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Habitat Selection, Growth Rate and Density of Juvenile Panulirus Japonicus (Von Siebold, 1824) (Decapoda, Palinuridae) At Banda, Chiba Prefecture, Japan

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[Preliminary observations via SCUBA found juvenile Panulirus japonicus using small holes as a daytime refuge in the rock surface of shallow reefs (2-3 m below Chart Datum) adjacent to the Banda Marine Laboratory of Tokyo University of Fisheries. Monthly samples of juvenile P. japonicus and regular observations along a vertical rock face (area 53.2 m2) were carried out between April 1991 and December 1992, in order to detail the growth rate, density on the reef face, morphology of holes occupied and period of retention of juveniles in individual holes. Peak settlement of pueruli occurred in September with pueruli and first stage juveniles using holes of a mean diameter of approximately 12±4 mm. Initially pholad holes, predominantly of the species Lithophaga curta, were used by juveniles at Banda, however with growth the availability of suitably sized pholad holes diminished and holes of various morphologies were used. At the observation site, pueruli and first stage specimens were followed over several consecutive molts. Mean intermolt period increased with juveniles size and molting from the first through to the sixth molt stage required approximately 2.5 months (78.5±2.2 days). The maximum number of individuals on the rock face occurred immediately after peak settlement in autumn (0.21 and 0.32 inds.m-2, September 1991 and 1992 respectively) with this density declining prior to winter. Densities on the rock face from November (0.094 inds.m-2) remained relatively constant over winter period and from May/June declined further as juveniles changed from using holes to cave/crevice style habitats situated off the rock face. Growth rate of juvenile P. japonicus was fast, from peak settlement ofpueruli [carapace length (C.L.) ~ 7.5 mm] in September, a mean size of C.L. 35-40 mm was attained after one year. Recruitment to the fishery (minimum landing size C.L. 42 mm) is estimated to occur over the second winter after settlement as a puerulus., Preliminary observations via SCUBA found juvenile Panulirus japonicus using small holes as a daytime refuge in the rock surface of shallow reefs (2-3 m below Chart Datum) adjacent to the Banda Marine Laboratory of Tokyo University of Fisheries. Monthly samples of juvenile P. japonicus and regular observations along a vertical rock face (area 53.2 m2) were carried out between April 1991 and December 1992, in order to detail the growth rate, density on the reef face, morphology of holes occupied and period of retention of juveniles in individual holes. Peak settlement of pueruli occurred in September with pueruli and first stage juveniles using holes of a mean diameter of approximately 12±4 mm. Initially pholad holes, predominantly of the species Lithophaga curta, were used by juveniles at Banda, however with growth the availability of suitably sized pholad holes diminished and holes of various morphologies were used. At the observation site, pueruli and first stage specimens were followed over several consecutive molts. Mean intermolt period increased with juveniles size and molting from the first through to the sixth molt stage required approximately 2.5 months (78.5±2.2 days). The maximum number of individuals on the rock face occurred immediately after peak settlement in autumn (0.21 and 0.32 inds.m-2, September 1991 and 1992 respectively) with this density declining prior to winter. Densities on the rock face from November (0.094 inds.m-2) remained relatively constant over winter period and from May/June declined further as juveniles changed from using holes to cave/crevice style habitats situated off the rock face. Growth rate of juvenile P. japonicus was fast, from peak settlement ofpueruli [carapace length (C.L.) ~ 7.5 mm] in September, a mean size of C.L. 35-40 mm was attained after one year. Recruitment to the fishery (minimum landing size C.L. 42 mm) is estimated to occur over the second winter after settlement as a puerulus.]

Affiliations: 1: Department of Aquatic Biosciences, Tokyo University of Fisheries, 4-5-7 Konan, Minato-ku, Tokyo 108, Japan; 2: Seikai National Fisheries Research Institute, 49 Kokubu-machi, Nagasaki 850, Japan

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/content/journals/10.1163/156854094x00099
1994-01-01
2016-12-10

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