware Bay
Yolk-sac		Ref:
Yolk		Oil globules	more than one oil globule
Rows on tail
Other melanophores on tail

Post larvae

Striking feature	other
Striking shape lateral	normal (not striking)	dorsal
Striking feature	other
Shape of gut	elongated
Gas bladder early		late
Spinal armature early		late
Pigmentation early
Rows on tail	no rows
Other melanophores on tail	no other melanophores
Melanophores on head + trunk	melanophores on trunk
Pigmentation late
Rows on tail	no rows
Other melanophores on tail	tail partly covered with melanophores
Melanophores on head + trunk	melanophores on head + trunk
Urostyle region early	unpigmented	late	unpigmented
Peritoneum	without melanophores
Pectorals	normal
Pelvics	normal (i.e. small or absent)
At 2.2-2.4 mm, yolk-sac nearly absorbed; pigmentation concentrated on fin folds; a "bump" on head; vent is separated from rudimentary stomach. Pectoral fins are present and remain in larvae until metamorphosis but no traces are found in adults. After 3 mm, the larvae become deep bodied and pigment now scattered all over the body. At 3.8 mm, rays developed in vertical fins; eyes still symmetrical; a depression forms over right eye. At about 5-6 mm SL (34 days old), left eye beginning to migrate. At 18 mm, both eyes on right side; pigments on eyed side. At 25-30 mm, pectoral rudiment lost.

	L 1st feeding	Ref.	Months of presence of larvae Ref.
max	2.4	39467	Jan	Feb	Mar	Apr
min	2.2	39467	May	Jun	Jul	Aug
mod			Sep	Oct	Nov	Dec

Water parameters Metric characters

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