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数据来源   
The collection of the various catch statistics for tuna species has been carried out by various tuna fishery bodies and other regional international organizations for specific species and areas. Such statistics were provided to the Fisheries and Aquaculture Resources Use and Conservation Division (FIR) of FAO's Fisheries Department (FI) for the purpose of preparing this nominal catches database.

The Food and Agriculture Organization of the United Nations (FAO) and the Marine and Inland Fisheries Service of its Fisheries Department and, in particular, the authors of this presentation are grateful for this collaboration.

The following institutions provided their data on tuna catches:

Commission for the Conservation of Southern Bluefin Tuna - CCSBT
Indian Ocean Tuna Commission - IOTC
Interim Scientific Committee for Tuna and Tuna-like Species in the North Pacific Ocean - ISC
International Commission for the Conservation of Atlantic Tunas - ICCAT
Inter-American Tropical Tuna Commission - IATTC
Secretariat of the Pacific Community - SPC

The authors would like to thank especially Robert Kennedy (CCSBT), Miguel Herrera (IOTC), Michael G. Hinton (IATTC), Papa Kebe and Carlos Palma (ICCAT), Timothy Lawson (SPC) and Yuji Uozumi (ISC) for the preparation and provision of nominal catch data.

We also appreciate the assistance provided by FAO's Statistics and Information Service (FIPS), particularly by Fabrizio Sibeni and Francesco Calderini.

质量保障   
Accuracy
Original sources of nominal catch data obtained by FAO's Fisheries and Aquaculture Resources Use and Conservation Division (FIR) from tuna fishery bodies and other regional international organizations are not necessarily official national statistics, however data provided by these tuna fishery bodies and other regional international organizations are regarded as most representative. Please see the respective Web site of each institution.

Presentation of data
The global tuna nominal catches data can be queried through a Web-based interface from which the user can select each item measured in the dataset and display it either as a table or as a chart. Furthermore, the user can also download the result of its query.

The first step is to select one or more items under each of the main four selection tabs of the Query Panel: stocks, gears, fishing countries and years. Then the user can select the type of aggregation or details to display and send the query. The resulting table can be either exported or displayed as a graph.

Consistency
数据收集方法:  Collection of catch statistics for tuna species is carried out by tuna fishery bodies and other regional international organizations and is then reported to FAO. Every institution has its specific way of reporting data. Disparities in the way data were provided is due to variations within file types (e.g. Excel, dBase, Access) as well as the use of different codes.

The stocks for which nominal catches were received by each institution are listed below:
  1. CCSBT: Southern bluefin.
  2. IOTC: Indian Ocean albacore, Indian Ocean bigeye, Indian Ocean skipjack and Indian Ocean yellowfin;
  3. IATTC: Pacific bigeye, eastern Pacific skipjack and eastern Pacific yellowfin;
  4. ICCAT: North Atlantic albacore, South Atlantic albacore, Mediterranean albacore, Atlantic bigeye, eastern Atlantic bluefin, western Atlantic bluefin, eastern Atlantic skipjack, western Atlantic skipjack and Atlantic yellowfin;
  5. ISC: North Pacific albacore and Pacific bluefin;
  6. SPC: South Pacific albacore, Pacific bigeye, western and central Pacific bigey, western and central Pacific skipjack, western and central Pacific yellowfin.
The fishing gear codes used by the different institutions are shown as follows:

Commission for the Conservation of Southern Bluefin Tuna (CCSBT)

CCSBT's codeExplanationCode of major fishing gear
BB Baitboat PL
GILLGillnet OTHER
HAND Handline OTHER
LL Longline LL
PS Purse seine PS
SURF * Surface gearsSURF
TROL Troll lineTROLL
UNCL Unclassified OTHER
* Surface gears include mainly purse seine and pole and line. CCSBT only started to disaggregate pole and line and purse seine catches after 1974.

Indian Ocean Tuna Commission (IOTC)

IOTC's gear nameCode of major fishing gear
BaitboatPL
GillnetOTHER
Handline OTHER
Longline LL
Purse seine PS
Troll line TROLL
UnclassifiedOTHER

International Commission for the Conservation of the Atlantic Tuna (ICCAT)

ICCAT's code Explanation Code of major fishing gear
BB Baitboat PL
BBF Baitboat with freezers PL
BBI Baitboat with ice-wells PL
BLL Bottom or deep longline LL
GILL Gillnet OTHER
HAND Handline OTHER
HARP Harpoon OTHER
HS Haul seine OTHER
LL Longline LL
LLFB Foreign-based longline LL
LLHB Home-based longline LL
LLMB Longline with mother boat LL
MWT Mid-water trawl (pelagic) OTHER
MWTD Mid-water paired trawl OTHER
PS Purse seine PS
PSD Double-boat purse seine PS
PSFB Purse seine catching large fish PS
PSFS Purse seine catching small fish PS
PSG Large purse seine PS
PSLB Purse seine using live bait PS
PSM Medium purse seine PS
PSS Small purse seine PS
RR Rod-and-reel OTHER
RRFB Rod-and-reel catching small fish OTHER
RRFS Rod-and-reel catching small fish OTHER
SPHL Sport fishing using hand line OTHER
SPOR Recreational fisheries (mostly rod and reel) OTHER
SURF Surface fisheries unclassified OTHER
TL Tended line OTHER
TRAP Trap OTHER
TRAW Trawl OTHER
TROL Troll TROLL
UNCL Unclassified (gears not reported) OTHER

Inter-American Tropical Tuna Commission (IATTC)

IATTC's code Explanation Code of major fishing gear
FXUnknown OTHER
LL Longline LL
LPBaitboat PL
PSPurse seine PS
TrollTroll line TROLL

Secretariat of the Pacific Community (SPC)

SPC's code Explanation Code of major fishing gear
G Gillnet OTHER
H Handline OTHER
L Longline LL
O Unclassified (gears not reported) OTHER
P Pole and line PL
R Ring net OTHER
S Purse seine PS
T Troll TROLL
数据处理方法: For each institution, which provided the data, one single computer file was created using the following codes:
  1. acronym of the institution providing the data
  2. name of the ocean or sea
  3. fishing gear
  4. species
  5. stock
  6. fishing nation (FAO short name)
  7. year
 
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