Publications by authors named "Kaoru Narita"
The naticid snail Laguncula pulchella is an invasive species that preys on clams in tidal flats and has serious impacts on clam fisheries in Japan. Laguncula pulchella burrow in sand, but often crawl on sediment surfaces during low tide. We investigated seasonal changes in the abundance and sex ratio of crawling L.
View Article and Find Full Text PDFWe collected continuous sedimentary Cs concentration data from a shallow fishery ground (Matsukawa-ura Lagoon, Fukushima, Japan) in 2016 using a new compact underwater NaI(Tl) scintillation spectrometer and a quantitative technique. Cs concentrations in sediments were low (approx. 40 Bq/kg DW) at the lagoon mouth and high (641.
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- This study tracked the movements of 20 wild Japanese eels and 12 cultured eels in a lagoon in northeastern Japan using acoustic telemetry to understand their habitat use in different environments.
- 40% of wild eels remained near their release point for overwintering, while others showed varying degrees of movement between the lagoon and surrounding areas, which demonstrated behavioral flexibility.
- The study revealed key differences between wild and cultured eels, such as longer residency times and specific seasonal movements for wild eels, highlighting the importance of habitat connectivity among rivers, estuaries, and marine environments.
Original data (Cs and Cs, and sampling location) of marine products in Fukushima Prefecture monitored during 2011-2015 (n = 32,492) were analyzed to present an updated detailed description of radiocesium contamination after the Fukushima Dai-ichi Nuclear Power Plant (FDNPP) accident and to examine taxon/habitat-specific decreasing trends in different areas. Furthermore, marine species data presented by the Tokyo Electric Power Company (TEPCO) during 2012-2015 (n = 5458) were analyzed to evaluate the decreasing trends of Cs inside and outside (within a 20 km radius) of the FDNPP port. Monitoring results by Fukushima Prefecture show that percentages of samples higher than the Japanese regulatory limit of 100 Bq kg-wet (>RL%) were higher, whereas those below the detection limit (