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Tokyo Bay Sharks
Deep water fauna

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A research on deep water sharks in Tokyo Bay was carried out from October, 2009 to November, 2011. Sharks taken by bottom gill net from the upper part of the mesopelagic zone in Tokyo Bay were 14 genera, 22 species, 116 in number. During this period, shallow water sharks, 4 genera, 4 speciea, 6 in number in Tokyo Bay were also taken by the bottom gill net placed at depth of 50-150 m.

Table 1. A list of sharks taken from the slope of the Tokyo canion
species Japanese name TL (cm), male TL (cm), female number of specimens
1 Apristurus platyrhynchus Herazame 61,64,65,67 60,65,66,66,66,67,67,67,68,69 15
2 Centrophorus acus Tarozame 47 52 2
3 C. atromarginatus Aizame 119 130 2
4 C. squamosus Momijizame 99,135 2
5 C. tessellatus Genrokuzame 113 1
6 Cephaloscyllium umbratile Nanukazame 32 42 1
7 Chlamydoselachus anguineus Labuka 122,128,129,132,135,136 108,128,135,151 10
8 Dalatias licha Yoroizame 37,37,44,46,55,63 42,47,55,63,67,88,97,151,155 15
9 Deania calcea Hera-tunozame 33,34,36,69,70,70,71,71,72 37,37,105,108,110,111,112,115,115,120,120 20
10 D. histricosa Sagamizame 88,35 34,37 4
11 Etomoptelus molleri Hiretakafujikujira 25.5 27,37 3
12 Etomoptelus sp 1 35.5 1
13 Etomoptelus sp 2 26 1
14 Etomoptelus sp 3 36.5 1
15 Galeus eastmani Yamorizame 45 52,55 3
16 Galeus nipponensis Nihonyamorizame 57 1
17 Heptranchias perlo Edo-aburazame 62,75,86,93,98,108,113 7
18 Mitsukurina owstoni Mitsukurina 92,99,100,110,121,127 119,120 8
19 Odontaspis ferox Owani 122 1
20 Scyliorhinus torazame Torazame 39,40 3
21 Squalus mitsukurii Futo-tunozame 66,70 58,66,80,84,90,98,90,105,108,110,110 13
22 Squalus sp. Hiretaka-tunozame 40.5 1
total number 116
Chimaera fantasm >50

Table 2. Shallow water fauna of Tokyo Bay
species Japanese name TL (cm), male TL (cm), female number of specimens
23 Musterus manazo Hoshizame 78 1
24 Pristiophorus japonica Nokogirizame 107,107 2
25 Squatina japonica Kasuzame 49 1
26 Triakis scyllium Dochizame 65 1


Ref.
Blainville's Dogfish, Squalus blainville, from Japan, with Notes on S. mitsukurii and S. japonicus. Chetsung Chen, Toru Taniuchi and Yukio Nose. Japanese Journal of Ichthyology Vol. 26, No. 1
Fauna and zoogeography of deep-benthic chondrichthyan fishes around the Japanese Archipelago. Kazuhiro Nakaya and Shigeru Shira. Ichthyological Research, Vol. 39, No. 1, 37-48
Taxonomy, Comparative anatomy and Phylogeny of Japanese Catsharks, Scyliorhinidae. Kazuhiro Nakaya, Memories of the Faculty of Fisheries Hokkaido University, Vol. 23, No. 1, 1-94



20111227 Fumio Nakagawa@

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