Medaka Hyakka — Issue 01 (2012 inaugural)
Original English research and explanatory guide, not a full magazine translation.
AQUAPEDIA / PUBLICATION RESEARCH
Magazines & Articles.
English reading companions for Japanese medaka and shrimp research. Browse completed English research notes with page references, original publication links, and clear provenance; protected issue scans are not reproduced.
Official association reference · 2025
JMA Classification Manual, 5th edition
18 detailed English research explanations drawn from the source topics, including the final classification questions. Original fish artwork remains with JMA.
Magazine · December 2025
Medaka Hyakka No. 21
Six expanded English research guides covering Savanna, Musou show awards, Kikucha Medaka and Lightning. Each points to exact flipbook pages.
Original Aquapedia editorial
JMA: The Classification Era
An original English editorial feature explaining the association’s 2025 classification direction; not an official translation.
English reading library
Find all 21 English reading pages in one place, including the three translated excerpts, 10 issue guides and eight original research companions.
English research by issue or article
Open the specific English page below. Each page identifies the original publisher, its source and whether it is a reading guide or a translated excerpt.
Medaka Hyakka — Issue 02 | Early Aurora & Lame
Original English research and explanatory guide, not a full magazine translation.
Medaka Hyakka — Issue 03 | Black-Rim Origins
Original English research and explanatory guide, not a full magazine translation.
Medaka Hyakka — Issue 04 | Tricolor History
Original English research and explanatory guide, not a full magazine translation.
Medaka Hyakka — Issue 05 | Orochi & Black Diamond
Original English research and explanatory guide, not a full magazine translation.
Shrimp Club — No. 01 (2011) | Red Bee Foundations
Original English research and explanatory guide, not a full magazine translation.
Medaka Trip — Vol. 01 (2025–26) | Wazumi
Original English research and explanatory guide, not a full magazine translation.
Medaka Advance — Vol. 01 | Long-Fin Types
Original English research and explanatory guide, not a full magazine translation.
Medaka Advance — Vol. 02 | Daruma Medaka
Original English research and explanatory guide, not a full magazine translation.
Medaka Advance — Vol. 03 | Kagami Mirror Scales
Original English research and explanatory guide, not a full magazine translation.
Licensed Translation 01 | Medaka & Wild Genetic Disturbance
Translated selected Japanese passages only, not a full article translation.
Licensed Translation 02 | Wild Minami-Medaka in Kagawa Pond Survey
Translated selected Japanese passages only, not a full article translation.
Licensed Translation 03 | Northern Medaka in Nagano Pond Survey
Translated selected Japanese passages only, not a full article translation.
Rights and translation status. These are original English summaries, not full translations or images from the source. Earlier page-matched English PDF adaptations remain private review materials pending written republication and adaptation permission. Names, awards and crosses are attributed to the original source and may require independent confirmation.
New English research articles
Eight individually sourced, original English research companions. These are not complete translated reprints of copyrighted journals or the JMA manual.
Palaemon sinensis in Japan: new prefectural records
Fujii and Fuke reported the freshwater prawn Palaemon sinensis from three prefectures of Japan, with Yamanashi and Fukui described as first prefectural records. Such locality evidence is useful for shrimp identification and invasive-range mapping, but it does not independently demonstrate displacement of native species or aquarium compatibility.
What medaka larval starvation research reveals about liver metabolism
In a controlled medaka larval experiment, starvation without supplemental glucose produced fatty-liver signs in 3%, 35% and 61% of larvae at four, seven and nine days after hatching. Proteomic results indicated altered amino-acid catabolism, fatty-acid beta-oxidation and lipid transport. The glucose comparator was an experimental control, not a recommended aquarium feed.
Treated wastewater and medaka fertilization: an experimental study
The investigators exposed medaka to treated wastewater and analyzed growth, spawning and potential water-quality/metabolic markers. Their Japanese abstract reports fewer fertilized eggs and reduced fertilization rates in the secondary-treated-water group. Associations with analytical markers do not establish which individual chemical caused the reproductive differences.
Which plants do wild medaka deposit eggs on in rice paddies?
Researchers studying naturally reproducing medaka in one rice paddy observed eggs deposited on Chara braunii, Trapa jeholensis and Spirogyra sp., but not on rice stalks or Monochoria vaginalis. The result highlights the ecological role of noncrop aquatic vegetation; it does not rank aquarium spawning mops.
Morning courtship and later egg deposition in wild medaka
An outdoor-pond study documented medaka courtship and spawning in the morning. Females then carried fertilized eggs before depositing them on surface-adjacent aquatic vegetation through the morning and afternoon. Timing varies with context, so the study is a husbandry research lead, not a strict ornamental breeding rule.
Invasive Neocaridina and freshwater-shrimp conservation in Japan
Nagai and Imai published a study of how introductions of nonnative Neocaridina relate to changes in Japanese land-locked freshwater-shrimp fauna. The publication's title and scope are verified; detailed species, genetic and site-specific conclusions await a full-text audit. Ornamental trade names are not scientific identifications.
Marker-assisted congenic medaka in about four generations
Researchers combined markers, genotyping and cryopreserved sperm resources to develop congenic medaka strains with HNI-II genetic regions on an HdrR-II1 background in roughly four generations. This scientific method should not be mistaken for proof of pedigrees for ornamental Kagami, Ryurin or Dragon Scale trade lines.
JMA classification manual — independent English guide
Explore how the Japan Medaka Association separates trait-based descriptions from trade names, breeder lines and unsupported genetic ancestry, with practical identification pointers.
EXPANDED ENGLISH MEDAKA REFERENCE
Explore the full classification field guide
13 new studies, 63 Japanese terms and 54 practical identification questions. Independently written and linked to the official 2025 Japanese source.