Page 153 - 《水产学报》2026年第2期

2 期 水 产 学 报 50 卷

Pt
F
S
C1

Sf

0.25 mm 1 0.50 mm Cf 2

uPt

S

Pt

Fr
Sc
Pr

Dr
Co 3 3.00 mm 4
3.00 mm

Plate Ⅳ Development of the pectoral fin skeleton
(1) 3.78 mm NL; (2) 12.89 mm SL; (3) 31.07 mm SL; (4) 34.56 mm SL. Ap. anterior process; Cf. coracoid foramen; Cl. cleithrum; Co. coracoid; Cs.
coracoscapular cartilage; F. fin-fold; Fp. fin plate; Pp. posterior process; Pr. propterygium; Pt. posttemporal; R. ray; S. supracleithrum; Sf. scapula fora-
men; uPt. upper posttemporal.

was associated with the first fin ray (Plate Ⅳ-3-4). The (Plate Ⅴ-3). The ossification of the basipterygium
coracoid and the scapula had ossified by 31.07 mm began at the mid-portions in 31.07 mm SL (Plate Ⅴ-4).
SL. The posttemporal upper and lower processes were The anteriormost tip margins remained as cartilage. By
fully formed in 34.46 mm SL (Plate Ⅳ-4). No post- 34.56 mm SL (Plate Ⅴ-5-6), the basipterygium and
cleithrum was present. pelvic scute were fully ossified. The metapterygium
remained cartilaginous.
2.5 Pelvic fin development
2.6 Development of the vertebral column
Initially, a blue colouration appeared at the vent-
ral abdomen, just at the beginning of the intestines, in No neural or haemal arches and spines were
11.91 mm and 12.89 mm SL (Plate Ⅴ-1). By 14.73 observed along the notochord in specimens smaller
mm to 15.06 mm SL, the right and left basipterygium than 5.55 mm NL. Haemal arches were the first ele-
developed into small, rod-like cartilage structures (a ments to develop at the posterior end of the notochord
symmetrical pair of pelvic plates): their posterior at 5.55 mm NL (Plate Ⅰ-1). The first neural arch
heads expanded and enlarged (Plate Ⅴ-2). Anteriorly, appeared later, at 7.38 mm NL. Fifteen neural arches
the basipterygial arms were elongated. Around 18.08 and spines and 18 haemal arches and spines were
mm SL, the outermost radial cartilages (metaptery- present as cartilage by 10.24 mm SL. Ossification of
gium) became apparent, and fin rays began to ossify the vertebrae started at the caudal end, then the

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