Bigeye Tuna, Indian Ocean, Troll/pole and line

Thunnus obesus
Content last updated
19 August 2019
Stock
Indian Ocean
Management
Indian Ocean Tuna Commission
Stock Status
1 of 5
Very low risk
Management
3 of 5
Moderate risk
Bycatch
2 of 5
Low risk
Habitat
1 of 5
Very low risk

Stock status

1 of 5
Very low risk

Indian Ocean bigeye tuna has been scored a very low risk. This is because the stock biomass is well above levels necessary to produce the maximum sustainable yield and fishing mortality rates are sustainable.

Management

3 of 5
Moderate risk

The management of the bigeye tuna Indian Ocean fishery is a moderate risk. There are some management measures in place and the Indian Ocean Tuna Commission (IOTC) has taken measures to improve monitoring of vessels fishing in the IOTC are of competence, but compliance with these measures continues to be an issue for some countries. The IOTC has not adopted formal reference points or harvest control rules for this species.

Bycatch

2 of 5
Low risk

The bycatch in the bigeye tuna Indian Ocean troll and pole and line fisheries has been scored a low risk. Bycatch and discards in troll and pole and line fisheries typically makes up a small proportion of the total catch (Kellher 2005). Baitfish are typically used in troll and pole fisheries. The ratio of tuna to baitfish is around 30:1 and in most cases baitfishing makes up a small proportion of the total fishing mortality for baitfish species (Gillet 2012).

Habitat

1 of 5
Very low risk

The habitat impact of the bigeye tuna Indian Ocean pelagic troll and pole and line fishery has been scored as low impact. This is because there is the potential for hooks to contact bottom habitats. Although in tuna fisheries, which target fish in open waters, this is a very minor concern.