Larvae Summary

Larvae Information Summary for Thunnus alalunga

( not available )

Main Ref:

Bertolini, F., U. D'Ancona, E. Padoa Montalenti, S. Ranzi, L. Sanzo, A. Sparta, E. Tortonese and M. Vialli 1956

Yolk-sac larvae

	max	min	mod	Ref.
Length at birth (mm)			2.5
Preanal L. % TL			48

Place of development	planktonic
Larval area	Northwestern Pacific (Japan); eastern central Atlantic
Yolk-sac	ovoid pigmented	Ref:
Yolk		Oil globules	one oil globuleposteriorcentralpigmented
Rows on tail	dorsal + ventral row
Other melanophores on tail	tail with single melanophore
Melanophores on head + trunk	melanophores on head + trunk
Only a few dorsal postanal chromatophores.

Post larvae

Striking feature	teeth clearly visible
Striking shape lateral	normal (not striking)	dorsal	normal (not striking)
Striking feature	teeth clearly visible
Shape of gut	triangular
Gas bladder early		late
Spinal armature early	several different spines	late	several different spines
Pigmentation early
Rows on tail	no rows
Other melanophores on tail	no other melanophores
Melanophores on head + trunk	melanophores on head + trunk
Pigmentation late
Rows on tail	no rows
Other melanophores on tail	no other melanophores
Melanophores on head + trunk	melanophores on head + trunk
Urostyle region early	unpigmented	late	unpigmented
Peritoneum	covered with melanophores
Pectorals	normal
Pelvics	normal (i.e. small or absent)
Presence of several preopercular spines in two rows during the early stage and later, these preopercular spines have the posterior ones longer.

Meristic characters

	max	min	mod	Ref.
Total number of vertebrae	40	39	39
Preanal number of vertebrae	19	18	18

	L 1st feeding	Ref.	Months of presence of larvae Ref.
max	3.6		Jan	Feb	Mar	Apr
min	3.2		May	Jun	Jul	Aug
mod	3.4		Sep	Oct	Nov	Dec

Water parameters Metric characters

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