Figures 2–9; Adult specimens (2, 3) and their teeth (4, 5) and gross morphologies (6, 7) and histological sections (8, 9) of the gonads of tropical anguillid eels, Anguilla marmorata, that were collected in Brunei Darussalam, Borneo Island: (2) BE-1, A. marmorata (962 mm in TL); (3) BE-2, A. marmorata (1352 mm in TL); (4) Narrow maxillary bands of teeth of BE-1; (5) Narrow maxillary bands of teeth of BE-2. The gonadal histology of Stage III (8; BE-1) showed oocytes with oil droplets mid-vitellogenic oocytes in the early maturation stage. The gonadal histology of Stage V (9; BE-2) showed mid-vitellogenic oocytes (arrows) in the final preparation for spawning. Gross morphologies of the gonads (6, 7) are indicated by arrows. Scale bars: 8, 9 = 50 µm.
Figure 2; Anguilla marmorata and A. bengalensis bengalensis collected in the Pondok Upeh River in Penang Island of Peninsular Malaysia. A Anguilla marmorata (904 mm in TL) B Anguilla bengalensis bengalensis (889 mm in TL) C Wide maxillary bands of teeth of A. marmorata D Narrow maxillary bands of teeth of A. bengalensis bengalensis. DNA was extracted from dorsal fin clip of each specimen, and hence the posterior dorsal fin of each specimen is lacking.