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Environmental DNA reflects spatial and temporal jellyfish distribution

Recent development of environmental DNA (eDNA) analysis allows us to survey underwater macro-organisms easily and cost effectively; however, there have been no reports on eDNA detection or quantification for jellyfish. Here we present the first report on an eDNA analysis of marine jellyfish using Japanese sea nettle (Chrysaora pacifica) as a model species by combining a tank...

Moderate turbidity enhances schooling behaviour in fish larvae in coastal waters

We evaluated the effects of turbidity on school formation in ayu (Plecoglossus altivelis) [24.5 ± 2.2 mm standard length (Ls)], Japanese anchovy (Engraulis japonicus) (29.1 ± 3.1 mm Ls) larvae, which often live in turbid coastal waters, and yellowtail (Seriola quinqueradiata) juveniles (37.1 ± 2.5 mm Ls), which live in clear offshore waters. Fish were introduced into experimental...

Correction: Environmental DNA as a 'Snapshot' of Fish Distribution: A Case Study of Japanese Jack Mackerel in Maizuru Bay, Sea of Japan

Takahashi Hideki Sawada Hiroaki Murakami Satsuki Tsuji Hiroki Hashizume Shou Kubonaga Tomoya Horiuchi Masamichi Hongo Jo Nishida Yuta Okugawa Ayaka Fujiwara Miho Fukuda Shunsuke Hidaka Keita W. Suzuki Masaki

Environmental DNA as a ‘Snapshot’ of Fish Distribution: A Case Study of Japanese Jack Mackerel in Maizuru Bay, Sea of Japan

Recent studies in streams and ponds have demonstrated that the distribution and biomass of aquatic organisms can be estimated by detection and quantification of environmental DNA (eDNA). In more open systems such as seas, it is not evident whether eDNA can represent the distribution and biomass of aquatic organisms because various environmental factors (e.g., water flow) are...

Application of the Gross Theory of β-Decay to Delayed Neutron Emissions

Kohji TAKAHASHI 0 0 Department of Applied Physics, Waseda University , Shinjuku-ku, Tokyo Delayed neutron emission is investigated theoretically. First, the strength functions for the allowed and

Gross Theory of First Forbidden β-Decay

Kohji TAKAHASHI 0 0 Department of Applied Physics, W aseda University Shinjuku-ku , Tokyo The gross theory of nuclear /3-decay developed by Yamada, Takahashi and Koyama for allowed transitions is

Gross Theory of Nuclear β-Decay

A theory for the gross properties of the nuclear β-decay is developed. In order to treat the gross features, summations over final states are replaced by integrations, and the average of the squared absolute value of the nuclear matrix element times the final level density (this quantity is denoted by |MΩ(E)|2 where -E is the decay energy) is investigated instead of individual...

Gross Theory of β-Decay and Its Application to the Fermi Matrix Element

The gross theory of nuclear β-decay proposed by Takahashi and Yamada is reinvestigated. A revised model for treating the even-odd mass difference is set up and is applied to the calculation of the squared Fermi matrix elements. The results for the superallowed transitions agree well with those expected from the isospin formalism except for the transitions from odd-odd to even...