Diplectrum bivittatum (Valenciennes 1828)

Diagnosis: Modal fin-ray counts of D-X,12 A-III,7 with 15, and often 16, pectoral-fin rays includes a wide group of serranines including Diplectrum in shallow waters and Serranus atrobranchus, S. maytagi, S. notospilus, and S. phoebe along with Schultzea beta, all in deeper waters. Shallow-water Serranus species with the high pectoral-fin ray count include S. flaviventrus with 16-17 and S. subligarius (only from Florida and GOM) with 15-17. Recruits and juveniles with prominent lateral stripes indicate Diplectrum. The Diplectrum species are separated only slightly by modal pectoral fin-ray counts (and scale counts): 15-16 in D. bivittatum (54-75 lateral-line scales) and 16-17 in D. formosum (46-55). D. formosum occurs in US waters and from Colombia to Brazil. The remaining species in the genus, D. radiale, has a mode of 17 pectoral-fin rays and is found in the S. Caribbean only. D. bivittatum is the only species widespread in the region.

Description: Body thick and relatively narrow with a large round eye and large terminal mouth. Pectoral and pelvic fins medium length, reaching more than half-way to the vent, dorsal-fin base long and anal-fin base short, caudal peduncle relatively narrow and short. Melanophores typically at the angle of the jaw, a cluster on the top of the head, and two stripes of small melanophores, one along the upper body only below the spinous dorsal-fin and one full-length along the lateral midline. There is a row of melanophores along the base of the anal-fin soft rays, one per ray, and several along the ventral midline of the caudal peduncle ending before the start of the procurrent caudal-fin rays. On the fins, melanophores concentrate on the distal membranes between the dorsal-fin spines and extensively speckled along the pectoral and pelvic fin ray membranes. There are often a few melanophores between some of the anal-fin rays. On the caudal fin, there are melanophores at the base of several of the central lower segmented fin rays and a larger patch at the base of the first two or three upper segmented caudal-fin rays that presents as a slight upward curve of the main body mid-lateral stripe. Internal melanophores are present along the dorsal surface of the swim bladder and peritoneum extending to the gut near the vent. Transitional larvae intensify the two stripes and the mid lateral stripe extends forward to the tip of the upper jaw and the upper stripe continues irregularly backwards to the dorsal caudal peduncle. A third short stripe develops on top of the head from the braincase towards the origin of the dorsal fin. Smaller melanophores develop between the anterior portions of the main two stripes and just above the anal fin, as well as in a series of fine patches just below the mid-lateral stripe. The larval melanophores on the pectoral and pelvic fin ray membranes disappear rapidly, those between the dorsal-fin spines disappear last. Melanophores appear on the iris at about 3, 7, 9, and 10 o'clock.

Preopercle with a group of spines. Second ray of upper caudal fin elongated (Ref. 36323).

Simultaneous hermaphrodite. Has a well developed accessory reproductive structure (ARS) which consists of a post-ovarian sinus and numerous well-developed villi which project into the sinus from the sinus wall (Ref. 102260).

Dorsal spines (total): 10; Dorsal soft rays (total): 12; Analspines: 3; Analsoft rays: 7

Found on soft bottom (Ref. 5217). Synchronously hermaphroditic. Good food fish (Ref. 5217).

Diplectrum bivittatum sī Serranidae-kho ê hî-á.

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Diplectrum bivittatum Diplectrum generoko animalia da. Arrainen barruko Serranidae familian sailkatzen da.

侏沙鮨，為輻鰭魚綱鱸形目鱸亞目鮨科的其中一種，分布於西大西洋區，從美國佛羅里達州、百慕達群島至巴西海域，棲息深度可達100公尺，體長可達25公分，為底棲性魚類，屬肉食性，生活習性不明。