Life history scan using otolith Sr：Ca ratios of diadromous fish in the Gouno River, western Japan.

Rhinogobius formosanus Oshima, 1919 has long been considered an amphidromous goby. However, a landlocked population recently found in the Jingualiao Creek upstream of the Feitsui Reservoir in Taipei suggests that R. formosanus may complete its life in the river. This study aims to verify the habitat use of the landlocked population of R. formosanus collected from the Feitsui Reservoir and an amphidromous population collected in Malian Creek using otolith Sr:Ca ratio analysis. The hypothesis that early life history varies between the landlocked and migratory gobies was also tested. Genetic analyses show that the Feitsui Reservoir and Malian Creek populations are not genetically different. Rhinogobius formosanus from Malian Creek showed high-to-low otolith Sr:Ca ratios suggesting that these specimens spent a planktonic larval stage in the sea followed by a freshwater life at later stages. In contrast, R. formosanus from the Feitsui Reservoir showed constant lower otolith Sr:Ca ratios, implying a landlocked life history of fish in the creek upstream of the reservoir. In addition, the analysis of growth increments showed a longer pelagic larval duration for the fish in the Malian Creek (58.8 days) than those in the Feitsui Reservoir (38.8). Variation of pelagic larval duration in two genetically homogenous populations implies acclimatization to the reservoir by the landlocked gobies. This study shows that R. formosanus, like some other congeners, is capable of adapting to a freshwater landlocked environment in its early developmental stage and supports the hypothesis that landlocked populations may have a shorter pelagic larval duration.

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Migratory life history of European eel Anguilla anguilla from freshwater regions of the River Asi, southern Turkey and their high otolith Sr:Ca ratios

Journal of Fish Biology ◽

10.1111/j.1095-8649.2011.02903.x ◽

2011 ◽

Vol 78 (3) ◽

pp. 860-868 ◽

Cited By ~ 10

Author(s):

Y.-J. Lin ◽

S. Yalçin-Özdilek ◽

Y. Iizuka ◽

A. Gümüş ◽

W.-N. Tzeng

Keyword(s):

Life History ◽

Anguilla Anguilla ◽

European Eel ◽

Otolith Sr:Ca Ratios ◽

Southern Turkey ◽

History Of ◽

Sr:Ca Ratios

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movements and life history patterns of the skipjack tuna katsuwonus pelamis in the western pacific, as revealed by otolith sr:ca ratios

Journal of the Marine Biological Association of the United Kingdom ◽

10.1017/s0025315405012336 ◽

2005 ◽

Vol 85 (5) ◽

pp. 1211-1216 ◽

Cited By ~ 15

Author(s):

takaomi arai ◽

aya kotake ◽

sadaaki kayama ◽

miki ogura ◽

yoshiro watanabe

Keyword(s):

Life History ◽

Western Pacific ◽

Western Pacific Ocean ◽

Skipjack Tuna ◽

Katsuwonus Pelamis ◽

Otolith Sr:Ca Ratios ◽

Sr:Ca Ratios ◽

Life History Patterns ◽

Off Sanriku ◽

The Western Pacific

the strontium (sr) and calcium (ca) concentrations in the otoliths of the skipjack tuna katsuwonus pelamis collected in the western pacific ocean were examined by wavelength dispersive x-ray spectrometry on an electron microprobe. otolith sr:ca ratios of the tunas collected off the marshall islands in the tropical waters were constant over the life history transect of the otolith. in contrast, ratios in most tunas collected off sanriku in the temperate waters in october fluctuated from low to high at 1100–1800 μm from the core. a similar fluctuation of otolith sr:ca ratio from low to high was found in a skipjack tuna that was tagged and released off sanriku, and then recaptured off the palau islands. therefore, at least two life history patterns of the skipjack tunas, of global migration toward northern temperate regions and local residence in tropical spawning grounds, are suggested by specimens collected in the western pacific ocean.

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Contrasting life history patterns of the goby Rhinogobius similis in central Japan indicated by otolith Sr:Ca ratios

Ichthyological Research ◽

10.1007/s10228-015-0499-y ◽

2015 ◽

Vol 63 (2) ◽

pp. 288-293 ◽

Cited By ~ 2

Author(s):

Daisuke Ishizaki ◽

Takahiko Mukai ◽

Takeshi Kikko ◽

Taiga Yodo

Keyword(s):

Life History ◽

Central Japan ◽

Otolith Sr:Ca Ratios ◽

Sr:Ca Ratios ◽

Life History Patterns

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Habitat segregation and migration in tropical anguillid eels, Anguilla bengalensis bengalensis and A. bicolor bicolor

Scientific Reports ◽

10.1038/s41598-020-72788-9 ◽

2020 ◽

Vol 10 (1) ◽

Author(s):

Takaomi Arai ◽

Inn-Ju Chai ◽

Yoshiyuki Iizuka ◽

Chih-Wei Chang

Keyword(s):

Life History ◽

Habitat Use ◽

Habitat Preferences ◽

Sympatric Species ◽

Peninsular Malaysia ◽

Habitat Segregation ◽

Otolith Sr:Ca Ratios ◽

Sr:Ca Ratios ◽

And Migration ◽

Continental Growth

Abstract Anguillid eels of the genus Anguilla, which have a unique catadromous life history, are widely distributed across many parts of the world. However, little research has been conducted on the behavioural mechanisms of habitat segregation between sympatric species in tropical anguillid eels. To understand the ecological and behavioural mechanisms involved in the life history and migration of tropical anguillid eels, strontium (Sr):calcium (Ca) ratios were examined in otoliths of A. bengalensis bengalensis (41 specimens) and A. bicolor bicolor (130 specimens) collected from ten rivers in northwestern Peninsular Malaysia. The otolith Sr:Ca ratios revealed different habitat use between the two species. The broad range of otolith Sr:Ca ratios and habitat shift found in A. bicolor bicolor suggested that its habitat utilization was opportunistic in environments of varying salinity. A. bicolor bicolor prefers to live in the midstream to downstream areas with tidal influences. A. bengalensis bengalensis, however, was found to only reside in freshwater environments throughout their continental growth. A. bengalensis bengalensis tends to live in upstream area with no tidal influence. Their habitat use, migratory history, and habitat distribution indicate that habitat segregation occurs between the two species, leading to the different habitat preferences in tropical river systems.

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