|
| Marine Resource Fact Sheet |
| |
| | Swordfish - Indian Ocean, 2006 |
| |  |
| | Owned by | Indian Ocean Tuna Commission (IOTC)
more>> |
|
|
| Main Descriptors | Considered a single stock: Yes
Spatial Scale: Regional
Considered a management unit: Yes |
| Considered a single stock: A group of individuals in a species occupying a well defined spatial range independent of other stocks of the same species. It can be affected by random dispersal movements and directed migrations due to seasonal or reproductive activity. |
| Spatial Scale: Spatial scale contains a standard term such as Global, Regional (e.g. for the whole Atlantic), sub-regional (e.g. for a part of the Atlantic), national, local (for sub-national levels). |
| Considered a management unit: An aquatic resource or fishery is
declared as [Fishery] Management Unit if it is
effectively the focus for the application of selected
management methods and measures, within the broader
framework of a management system. According to the FAO
Glossary for Responsible Fishing, "a Fishery Management
Unit (FMU) is a fishery or a portion of a fishery
identified in a Fishery Management Plan (FMP) relevant
to the FMP's management objectives." FMU's may be
organised around fisheries biological, geographic,
economic, technical, social or ecological dimensions ,
and the makeup and attribute of a fishery management
unit depends mainly on the FMP's management
objectives. |
| Jurisdictional distribution: Jurisdictional qualifier (e.g.
"shared", "shared - highly migratory") of the aquatic
resource related with its spatial distribution. |
| Environmental group: Classification of the aquatic
resource according to the environmental group (e.g.
pelagic invertebrate, or demersal fish) to which the
species belong. |
| | | | | | Habitat and Biology Climatic zone: Tropical Bottom type: Unspecified Depth zone: Unspecified Horizontal distribution: Oceanic Vertical distribution: Pelagic Geographical Distribution Jurisdictional distribution: Highly migratory Geo References  | | Distribution of Swordfish - Indian Ocean
| iotc Comp | IOTC: IOTC competence area |
| | | | | | Other georeferences
| FAO major areas | 51: Indian Ocean, Western | | 57: Indian Ocean, Eastern |
| | | | | | Intersecting Major FAO areas and LME areas |
The following area codes have been found as intersecting the distribution of Swordfish - Indian Ocean | FAO major areas | 51:
Indian Ocean, Western | | 57:
Indian Ocean, Eastern | | (LME) Large Marine Ecosystem Areas | 30: Agulhas Current | | 31: Somali Coastal Current | | 32: Arabian Sea | | 33: Red Sea | | 34: Bay of Bengal | | 39: North Australian Shelf | | 42: Southeast Australian Shelf | | 43: Southwest Australian Shelf | | 44: West-Central Australian Shelf | | 45: Northwest Australian Shelf |
Resource Structure Considered a single stock: Yes Assessment The stock assessment was undertaken in 2006 using data up to 2004 Management Considered a management unit: Yes Biological State and Trend Exploitation rate: Fcurrent/ FMSY > 1 Exploitation state: Fully exploited
Abundance level: Bcurrent/ BMSY > 1 Notwithstanding the uncertainties in the 2006 assessments using surplus production models, the overall results
were consistent, particularly in terms of the current levels of fishing mortality and stock biomass levels. Stock
biomass decreased markedly from the early 1990s corresponding to a sharp increase in fishing mortality. Based on
the point estimates and confidence limits, on balance the assessment model results indicate that there is probable
overfishing of the swordfish stock in Indian Ocean in recent years (Fcurrent/ FMSY > 1) while the stock currently
appears not to be in an overfished state (Bcurrent/ BMSY > 1). The current catch level (around 31,500 t) is above
the MSY and probably not sustainable. Source of information “Report of the Fifth Session of the IOTC Working Party on Billfish” IOTC WPB 2006 IOTC-2006-WPB-R{EN+FR] IOTC. |
|
| |
|
Map legend