Comparison between surface-reading and cross-section methods using sagittal otolith for age determination of the marbled sole Pseudopleuronectes yokohamae

To find an appropriate method for age determination in the marbled sole Pseudopleuronectes yokohamae in Tokyo Bay, Japan, sagittal otoliths of 1,343 individuals were observed by surface-reading and cross-section methods and the results were compared. Opaque zones occurred once a year and were regarded as annuli in both methods. The surface-reading method sometimes provided a lower count of the number of annuli than the cross-section method, and the frequency of this discrepancy was highest in older fish (males above 5 years, females above 4 years). The oldest female fish was estimated to be age 10 years by the cross-section method but 8 years by the surface-reading method. The cross-section method could provide a more accurate estimate of age and is therefore likely to be indispensable to estimations of longevity. In contrast, the surface-reading method is superior in terms of cost and time efficiency but is likely to underestimate the ages of older fish. However, growth equations based on age estimated by the surface-reading method were sufficiently accurate if males ?5 years and females ?4 years were combined as specific, single age groups of 5+ and 4+, respectively

EVALUASI PENGENDALIAN INTERNAL ATAS SIKLUS PENDAPATAN PADA PT. INDOKREATIF PRAKARSA

EVALUASI PENGENDALIAN INTERNAL ATAS SIKLUS PENDAPATAN PADA PT. INDOKREATIF PRAKARSA

EVALUASI SISTEM PENGENDALIAN INTERNAL TERHADAP SIKLUS PENDAPATAN PADA PT TKP

EVALUASI SISTEM PENGENDALIAN INTERNAL TERHADAP SIKLUS PENDAPATAN PADA PT TKP

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EVALUASI PENGENDALIAN INTERNAL TERHADAP SIKLUS PENDAPATAN PADA PT PROFON ELECTRIC CABLE

PENERAPAN SISTEM ABC UNTUK PERHITUNGAN BIAYA OPERASIONAL JASA TRANSPORTASI PADA CV. JAKARTA BANGKA EXPRESS

PENERAPAN SISTEM ABC UNTUK PERHITUNGAN BIAYA OPERASIONAL JASA TRANSPORTASI PADA CV. JAKARTA BANGKA EXPRESS

AUDIT MANAJEMEN ATAS FUNGSI SUMBER DAYA MANUSIA PADA PT. EVERBEST

AUDIT MANAJEMEN ATAS FUNGSI SUMBER DAYA MANUSIA PADA PT. EVERBEST

ANALISA DAN PERANCANGAN SISTEM INFORMASI AKUNTANSI SIKLUS PENDAPATAN DAN PIUTANG PADA PERUMAHAN BANJAR WIJAYA

ANALISA DAN PERANCANGAN SISTEM INFORMASI AKUNTANSI SIKLUS PENDAPATAN DAN PIUTANG PADA PERUMAHAN BANJAR WIJAYA

ANALISIS DAN PERANCANGAN SISTEM INFORMASI AKUNTANSI SIKLUS PENDAPATAN DAN PIUTANG PADA CV. GLOBAL PERKASA

ANALISIS DAN PERANCANGAN SISTEM INFORMASI AKUNTANSI SIKLUS PENDAPATAN DAN PIUTANG PADA CV. GLOBAL PERKASA