Mitsuhiko Sano

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To clarify the feeding habits of seagrass fishes, we examined the gut contents from 42 fish species collected in seagrass habitats in Trang. Thirteen species showed ontogenetic and/or seasonal changes in food-use patterns. Smaller individuals generally preyed on small planktonic items (e.g., copepod larvae) or small benthic/epiphytic crustaceans (e.g.,(More)
In order to clarify the mechanisms determining fish distribution patterns in a mangrove system on Iriomote Island, in southern Japan, fish assemblage structures were determined by visual observation, along with food abundance and environmental factors, in an area of mangrove roots on the banks, and a bare sand area at the center, within downstream,(More)
To determine the effects of shore-parallel offshore breakwaters on the surf-zone fish assemblage structure of a sandy beach, three study sites (sheltered inshore of breakwater, between adjacent breakwaters, and exposed without breakwaters) were sampled at Ohnuki Beach in Tokyo Bay, central Japan, in September and December 2009 and March and June 2010.(More)
The seagrass Zostera marina is characterized by either an annual phenotype, which flourishes during spring and dies off in other seasons, or a perennial phenotype, which lives for several years. To determine the influences of such differences in seagrass life cycles on fish assemblage structures, fish sampling and environmental measurements were conducted(More)
Fish assemblage structures in an intertidal sand/mud area invaded by short seagrass Halophila ovalis and a nearby non-invaded sand/mud area in Trang Province, Thailand, were examined in detail by visual census to elucidate the effects of such habitat change on assemblage structure. The assemblage structure in the newly established seagrass bed showed a(More)
To determine the food habits of salt marsh fishes, the gut contents of 28 species, caught from a salt marsh in Lake Hinuma, Ibaraki Prefecture, central Japan, were investigated. Ontogenetic changes in diet were apparent in six species, including several of commercial importance (e.g., Acanthopagrus schlegelii and Hypomesus nipponensis). Smaller juveniles of(More)
Estuarine and marine habitat use patterns in the halfbeak Zenarchopterus dunckeri were examined at Iriomote Island, southern Japan, by analyzing otolith Li/Ca and Sr/Ca ratios. The ranges of both Li/Ca and Sr/Ca ratios in juvenile Z. dunckeri from the maximum (30 psu) to minimum (0.5 psu) salinity levels of brackish water estimated from rearing experiments,(More)
To determine the effects of artificial headlands (groins with an anchor-shaped head portion) on the surf-zone fish assemblage structure of a sandy beach with strong wave action, three study sites (headland site sheltered behind the head portion, pocket-beach site between two adjacent headlands and exposed reference site without headlands) were sampled on(More)
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