Age and birth date of the glass eel, Anguilla japonica, collected in Taiwan.

Umezawa, Akima; Tsukamoto, Katsumi

doi:10.2331/suisan.56.1199

Cited by 23 publications

(10 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…According to the age determinations we have done, the growth rate of A . marmorata leptocephali was estimated to range from 0.41 mm/day to 0.44 mm/day, which is considerably less than that reported for the temperate eel A. japonica (0.56–0.59 mm/day), 31,32 which has a similar length at the leptocephalus stage (116–138 days) 3 …”

Section: Discussionmentioning

confidence: 72%

Inshore migration of a tropical eel, Anguilla marmorata, from Taiwanese and Japanese coasts

et al. 2002

Self Cite

View full text Add to dashboard Cite

The otolith microstructure and microchemistry of a tropical eel, Anguilla marmorata, were examined in glass eels collected from Taiwanese and Japanese coasts. Ages at metamorphosis (onset of metamorphosis) and recruitment, respectively, were 114 ± 13.8 (mean ± SD) days and 144 ± 15.7 days in Taiwanese stock, and 123 ± 13.9 days and 154 ± 17.3 days in Japanese stock. No significant differences were found in ages between the two stocks. The duration of metamorphosis estimated from otolith microstructure was 10–24 days, which is the same in the different stocks. For both stocks examined, close linear relationships were found between ages at metamorphosis and recruitment, suggesting that individuals that metamorphosed earlier were recruited to the coasts at a younger age.

show abstract

Section: Discussionmentioning

confidence: 72%

Inshore migration of a tropical eel, Anguilla marmorata, from Taiwanese and Japanese coasts

et al. 2002

Self Cite

View full text Add to dashboard Cite

show abstract

“…A number of studies on the life history of the elver in Taiwanese estuaries have been conducted, including reports on age and birth date (Tabeta et al, 1987;Tzeng, 1990;Umezawa & Tsukamoto, 1990), stock identification and larval migration (Tzeng & Tsai, 1992), immigration timing in relation to environmental cues (Tzeng, 1 9 8 4~~ 1985), and exploitation rates (Tzeng, 1984b). However, little is known concerning the ecology of the adult eel in the freshwater streams of Taiwan.…”

Section: Introductionmentioning

confidence: 99%

Relative abundance, sex ratio and population structure of the Japanese eel Anguilla japonica in the Tanshui River system of northern Taiwan

Tzeng

Cheng

Lin

1995

Journal of Fish Biology

View full text Add to dashboard Cite

From the Gong-Shy-Tyan (GST) Stream and the Tanshui River, Taiwan, eels ranged from 5.53 cm T.L. (elvers) to 72.5 cm T.L. Anguilla japonica accounted for 93-99' %1, A. wlarnzoiatu 1-7'%1 and A. bicolurpacifca less than 1%) of all eels caught. Mean eel lengths increased from l0cm T.L. at the downstream sites to 50cm T.L. at the upstream sites. Females made up 92.8%) of the sex-determined eels. Population density, averaged approximately 0.14 eel m ~'(2.42 g m ~ ' ) and 0.25 eel m -* (0.92 g m ~ ' ) in downstream sites of the GST and Tanshui River, respectively, and decreased substantially with upstream distance. Eels were rarely found in the heavily polluted and dam constructed areas in the midstream site of the Tanshui River.

show abstract

“…One possibility might be the heritable differences in larval durations between southern and northern groups. Since the newly arrived recruits are quite similar in TL (Tsukamoto 1990, Umezawa & Tsukamoto 1990, Cheng & Tzeng 1996, Kawakami et al 1999, Chang et al 2007) indicating a size-dependent metamorphosis of the leptocephali in the Japanese eel, it is likely that the fast-growing leptocephali have a heritable short larval duration and mostly metamorphose in the south, while the slow-growing ones with a heritable long larval duration may mostly drift north along with the KC. We tested this possibility by examining genetic differentiation between eel groups with different larval durations.…”

Section: Evidence Of Panmixia In the Japanese Eelmentioning

confidence: 99%

Population genetic structure of the Japanese eel Anguilla japonica: panmixia at spatial and temporal scales

Han

Hung²,

Liao³

et al. 2010

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

Since the 1970s, the population of the Japanese eel Anguilla japonica has dramatically declined in East Asia. Consequently, conservation and resource management of this species are urgently required. However, the population genetic structure of this species, in temporal and spatial scales, is still poorly understood. We used 8 polymorphic microsatellite DNA loci to investigate its genetic composition. For cohort analysis, juvenile (glass) eels were collected yearly between 1986 and 2007 from the Danshui River, Taiwan; for arrival wave analysis, glass eels were collected monthly from Fulong Estuary, Taiwan; and for spatial analysis, glass eels were collected from Taiwan, China, Korea and Japan. Genetic differentiation among annual cohorts, arrival waves and spatial samples was very low; a significant difference was observed among annual cohorts and spatial samples, but not among arrival waves. However, specific temporal or spatial scale patterns were not seen in either pairwise genetic comparisons or the phylogenetic tree of all samples. Occasional genetic variations among samples occurred randomly, but a stable lasting genetic structure could not be formed. The isolation by distance (IBD) test showed no evidence of genetic structuring at the spatial scale, and the results of the isolation by time (IBT) test were insignificant among arrival waves. Genetic heterogeneity over a 21 yr time scale showed marginal significance, potentially reflecting a genetic drift in the Japanese eel. Our results suggest the existence of a single panmictic population of Japanese eel in East Asia. Therefore, the Japanese eel should be considered as a single management unit for conservation.

show abstract

Age and birth date of the glass eel, Anguilla japonica, collected in Taiwan.

Cited by 23 publications

References 1 publication

Inshore migration of a tropical eel, Anguilla marmorata, from Taiwanese and Japanese coasts

Inshore migration of a tropical eel, Anguilla marmorata, from Taiwanese and Japanese coasts

Relative abundance, sex ratio and population structure of the Japanese eel Anguilla japonica in the Tanshui River system of northern Taiwan

Population genetic structure of the Japanese eel Anguilla japonica: panmixia at spatial and temporal scales

Contact Info

Product

Resources

About