JAPAN. Japan Fisheries Agency , Kasumigaseki, Chiyoda-ku, Tokyo, , Japan. National Research Institute of Far Seas Fisheries, FRA

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1 August, 2018 Report of Japan's scientific observer program for tuna longline fishery in the convention area of Inter-American Tropical Tuna Commission in 2017 calendar year JAPAN Japan Fisheries Agency 1-2-1, Kasumigaseki, Chiyoda-ku, Tokyo, , Japan National Research Institute of Far Seas Fisheries, FRA 5-7-1, Orido, Shimizu, Shizuoka, , Japan Summary In accordance with Resolution C-11-08, Japan commenced its scientific observer program for longline fishery in the convention area of Inter-American Tropical Tuna Commission (IATTC) from 1 January This document provides the scientific observers information in 2017 calendar year. In 2017 calendar year, 17 observer trips were conducted on Japanese tuna longline vessels in the Convention Area. Longline, Japan, Scientific observer, Tuna fisheries Keywords Introduction In accordance with Resolution C-11-08, Japan commenced its scientific observer program for longline fishery in the convention area of Inter-American Tropical Tuna Commission (IATTC) from 1 January This document provides the scientific observers information in 2017 calendar year. Training of the scientific observer In principal, all scientific observers attend a training class held by Overseas Fishery Cooperation Foundation of Japan (OFCF) and Japan NUS (JANUS) under Japan s observer program before their departure for the cruise. The National Research Institute of Far Seas Fisheries (NRIFSF) provides an observer manual and supervises the training course. Under the course scientific observers are trained in skills necessary for conduct its part, including species identification, data recording protocols etc. Results 1

2 i) Observer trip number, observed fishing operations and observer coverage In 2017 calendar year, 17 observer trips were conducted on Japanese tuna longline vessels. Total number of observed fishing operations of the 17 trips was 920 sets. Information on the 17 trips are shown in Table 1. The tentative observer coverage rate was calculated to be 8.6% (920/10,746). ii) Catch records, including bycatch data Observers recorded every items taken on deck and identified the species by themselves. Observers also collected bycatch data. They took photo of bycatch species according to the procedures given in the observer manual made by NRIFSF scientists. Bycatch experts in NRIFSF identified species using these photos. Species information from Trips 1-5, 8-9 and whose data have already been checked are available at this stage. The list of species from these trips was shown in Table 2. In relation to paragraph 3 of Resolution C-11-10, fifty-two interactions of oceanic whitetip shark were recorded by observers in 5 trips (Table 2). Twenty-five whitetip sharks were dead discarded and others were released alive. In relation to paragraph 4 of Resolution C-15-04, fifteen interactions of mobulid ray were recorded by observers in 4 trips (Table 2). In relation to paragraph 4.a of Resolution C-04-05, eleven interactions of sea turtles were recorded by observers in 4 trips (Table 2), and all of them were released. 2

3 Table 1. Information on the trip of the scientific observer for Japanese tuna longline in the convention areas of Inter-American Tropical Tuna Commission during 2017 calendar year. Trip ID Range of latitude Range of longitude Start date of operation End date of operation Number of operation Number of hooks Trip S W 2017/1/1 2017/1/ ,200 Trip S W 2017/1/1 2017/1/ ,440 Trip S W 2017/2/4 2017/4/ ,520 Trip 4 3.1N-8.8S W 2017/4/4 2017/5/ ,310 Trip S W 2017/6/ /9/ ,800 Trip 6 5.8N-18.7S W 2017/7/ /9/ ,775 Trip S W 2017/6/ /8/ ,644 Trip S W 2017/7/ /10/ ,500 Trip S W 2017/7/ /11/ ,920 Trip S W 2017/8/ /9/ ,469 Trip S W 2017/9/1 2017/12/ ,005 Trip S W 2017/10/ /12/ ,617 Trip S W 2017/10/8 2017/12/ ,120 Trip S W 2017/12/3 2017/12/ ,510 Trip S W 2017/10/5 2017/12/ ,400 Trip S W 2017/12/ /12/ ,420 Trip S W 2017/11/ /12/ ,410 Total ,479,060 3

4 Table 2. List of species recorded by scientific observer on longline fishery in the Convention Area in 2017 calendar year (Unit: Number of individuals). Trip Species Albacore Yellowfin tuna Bigeye tuna Skipjack tuna Sailfish Black marlin Blue marlin Spearfishes Striped marlin Sword fish Other teleosts Thresher sharks Shortfin mako Blue shark Oceanic whitetip shark Other Sharks Sting ray Mobulid Rays Other Rays Sea Birds Sea Turtles Mammals Unidentified Total Total 4

5 Fig 1. Line setting locations of Japanese tuna longline for the trips with the scientific observer onboard in the convention areas of Inter-American Tropical Tuna Commission during 2017 calendar year (Trip 1 to 13). 5

6 Fig 1. Continued. 6

7 Fig 1. Continued. 7

8 Acknowledgement We greatly appreciate all scientific observers for their efforts in order to collect valuable data and samples on the Japanese longline vessels. We would also like to express special thanks to all crews of the longline vessels for their understanding and cooperation to the observer program. 8

9 INTER-AMERICAN TROPICAL TUNA COMMISSION SCIENTIFIC ADVISORY COMMITTEE NINTH MEETING La Jolla, California (USA) May 2017 DOCUMENT SAC-09 INF A(i ) Report of Japan's scientific observer program for tuna longline fishery in the convention area of Inter-American Tropical Tuna Commission in 2016 calendar year JAPAN Japan Fisheries Agency 1-2-1, Kasumigaseki, Chiyoda-ku, Tokyo, , Japan National Research Institute of Far Seas Fisheries, FRA 5-7-1, Orido, Shimizu, Shizuoka, , Japan Summary In accordance with Resolution C-11-08, Japan commenced its scientific observer program for longline fishery in the convention area of Inter-American Tropical Tuna Commission (IATTC) from 1 January This document provides the scientific observers information in 2016 calendar year. In 2016 calendar year, 13 observer trips were conducted on Japanese tuna longline vessels in the Convention Area. Longline, Japan, Scientific observer, Tuna fisheries Keywords Introduction In accordance with Resolution C-11-08, Japan commenced its scientific observer program for longline fishery in the convention area of Inter-American Tropical Tuna Commission (IATTC) from 1 January This document provides the scientific observers information in 2016 calendar year. Training of the scientific observer In principal, all scientific observers attend a training class held by Overseas Fishery Cooperation Foundation of Japan (OFCF) and Japan NUS (JANUS) under Japan s observer program before their departure 1

10 for the cruise. The National Research Institute of Far Seas Fisheries (NRIFSF) provides an observer manual and supervises the training course. Under the course scientific observers are trained in skills necessary for conduct its part, including species identification, data recording protocols etc. Results i) Observer trip number, observed fishing operations and observer coverage In 2016 calendar year, 13 observer trips were conducted on Japanese tuna longline vessels. Total number of observed fishing operations of 13 trips was 831 sets. Information of the trips is shown in Table 1. The observer coverage rate was calculated to be 7.18% by number of operations (831/11,572). ii) Catch records, including bycatch data Observers recorded every items taken on deck and identified the species by themselves. Observers also collected bycatch data. They took photo of bycatch species according to the procedures given in the observer manual made by NRIFSF scientists. Bycatch experts in NRIFSF identified species using these photos. The list of species recorded by scientific observer on longline fishery in 2016 was shown in Table 2. In relation to paragraph 3 of Resolution C-11-10, sixteen interactions of oceanic whitetip shark were recorded by observers in 7 trips (Table 2). Seven oceanic whitetip sharks were dead discarded and others were released alive. In relation to paragraph 4 of Resolution C-15-04, eighteen interactions of Mobulid ray were recorded by observers in 5 trips (Table 2). In relation to paragraph 4.a of Resolution C-04-05, sixty-seven interactions of Sea turtles were recorded by observers in 6 trips (Table 2), and all of them were released. 2

11 Table 1. Information on the trip of the scientific observer for Japanese tuna longline in the convention areas of Inter-American Tropical Tuna Commission during 2016 calendar year. Trip ID Range of latitude Range of longitude Start date of operation End date of operation Number of operation Number of hooks Trip S W 2016/1/1 2016/1/3 3 8,010 Trip S W 2016/1/1 2016/2/ ,974 Trip S W 2016/1/1 2016/4/ ,976 Trip S W 2016/5/2 2016/11/ ,027 Trip S W 2016/7/ /10/ ,466 Trip S W 2016/8/8 2016/10/ ,840 Trip S W 2016/8/ /10/ ,389 Trip S W 2016/8/5 2016/11/ ,800 Trip S W 2016/9/ /10/ ,080 Trip S W 2016/9/4 2016/9/ ,832 Trip S W 2016/10/ /10/ ,150 Trip S W 2016/9/ /12/ ,500 Trip S W 2016/10/ /12/ ,920 Total ,156,522 3

12 Table 2. List of species recorded by scientific observer on longline fishery in the Convention Area in 2016 calendar year (Unit: Number of individuals). Trip Species Albacore Yellowfin tuna Bigeye tuna Skipjack tuna Sailfish Black marlin Blue marlin Spearfishes Striped marlin Sword fish Other teleosts Thresher sharks Shortfin mako Blue shark Oceanic whitetip shark Other Sharks Sting ray Mobulid Raya Other Rays Sea Birds Sea Turtles Mammals Unidentified Total

13 Table 2. Continued. Trip Total Species Albacore Yellowfin tuna Bigeye tuna Skipjack tuna Sailfish Black marlin Blue marlin Spearfishes Striped marlin Sword fish Other teleosts Thresher sharks Shortfin mako Blue shark Oceanic whitetip shark Other Sharks Sting ray Mobulid Raya Other Rays Sea Birds Sea Turtles Mammals Unidentified Total

14 Fig 1. Line setting locations of Japanese tuna longline for the trips with the scientific observer onboard in the convention areas of Inter-American Tropical Tuna Commission during 2016 calendar year (Trip 1 to 13). 6

15 Fig 1. Continued. 7

16 Fig 1. Continued. 8

17 Fig 1. Continued. 9

18 Acknowledgement We greatly appreciate all scientific observers for their efforts in order to collect valuable data and samples on the Japanese longline vessels. We would also like to express special thanks to all crews of the longline vessels for their understanding and cooperation to the observer program. 10

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