Identification and growth rates comparison of divergent migratory contingents of Japanese eel (Anguilla japonica)

Tzeng, Wann‐Nian; Iizuka, Yoshiyuki; Shiao, Jen‐Chieh; Yamada, Yoshiaki; Oka, Hideo

doi:10.1016/s0044-8486(02)00053-4

Cited by 73 publications

(68 citation statements)

References 25 publications

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“…Approx. 80% of A. japonica in the lower reach of the Kaoping River were estuarine-oriented, as was noted by Tzeng et al (2002Tzeng et al ( , 2003. In contrast, A. marmorata was mainly freshwater-oriented and apparently avoided residence in a brackish water environment, as inferred from the few Sr:Ca ratios higher than 4 × 10 -3 in the otoliths of the Type 3 eels (Table 2, Fig 6c,d).…”

Section: Different Migratory Behaviorsupporting

confidence: 58%

Disparities in habitat use and migratory behavior between tropical eel Anguilla marmorata and temperate eel A. japonica in four Taiwanese rivers

Shiao¹,

Iizuka²,

Chang³

et al. 2003

Mar. Ecol. Prog. Ser.

104

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Strontium (Sr):calcium (Ca) ratios in otoliths of the eels Anguilla japonica and A. marmorata caught in 4 Taiwanese rivers were examined to reconstruct their migratory environmental history. In all sampling locations, each eel species preferred a different environment and all were differently distributed in the river. A. japonica was more abundant than A. marmorata in the lower reach, accounting for 76 to 86% of the eel population. In contrast, A. marmorata was more abundant than A. japonica in the upper reach, accounting for 76 to 100% of the eel population. A. japonica consisted of diversified migratory contingents, including freshwater, brackish-water and seawater eels, but A. marmorata tended to reside in freshwater and seemed to avoid seawater during the yellow eel stage. This disparity in migratory behaviors and habitat use between species may reflect interspecific competition and adaptive radiation. The flexible migratory behavior and adaptation to different salinities of A. japonica may be an advantageous evolutional fitness when facing competition, heavy fishing pressure and environmental stress. The freshwater-restricted A. marmorata is more easily threatened by both fishing pressure and continuous habitat degradation than A. japonica.

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Section: Different Migratory Behaviorsupporting

confidence: 58%

Disparities in habitat use and migratory behavior between tropical eel Anguilla marmorata and temperate eel A. japonica in four Taiwanese rivers

Shiao¹,

Iizuka²,

Chang³

et al. 2003

Mar. Ecol. Prog. Ser.

104

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“…Jessop et al (2002) divided the American eel A. rostrata into freshwater and estuarine residents when otolith Sr:Ca ratios were < 4 × 10 -3 and > 5 × 10 -3 , respectively. Tzeng et al (2003) used the Sr:Ca ratio of 4 × 10 -3 in otoliths of the Japanese eel as a criterion to distinguish freshwater and seawater contingents of the eel. Otolith Sr:Ca ratios relative to ambient salinity seem similar among different species suggesting that their use to reconstruct the past salinity history of a fish is reliable.…”

Section: Sr:ca Otolith Ratios As Indicator Of Environmental Salinitymentioning

confidence: 99%

Migratory environmental history of the grey mullet Mugil cephalus as revealed by otolith Sr:Ca ratios

Chang¹,

Iizuka²,

Tzeng³

2004

Mar. Ecol. Prog. Ser.

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We used an electron probe microanalyzer (EPMA) to determine the migratory environmental history of the catadromous grey mullet Mugil cephalus from the Sr:Ca ratios in otoliths of 10 newly recruited juveniles collected from estuaries and 30 adults collected from estuaries, nearshore (coastal waters and bay) and offshore, in the adjacent waters off Taiwan. Mean (± SD) Sr:Ca ratios at the edges of adult otoliths increased significantly from 6.5 ± 0.9 × 10 -3 in estuaries and nearshore waters to 8.9 ± 1.4 × 10 -3 in offshore waters (p < 0.01), corresponding to increasing ambient salinity from estuaries and nearshore to offshore waters. The mean Sr:Ca ratios decreased significantly from the core (11.2 ± 1.2 × 10 -3 ) to the otolith edge (6.2 ± 1.4 × 10 -3 ) in juvenile otoliths (p < 0.001). The mullet generally spawned offshore and recruited to the estuary at the juvenile stage; therefore, these data support the use of Sr:Ca ratios in otoliths to reconstruct the past salinity history of the mullet. A life-history scan of the otolith Sr:Ca ratios indicated that the migratory environmental history of the mullet beyond the juvenile stage consists of 2 types. In Type 1 mullet, Sr:Ca ratios range between 4.0 × 10 -3 and 13.9 × 10 -3, indicating that they migrated between estuary and offshore waters but rarely entered the freshwater habitat. In Type 2 mullet, the Sr:Ca ratios decreased to a minimum value of 0.4 × 10 -3 , indicating that the mullet migrated to a freshwater habitat. Most mullet beyond the juvenile stage migrated from estuary to offshore waters, but a few mullet less than 2 yr old may have migrated into a freshwater habitat. Most mullet collected nearshore and offshore were of Type 1, while those collected from the estuaries were a mixture of Types 1 and 2. The mullet spawning stock consisted mainly of Type 1 fish. The growth rates of the mullet were similar for Types 1 and 2. The migratory patterns of the mullet were more divergent than indicated by previous reports of their catadromous behavior.

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“…Similarly, Tzeng et al (2003) observed higher estuarine growth in eel inhabiting semi-tropical regions, where freshwater systems are generally more productive than estuaries. Further, there are reports of growth rates of American eel inhabiting brackish waters in South Carolina being greater than those growing in brackish waters in the northern United States and Canada (Hansen and Eversole 1984).…”

Section: The Inconsistenciesmentioning

confidence: 73%

“…These patterns are consistent with the prediction that the proportion of eel residing in marine and estuarine habitats increases with latitude and that a latitudinal threshold exists where the suitability of marine and freshwater habitats is similar. For example, Tzeng et al (2003) found little difference in the proportions of A. japonica with different residence histories at 35°N latitude. The geographic position of a latitudinal threshold defining the frequency of American eel contingents would be an interaction between aquatic productivity and the size of leptocephali at arrival to coastal environments.…”

Section: Filling Information Gapsmentioning

confidence: 90%

“…Although, on average, growth rates of yellow and silver female eel are higher than males (Oliveira 1999;Oliveira and McCleave 2002;Tzeng et al 2003;Jessop et al 2004), some studies have found higher growth rates for males than females (Poole and Reynolds 1996;Holmgren et al 1997). One potential reason for this inconsistency may be an inability to accurately determine sex in young eel.…”

Section: The Inconsistenciesmentioning

confidence: 99%

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A synthesis of the ecological processes influencing variation in life history and movement patterns of American eel: towards a global assessment

Vélez‐Espino

Koops

2009

Rev Fish Biol Fisheries

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American eel, Anguilla rostrata, is a catadromous fish that spawns in the Sargasso Sea and migrates to coastal waters and freshwater systems ranging from Greenland down the Atlantic coast to South America and has been regarded as comprising a panmictic population. American eel is in decline across much of its range. Research and management is primarily conducted at local to regional scales, yielding inconsistent research results and management recommendations that may be inhibited by large-scale processes. We review the research on American eel ecology demonstrating that its variable life history and movement patterns can be explained based on: (1) latitudinal productivity gradients; (2) ideal free habitat selection; (3) conditional evolutionarily stable life history strategies; (4) size at arrival to the coast (correlated with distance from the spawning grounds); and, (5) temperature variance and annual degree-day effects on somatic growth. Using these ecological processes, we outline how local and largescale effects on American eel dynamics can be integrated in a panmictic (or quasi-panmictic) modelling framework to enable defensible predictions of population responses to anthropogenic and oceanic phenomena. Due to its widespread distribution and existing knowledge gaps, the conservation and management of American eel will require international cooperation.

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Identification and growth rates comparison of divergent migratory contingents of Japanese eel (Anguilla japonica)

Cited by 73 publications

References 25 publications

Disparities in habitat use and migratory behavior between tropical eel Anguilla marmorata and temperate eel A. japonica in four Taiwanese rivers

Disparities in habitat use and migratory behavior between tropical eel Anguilla marmorata and temperate eel A. japonica in four Taiwanese rivers

Migratory environmental history of the grey mullet Mugil cephalus as revealed by otolith Sr:Ca ratios

A synthesis of the ecological processes influencing variation in life history and movement patterns of American eel: towards a global assessment

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