Seasonal variation in the migratory history of the Japanese eel Anguilla japonica in Mikawa Bay, Japan

Kotake, Aya; Okamura, Atsushi; Yamada, Yoshiaki; Utoh, Tomoko; Arai, Takaomi; Miller, Michael J.; Oka, Hideo; Tsukamoto, Katsumi

doi:10.3354/meps293213

Cited by 77 publications

(91 citation statements)

References 38 publications

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“…Many studies based on otolith microchemistry have hypothesised that, among a single eel population, different life-history tactics coexist, related to the choice of habitat (marine, brackish, freshwater) or a shift of habitat (Tzeng et al 2000a, 2003, Tsukamoto & Arai 2001, Jessop et al 2002, Limburg et al 2003, Arai et al 2004, Daverat et al 2005, Kotake et al 2005. However, most studies are qualitative and only describe the occurrence of a certain tactic; they do not always evaluate the proportion of the river basin population involved.…”

Section: Introductionmentioning

confidence: 99%

“…Morrison et al (2003) showed that Anguilla rostrata estuarine residents and 'freshwater to estuary mode' nomads have similar growth rates, which are higher than those of freshwater residents, whereas Tzeng et al (2002) only found significantly different growth rates between similar ecophenotypes of A. japonica for the first 5 yr of life, using retrospective growth analysis. A recent study by Kotake et al (2005) pointed out that eels, which were collected in a Japanese bay, with different types of habitat use (estuarine, marine and freshwater eels) emigrate as female silver eels at the same size.…”

Section: Introductionmentioning

confidence: 99%

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Tactics and demographic attributes in the European eel Anguilla anguilla in the Gironde watershed, SW France

Daverat¹,

Tomás²

2006

Mar. Ecol. Prog. Ser.

107

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The patterns of habitat use and their relative proportions were investigated for 270 eels Anguilla anguilla sampled in coastal areas, the estuary and the river of the Gironde watershed, by measuring Sr and Ca concentrations in the otolith. Sr:Ca values outside the elver mark discriminated residence in the same habitat until capture (freshwater, estuary, or sea) from a switch of habitat following 3 patterns: a shift from freshwater to estuarine, seasonal movements within the limits of the estuary, or a switch of habitat from brackish to freshwater (downstream nomads). Results show a gradient of residency from freshwater (100%) to estuary (44%) to the sea (24%). The most abundant (30%) alternative to residence in an estuary and its adjacent coastal site were the downstream nomads, which concentrated in coastal areas and the lower part of the estuary after leaving freshwater. Overall, up to 50% of the eels analysed had spent a period in freshwater. Fish growth rates in freshwater were lower than anywhere else in the watershed. Back-calculation of fish sizeat-age showed that, of all eels passing through freshwater, residents were slow growers, while downstream nomads were fast growers. The latter migrate to the estuary at Ages 2+ and 3+, when their size is greater than estuarine residents. Results revealed that lower estuarine and marine habitats are colonised by yellow rather than glass eels. This suggests that competition with estuarine residents and downstream nomads prevents precocious settlement of glass eels in estuary and marine habitats.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Tactics and demographic attributes in the European eel Anguilla anguilla in the Gironde watershed, SW France

Daverat¹,

Tomás²

2006

Mar. Ecol. Prog. Ser.

107

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“…The averages In the sensitivity tests, S15-S17 cover the entire plausible range and, consequently, the underreported catch does not affect the present results. It is a possibility that Japanese statistics do not include part of the catch in the coastal zone [44]; however, the effect of the catch is small because the scale of fisheries exploiting the stock in the sea is relatively tiny compared to that in freshwater fisheries.…”

Section: Discussionmentioning

confidence: 99%

Stock assessment of Japanese eels using Japanese abundance indices

Tanaka

2014

Fish Sci

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The paper compiles a catch history of Japanese eels Anguilla japonica in East Asia and some Japanese relative abundance series. Maximum likelihood estimates of stock abundance of eels have been obtained using the abundance series and various biological parameters, such as growth, maturity and natural mortality. Age-and sexstructured models have been used to express the dynamics of stock abundance, and the Beverton and Holt model has been used to express the relationship between stock and recruitment. Data for estimations are standardized catch per unit effort of commercial fishery for exploitable stock (1954-2006 and 1968-2008) and for glass eel (1954-2010, 1972-2004, and 1973-1997). From the results of the base case scenario of estimations, the estimated stock size of individuals aged C1 year was 18.7 thousand tons in 2010, which was 24 % of the carrying capacity. The estimated stock size has recovered since 1990. Maximum sustainable yield was 4,180 tons if only the exploitable stock were utilized, and 266 tons if only the glass eel were utilized. These results and issues relating to estimation and management for reducing the fishery impact on stock are discussed.

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“…The Japanese eel, widely distributed in eastern Asia from Taiwan, through eastern China, and north to Korea and Japan (Kotake et al 2007), spawns far offshore in the ocean to the west of the Mariana Islands in the western North Pacific (Tsukamoto 1992). Previously, the Japanese eel was regarded as a catadromous fish with a freshwater growth stage, but recent fine studies (Tsukamoto Kotake et al 2003Kotake et al , 2005Kotake et al , 2007 demonstrated that the Japanese eel needs not be catadromous, but has variable life histories with or without migration to fresh waters, and that eel reproduction is mainly maintained by populations that grow in estuarine or coastal areas (Fig. 15).…”

Section: Contribution Of Mudflat Fauna In Coastal Ecosystemmentioning

confidence: 99%

Anthropogenic decline of the peculiar fauna of estuarine mudflats in Japan

Sato

2010

Plankton Benthos Res

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Mudflats are formed in the upper littoral zones in estuaries, especially in the innermost part of macro-tidal embayments (upper reaches of estuaries), providing a habitat for peculiar fauna and flora. The peculiar fauna and flora of estuarine mudflats appear to have been extirpated in many estuaries in Japan, along with the mudflats that have been damaged or destroyed by thoughtless and drastic coastal reclamation. At present, Ariake Bay, which constitutes the largest area of mudflats remaining in Japan, also has the greatest variety of species. The mudflat-specific species are almost or completely restricted to Ariake Bay, while populations of the same (or closely related) species are distributed along Asian continental coasts, which suggests they are continental relicts. Some of the mudflat-specific species now restricted to Ariake Bay (e.g.,the bivalve, Tegillarca granosa, the polychaete, Hediste japonica, the salt marsh plant, Suaeda japonica) previously enjoyed a wide distribution in Japan. Even within Ariake Bay, huge mudflats in Isahaya Bay were recently lost to a reclamation project there. The high productivity of benthic organisms in mudflats seems to benefit carnivores such as birds and fishes (e.g., Japanese eel). Conservation and restoration of mudflats are needed to conserve endangered species and to maintain traditional human fisheries and culture. From this aspect, restoration of the largest mudflats in Isahaya Bay in Ariake Bay is highly desirable.

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Seasonal variation in the migratory history of the Japanese eel Anguilla japonica in Mikawa Bay, Japan

Cited by 77 publications

References 38 publications

Tactics and demographic attributes in the European eel Anguilla anguilla in the Gironde watershed, SW France

Tactics and demographic attributes in the European eel Anguilla anguilla in the Gironde watershed, SW France

Stock assessment of Japanese eels using Japanese abundance indices

Anthropogenic decline of the peculiar fauna of estuarine mudflats in Japan

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