Nekogigi  (Pseudobagrus ichikawai)

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This species information was authored as part of the ARKive and Universities Scheme.

• Adipose fin: in some fish, a second dorsal fin consisting of a flap of fatty tissue, which lacks supporting rays.
• Anal fin: in fish, an unpaired fin on the under surface of the fish, behind the anus.
• Barbels: fleshy projections near the mouth of some aquatic vertebrates.
• Crustaceans: diverse group of animals with jointed limbs and a hard external skeleton, characterised by the possession of two pairs of antennae, one pair of mandibles (mouthparts used for handling and processing food) and two pairs of maxillae (appendages used in eating, which are located behind the mandibles). Includes crabs, lobsters, shrimps, woodlice and barnacles.
• Dorsal fin: the unpaired fin found on the back of the body of fish, or the raised structure on the back of most cetaceans (whales, dolphins and porpoises).
• Endemic: a species or taxonomic group that is only found in one particular country or geographic area.
• Fertilisation: the fusion of gametes (male and female reproductive cells) to produce an embryo, which grows into a new individual.
• Larval: of the stage in an animal’s lifecycle after it hatches from the egg. Larvae are typically very different in appearance to adults; they are able to feed and move around but usually are unable to reproduce.
• Nocturnal: active at night.
• Order: a category used in taxonomy, which is below ‘class’ and above ‘family’. All members of an order have characteristics in common.
• Oviparous: an animal that reproduces by laying eggs, which hatch outside the mother’s body.
• Pectoral fin: in fish, the pair of fins that are found on either side of the body just behind the gills. They are generally used for balancing and braking.
• Plankton: aquatic organisms, usually tiny, that drift passively with water movements; includes phytoplankton (plants), zooplankton (animals), or other organisms such as bacteria.

1. IUCN Red List (November, 2010)
   http://www.iucnredlist.org/
2. FishBase - Nekogigi Pseudobagrus ichikawai (November, 2010)
   http://www.fishbase.org/
3. Watanabe, K. (1998) Meristic variation in the endangered bagrid catfish. Pseudobagrus ichikawai. Ichthyological Research, 45(1):99-104.
4. Watanabe, K. (2009) Sudden crash of a local population of the endangered bagrid catfish Pseudobagrus ichikawai. Icthylogical Research, 56(3): 219-321.
5. Okada, Y. and Kubota, S. (1957) Description of a new fresh water cat-fish Coreobagrus ichikawai, with an emendation of the genus Coreobagrus Mori. Japanese Journal of Ichthyology, 5:143-145.
6. Hildyard, A. (2001) Endangered Wildlife and Plants of the World. Marshal Cavendish Corporation, New York.
7. Watanabe, K., Mori, S., Nagoshi, M., Jeon, S. and Shimizu, Y. (1992) Morphological differences between two bagrid catfishes, Coreobagrus ichikawai and C. brevicorpus. Ichthyological Research, 39(2): 157-162.
8. Nelson, J.S. (2006) Fishes of the World Fourth Edition. John Wiley & Sons, New Jersey.
9. Watanabe, K. (2008) Diel activity and reproductive territory of the Japanese bagrid catfish, Pseudobagrus ichikawai. Environmental Biology of Fishes, 81(1): 77-86.
10. Watanabe, K. (1994) Mating behaviour and larval development of Pseudobagrus ichikawai (Siluriformes: Bagridae). Ichthylogical Research, 41(3): 243-251.