Seasonal Occurrence of Anguillid Elvers in Cagayan River, Luzon Island, the Philippines

Tabeta, Osame; Tanimoto, Tsutomu; Takai, Toru; Matsui, Isao; Imamura, Tomohiro

doi:10.2331/suisan.42.421

Cited by 38 publications

(48 citation statements)

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“…Because metamorphosis triggers a behavioral switch from pelagic migration to bottom settlement, A. japonica leptocephali which arrive in Philippine waters are apparently too young to metamorphose and migrate towards estuaries so they continue drifting northwards or southwards. This must be the reason why Japanese eels are seldom found in the Philippines, while A. marmorata occurs in abundance (Tabeta et al 1975(Tabeta et al , 1976. A similar scenario was also observed in American and European eels, for which differences in the duration of the leptocephalus stage and growth rates were the principal factors triggering segregative migration of these two species in the Atlantic Ocean (Wang and Tzeng 2000).…”

Section: Discussionmentioning

confidence: 84%

Effects of metamorphosis timing and the larval growth rate on the latitudinal distribution of sympatric freshwater eels, Anguilla japonica and A. marmorata, in the western North Pacific

et al. 2013

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Background: Early life history traits of the temperate eel Anguilla japonica and tropical eel Anguilla marmorata were examined to determine the possible reason why these two species have similar spawning areas and oceanic larval transport in the North Equatorial Current and yet are recruited to different but partly overlapping continental growth habitats in northern East Asia. To understand the segregative migration of these two sympatric eel species, their glass eels were collected from nine estuaries in the Philippines, Taiwan, Japan, and China. The age at metamorphosis from leptocephalus to glass eel (T m ), the age at estuarine arrival (T t ), the time between metamorphosis and estuarine arrival (T t−m ), and the growth rate (G t ) of glass eels were calculated from daily growth increments in their otoliths. Results: Results indicated that the G t was faster and the T m was younger in A. marmorata than in A. japonica. On the other hand, fish length and the T t at estuarine arrival were larger in A. japonica than in A. marmorata, indicating that elvers of A. japonica experience a longer oceanic drift than those of A. marmorata. In addition, the T t−m also indicated that A. japonica experienced a longer coastal migration than A. marmorata.

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Section: Discussionmentioning

confidence: 84%

Effects of metamorphosis timing and the larval growth rate on the latitudinal distribution of sympatric freshwater eels, Anguilla japonica and A. marmorata, in the western North Pacific

et al. 2013

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“…Both species have been collected in relatively large numbers (800 to 1000 elvers) in the Cagayan River estuary in some years (Tabeta et al 1976). Therefore, although A. celebesensis has not been genetically identified from the NEC in the summer or early fall, it is possible that it was not detected among the A. marmorata leptocephali because of the similar morphology of these 2 species.…”

mentioning

confidence: 89%

Larval duration of the tropical eel Anguilla celebesensis from Indonesian and Philippine coasts

Arai¹,

Miller²,

Tsukamoto³

2003

Mar. Ecol. Prog. Ser.

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A comparative study of the otolith microstructure of glass eels Anguilla celebesensis from the Indonesian and Philippine coasts determined the timing of metamorphosis and age at recruitment to freshwater habitats; 2 samples from Indonesia were analyzed and statistically compared with a previously published sample analyzed using the same techniques. Ages at metamorphosis and at recruitment were, respectively: 98 ± 7.2 d (mean ± SD) and 122 ± 7.2 d for specimens from the Poso River in Indonesia; 90 ± 13.6 and 112 ± 14.2 d for specimens from the Poigar River in Indonesia; and 124 ± 12.0 and 157 ± 13.7 d for specimens from the northern Philippines. The average duration of metamorphosis was very similar (15 to 17 d) in all specimens. A close linear relationship was found between age at metamorphosis and age at recruitment. These findings and the regional geography of the islands and ocean currents suggest that A. celebesensis has several spawning areas and potentially isolated populations in the region, as has been suggested for another, more widely distributed tropical anguillid, A. marmorata. KEY WORDS: Glass eels · Otolith microstructure · Metamorphosis · Recruitment · Ocean currentsResale or republication not permitted without written consent of the publisher

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“…January and February were chosen for the collection of specimens because A. japonica had been found during those 2 months in the previous study (Tabeta et al 1976). The specimens were immediately preserved in 99.5% (v/v) ethanol and transferred to the laboratory at ambient temperature.…”

Section: Glass Eelsmentioning

confidence: 99%

“…Except for this record, however, there has been no scientific survey for the occurrence of A. japonica in the northern Philippines, and thus, the present status is unknown at the southern edge of the species range. In this study, accordingly, we collected glass eels at the same place where the previous study (Tabeta et al 1976) had identified the recruitment of A. japonica in the 1970s and carried out species identification to verify the occurrence of this species on northern Luzon Island.…”

Section: Introductionmentioning

confidence: 99%

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Occurrence and biological characteristics of glass eels of the Japanese eel Anguilla japonica at the Cagayan River of Luzon Island, Philippines in 2009

et al. 2014

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Background: The Japanese eel Anguilla japonica spawns in the North Equatorial Current in the Philippine Sea and their larvae are transported to their freshwater growth habitats in East Asia. Here we report the occurrence and biological characteristics of glass eels of A. japonica that were collected on northern Luzon Island of the Philippines, the southern limit of the distribution range of this species. Anguillid glass eels recruiting to the Cagayan River estuary in January and February 2009 were collected and identified using their morphological and genetic characteristics. Results: Among the 767 specimens, 52 glass eels collected in January were found to be A. japonica, while the remaining were tropical anguillid species. Age estimation revealed that the glass eels of A. japonica from northern Luzon Island were 147.2 ± 21.3 days old (mean ± sd) with a range between 111 and 185. The hatch dates of these A. japonica suggested that they were derived from at least four spawning events in the 2008 spawning season.

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Seasonal Occurrence of Anguillid Elvers in Cagayan River, Luzon Island, the Philippines

Cited by 38 publications

References 0 publications

Effects of metamorphosis timing and the larval growth rate on the latitudinal distribution of sympatric freshwater eels, Anguilla japonica and A. marmorata, in the western North Pacific

Effects of metamorphosis timing and the larval growth rate on the latitudinal distribution of sympatric freshwater eels, Anguilla japonica and A. marmorata, in the western North Pacific

Larval duration of the tropical eel Anguilla celebesensis from Indonesian and Philippine coasts

Occurrence and biological characteristics of glass eels of the Japanese eel Anguilla japonica at the Cagayan River of Luzon Island, Philippines in 2009

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