Evidence map›Paper›PMID 34721978›Full record

ArticlePeerJ2021

Testis development in the Japanese eel is affected by photic signals through melatonin secretion.

Ji-Yeon Hyeon, Jun-Hwan Byun, Eun-Su Kim, Yoon-Seong Heo, Kodai Fukunaga, Shin-Kwon Kim, Satoshi Imamura, Se-Jae Kim, Akihiro Takemura, Sung-Pyo Hur

Open access · goldAbstract read
PubMed Full text at PMC Publisher
In one paragraph

Article in PeerJ, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.

0numbers the graph read from it
0cells of the map it votes in
1citing papers in PubMed
0.5field-weighted citation impact, top 43% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

1 citing paper in PubMed, 6 citations in OpenAlex.

  1. Clock Gene Expression in Eel Retina and Hypothalamus: Response to Photoperiod and Moonlight.Journal of experimental zoology. Part A, Ecological and integrative physiology · 2025
    Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

10 authors at 5 institutions in 2 countries.

Ji-Yeon HyeonJeju Marine Research Center, Korea Institute of Ocean Science and Technology, Jeju, Republic of Korea.
Jun-Hwan ByunJeju Marine Research Center, Korea Institute of Ocean Science and Technology, Jeju, Republic of Korea.
Eun-Su KimJeju Marine Research Center, Korea Institute of Ocean Science and Technology, Jeju, Republic of Korea.
Yoon-Seong HeoLED-Marine Biology Convergence Technology Research Center, Pukyong National University, Busan, Republic of Korea.
Kodai FukunagaCenter for Strategic Research Project, University of the Ryukyus, Okinawa, Japan.
Shin-Kwon KimAquaculture Research Division, National Institute of Fisheries Science, Busan, Republic of Korea.
Satoshi ImamuraGraduate School of Engineering and Science, University of the Ryukyus, Okinawa, Japan.
Se-Jae KimDepartment of Biology, Jeju National University, Jeju, Republic of Korea.
Akihiro TakemuraDepartment of Chemistry, Biology and Marine Science, Faculty of Science, University of the Ryukyus, Okinawa, Japan.
Sung-Pyo HurJeju Marine Research Center, Korea Institute of Ocean Science and Technology, Jeju, Republic of Korea.
University of the Ryukyus · JPJeju National University · KRKorea Institute of Ocean Science and Technology · KRNational Fisheries Research and Development Institute · KRPukyong National University · KR

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

objectiveAccording to reported spawning characteristics of Japanese eel,

methodsWe examined changes in melatonin-secretion patterns using time-resolved fluorescence immunoassays in sexually immature and mature male Japanese eels under the condition of a new moon (NM) and a full moon (FM).

resultsThe eye and plasma melatonin levels exhibited a nocturnal pattern under a 12-h light: dark cycle (12L12D) or under constant darkness (DD), but not with constant light (LL). Eye melatonin levels were similar under the 12L12D and short-day (9L15D) conditions. In the long-day condition (15L9D), secreted plasma melatonin levels were stable, whereas short-day melatonin secretion began when darkness commenced. Sexual maturation began at 8 weeks following intraperitoneal injection of human chorionic gonadotropin (hCG), and NM exposure led to significantly higher eye and plasma melatonin levels compared with those detected under FM exposure.

Indexed as

Eel migrationJapanese eelMelatoninMoonlightPhotic signalPhotoperiod

Identifiers

PMID34721978
PMCPMC8522646
OpenAlexW3205901863

What OpenQuestion holds

Textmetadata
LicenceCC BY
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.