Yellowfin tuna

There are six [MSC certified] fisheries in de Pacific Ocean and one certified fishery in the Atlantic Ocean. Yellowfin tuna is often caught together with albacore or skipjack tuna.

Tuna is caught with [handlines and pole lines (mechanised)] or [Purse seines].

There are also multiple pole line and purse seine fisheries in progress towards obtaining MSC certification.

The stockStock:
The fish of a particular species reproducing in the same area in the same period.  level of yellowfin tuna in the western and central Pacific Ocean is low and under the reference level but is not being overfishedOverfished:
A stock is overfished when the stock size has decreased so far that it can no longer produce a maximum sustainable yield. The size of the fish populations is insufficient to reproduce in the long term. . The pole and line fishery is selective with little bycatch and no discards. For this fishery baitfish are caught. The long-term effects of the catching of baitfish are unclear but probably minimal. The fishery does not harm vulnerable [habitats]. The management of pole and line fishery in the western and central Pacific Ocean is partially effective.

The yellowfin tuna stockStock:
The fish of a particular species reproducing in the same area in the same period.  has been heavily overfishedOverfished:
A stock is overfished when the stock size has decreased so far that it can no longer produce a maximum sustainable yield. The size of the fish populations is insufficient to reproduce in the long term.  for the past ten years. The [fishing effort] has now been decreased. The reliability of the [stock assessments] is very uncertain. Measures are needed to effectively control and correct fishing effort. The most recent stock assessment showed that the stock is much smaller than previously assumed. The stock is still being overfishedOverfished:
A stock is overfished when the stock size has decreased so far that it can no longer produce a maximum sustainable yield. The size of the fish populations is insufficient to reproduce in the long term. .

Purse seine fishery that focuses on free swimming schools of tuna is a selective fishery with little bycatch. The fishery doesn’t have negative effects on the seabed or environment in sea.

The IOTCIOTC:
Indian Ocean Tuna Commission, an international organization dedicated to the management of tuna and tuna species in the Indian Ocean and adjacent seas. is responsible for the governance of tuna in the Indian Ocean. There is no [catch limit] established and supervision and control is weak on this fishery. [Illegal fishery] on tuna is a major problem on the Indian Ocean: it is estimated that 18-32% of all tuna yield is illegal. Monitoring and data collection are deficient. Fishery data on catches and bycatches is therefor unreliable and incomplete.

The yellowfin tuna stockStock:
The fish of a particular species reproducing in the same area in the same period.  has been heavily overfishedOverfished:
A stock is overfished when the stock size has decreased so far that it can no longer produce a maximum sustainable yield. The size of the fish populations is insufficient to reproduce in the long term.  for the past ten years. The [fishing effort] has now been decreased. The reliability of the [stock assessments] is very uncertain. Mitigations are needed to effectively control and correct fishing effort. The most recent stock assessment showed that the stock is much smaller than previously assumed. The stock is still being overfishedOverfished:
A stock is overfished when the stock size has decreased so far that it can no longer produce a maximum sustainable yield. The size of the fish populations is insufficient to reproduce in the long term. .

Fishing with [purse seine] with [FADs] has much bycatchBycatch:
Species caught next to species targeted for fishery. By-catches can consist of non-commercial species and species that are too small, and can be kept (this part is sometimes called by-product) or thrown back into the sea (discards).  of young tuna and undesired species like sea turtles, seabirds, rays and sharks. These include vulnerable and endangered species.

The IOTCIOTC:
Indian Ocean Tuna Commission, an international organization dedicated to the management of tuna and tuna species in the Indian Ocean and adjacent seas. is responsible for the management of tuna in the Indian Ocean. There are several problems with the management. There is no [catch limit] set and there are no effective tools to oversee and correct the fishing effort. The [illegal fishery] on yellowfin tuna is still considerable: 18-32% of the total catch. Measures to address unwanted bycatch are not taken. The IOTC has made a resolution to deal with the finning of sharks, but due to the lack of surveillance and control at sea, this initiative has little effect.

The stock of yellowfin tuna has been heavily overfishedOverfished:
A stock is overfished when the stock size has decreased so far that it can no longer produce a maximum sustainable yield. The size of the fish populations is insufficient to reproduce in the long term.  in the last 10 years. The [fishing effort] however has declined and the stock seems to be currently within safe biological limits and is not being overfished. The reliability of the [stock estimate] is however very unclear.

Besides, the catching method of longlines is an unselective fishing method. The longline fishery on yellowfin tuna in the Indian Ocean is known for their high bycatch of young tuna and undesired species like seaturtles, seabirds and sharks. In the north-east of the Indian Ocean, shark bycatches of 54% of the total catch weight have been observed.

The IOTCIOTC:
Indian Ocean Tuna Commission, an international organization dedicated to the management of tuna and tuna species in the Indian Ocean and adjacent seas. is responsible for the management of tuna in the Indian Ocean. There are several problems with the management. There is no [catch limit] set and there are no effective tools to oversee and correct the fishing effort. The [illegal fishery] on yellowfin tuna is still considerable: 18-32% of the total catch. Measures to address unwanted bycatch are not taken. The IOTC has made a resolution to deal with the finning of sharks, but due to the lack of surveillance and control at sea, this initiative has little effect.