SPATIAL AND SEASONAL PATTERNS IN SPECIES COMPOSITION AND OCCURRENCE OF FISH LARVAE IN THE AREA OF THE CANARY ISLANDS, EASTERN CENTRAL ATLANTIC
preanal length of about 60 % of BL. The flexion takes place at around 3.5 mm and the dorsal and anal fin rays are completed at a size of 4.5 mm. Sub-, pre-, and opercle spination is developed. All fins have a low count and between the dorsal fins a large interspace is present. The pectoral fins are elongated and may reach to the origin of the anal fin. The caudal peduncle is long and the caudal fin is forked.
-- Reference: JOHNSON (1984b); NELSON (2006); RICHARDS and LARA (2006);
• Howella brodiei Meristics: Vertebrae:
24 – 26
Dorsal spines + rays:
VII – VIII + I + 8 – 10
Anal spines + rays:
III + 7 – 8
Pelvic spine + rays:
14 – 16
-- Morphology: Four opercular spines are present. Sub- and preopercle end in each one large spine. The second dorsal fin and the anal fin are positioned in the posterior part of the body in an opposite position. Originally the pectoral fin is elongate and reaches beyond the anal fin origin, but all elongate pectoral fin rays broke off (Figure 57).
-- Pigmentation: The little stellate melanophores distribute all over the body, but concentrate at the origin of the caudal peduncle. This is a prominent character for that genus and very distinct (Figure 57). Together with the meristic counts, species identification is possible. Further, the dorsal surface of the gut is strongly pigmented. Spots form at the tip of the snout.
-- Reference: RICHARDS and LARA (2006);
-- Reference material: 4 specimens; 11/97: S4 (P43725-726); S10 (P43723-724);
-- Distribution: Specimens were only present at neritic stations in autumn, so southeast of Fuerteventura at a depth of 22 – 35 m at daytime and northeast of Lanzarote at 20 – 64 m depth during the night.
Serranidae The family consists of four distinguishable morphological subfamilies. But all larvae hatch at 1.2 – 2.3 mm with a large yolk sac, unpigmented eyes and underdeveloped mouth. The gut is straight and reaches to or beyond the midbody level, but coils and shortens during preflexion stage. The shape of the body and head are variable from slender to deep and from broad to laterally compressed.The anal, pectoral and pelvic fins form early. If there are any elongate spines, then mostly the third dorsal or the pelvic spines are modified, but more spines can be elongate and modified as well. The pectoral fins may be enlarged and pigmented. The pigmentation is very variable, but in most larvae light to moderate. But melanophores are present and
Inf. Téc. Inst. Canario Cienc. Mar. n°13
Published on Mar 26, 2013
Published on Mar 26, 2013
Technical report consisting on a comprehensive annotated larvae taxa list with the most important taxonomic characters of this region