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Larval development of five species of blenny(Teleostei: Blenniidae) from the western central North Atlantic, with a synopsis of blennioid family characters.

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Title: Larval development of five species of blenny(Teleostei: Blenniidae) from the western central North Atlantic, with a synopsis of blennioid family characters.
Authors: Ditty, J. G.1 jim.ditty@noaa.gov, Shaw, R. F.2, Fuiman, L. A.3
Source: Journal of Fish Biology. May2005, Vol. 66 Issue 5, p1261-1284. 24p.
Subjects: Blenniidae, Perciformes, Fishes
Geographic Terms: Gulf of Mexico, Louisiana
Abstract: Light trap collections on oil and gas platforms in the northern Gulf of Mexico off Louisiana from 1995 to 1997 contained young of tessellated blennyHypsoblennius invemar, freckled blennyHypsoblennius ionthas, featherduster blennyHypleurochilus multifilis, molly millerScartella cristataand seaweed blennyParablennius marmoreus, which are described. Interspecific differences were: number of dorsal, anal, pelvic and caudal fin elements; number of mandibular pores; presence or absence of canine teeth, hypural 5 and pectoral fin pigment; width of gill openings; length of preopercular spines(in larvae). Size at settlement differed among some taxa, but all five species settled within a narrow size window ofc. 1·5 mm standard length( LS).Hypsoblennius invemar,H. ionthas,H. multifilisandS. cristatasettled at mean sizes between 11·3 and 12·1 mmLS, whereasP. marmoreussettled at a mean size of 19·3 mmLS. Sexually dimorphic differences were consistently evident by 17–18 mmLS in all species butP. marmoreus. The two smallest blennies with external characters normally associated with sexual maturity were a 20 mm male and 21 mm femaleH. multifilis. Primary caudal fin rays began to bifurcate between 17·0 and 18·3 mmLS inH. invemar,H. ionthas,H. multifilisandS. cristata.Hypleurochilus multifilisdisplayed the external characteristics of being sexually mature at 20–21 mmLS. Thus, bifurcation of primary caudal fin rays was an indicator of approaching sexual maturity inH. multifilisand this may also be true in the other species studied. [ABSTRACT FROM AUTHOR]
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Abstract:Light trap collections on oil and gas platforms in the northern Gulf of Mexico off Louisiana from 1995 to 1997 contained young of tessellated blennyHypsoblennius invemar, freckled blennyHypsoblennius ionthas, featherduster blennyHypleurochilus multifilis, molly millerScartella cristataand seaweed blennyParablennius marmoreus, which are described. Interspecific differences were: number of dorsal, anal, pelvic and caudal fin elements; number of mandibular pores; presence or absence of canine teeth, hypural 5 and pectoral fin pigment; width of gill openings; length of preopercular spines(in larvae). Size at settlement differed among some taxa, but all five species settled within a narrow size window ofc. 1·5 mm standard length( LS).Hypsoblennius invemar,H. ionthas,H. multifilisandS. cristatasettled at mean sizes between 11·3 and 12·1 mmLS, whereasP. marmoreussettled at a mean size of 19·3 mmLS. Sexually dimorphic differences were consistently evident by 17–18 mmLS in all species butP. marmoreus. The two smallest blennies with external characters normally associated with sexual maturity were a 20 mm male and 21 mm femaleH. multifilis. Primary caudal fin rays began to bifurcate between 17·0 and 18·3 mmLS inH. invemar,H. ionthas,H. multifilisandS. cristata.Hypleurochilus multifilisdisplayed the external characteristics of being sexually mature at 20–21 mmLS. Thus, bifurcation of primary caudal fin rays was an indicator of approaching sexual maturity inH. multifilisand this may also be true in the other species studied. [ABSTRACT FROM AUTHOR]
ISSN:00221112
DOI:10.1111/j.0022-1112.2005.00675.x