Crystal Bowl GBR is aiming to examine 3 core measures across a wide range of species in the region:
- Fishing experience (how many fish per trip)
- Quality of the fish (size of fish)
- Community attitudes (number of legal size fish kept or released)
- Qld Fisheries Boat Ramp Surveys reported a catch rate of 0.2 fish/fisher/day
- Rockhampton ranked 4th in the state for King Threadfin Catch Rates
- Sportfishers reported an increase in catch rate from 1 fish/fisher/day in 2017 to 1.3 fish/fisher/day in 2018, so far
Quality of the Fish
- 2017 Qld Fisheries Boat Ramp Surveys reported an average length of 742mm in 2017
- Rockhampton ranked 3rd in the State for size of King Threadfin (based on Qld Fisheries Boat Ramp Surveys - based on min 100 fish reported)
- 65% of legal size fish reported by recreational fishers in the Qld Fisheries Boat Ramp Surveys were kept
- 53% of reported fish were caught by visitors
- Rockhampton ranked 10th across the state for the number of fish released
Moderate Take For Consumption Advised
- Boyne Tannum hookup catch rate between 1.2 and 1.6 fish/fisher/day
- 95% of Yellowfin Bream in the Boyne Tannum Hookup will be between 270 and 290mm
- Recruitment is likely to be moderate
Heavy harvesting of Bream is not recommended, but a moderate take for consumption is unlikely to adversely affect stocks based on available data. Evidence from the Qld Fisheries boat ramp surveys suggests that most fish are released but with only a single year of data, this will need to be assessed as additional data is collected.
NOTE: Moderate take means taking what is required for immediate needs.
Qld FIsheries Boat Ramp Surveys - General Fishers
Monitoring of Recreational Catch by Qld Fisheries
Queensland Fisheries monitors boat ramps up and down the coast as a part of the Sustainable Fisheries Strategy. Fishers in Rockhampton regularly report catching King Threadfin with most being released. Monitoring began in 2017 and continues in 2018.
- King Threadfin were the 7th most commonly reported species in Rockhampton in 2017
- An average size of 742mm was reported by fishers in 2017
- Fishers reported a catch rate of 0.2 fish/fisher/day in 2017
- 65% of fish reported in 2017 were kept
- 53% of fish reported were caught by visitors
- Peak periods for King Threadfin catches in 2017 were during January and August
King Threadfin as a Sports Species
King Threadfin are a prized sports species in most locations across Queensland. In Rockhampton, King Threadfin are targeted by Sportfishers and tagged and reported on most occasions.
- A catch rate of 1.37 fish/fisher/day has been reported forKing Threadfin in 2018, so far
- The most commonly caught size reported so far in 2018 are fish in the 801-900mm size range (15 fish) followed by fish in the 701-800 size range (14 fish)
- 78% of the total 2018 catch were legal size fish
A detailed snapshot of Sportsfishers and Suntaggers catch data is available:
Commercial Fishing Catch
Queensland Fisheries monitors commercial catches up and down the coast. Commercial fishers are required to maintain logbooks of catch and report quarterly. Data for the commercial catch of King Threadfin in Rockhampton ends in 2016 before the establishment of the net free zone at the mouth of the Fitzroy River (refer to Fishing Area section).Rockhampton King Threadfin Commercial Catch Dashboard
Importance of King Threadfin to Tourism
Bream are not specifically a tourism drawcard but along with Whiting and Flathead, they are an important species for any family visitors. Family visitors are more likely to target species that are easier to locate in a short space of time.
Monitoring of King Threadfin Recruitment
Recruitment is the success rate of juvenile fish surviving past the larval state. Bream Recruitment is monitored by the Gladstone Healthy Harbours Partnership. An extract of the current assessment is included below. A report on the development of the report card is available on the crystal-bowl website Report on development of Bream Report Card.For full details visit the Report Card website :http://ghhp.org.au/report-cards/2017/environmental.
Recruitment plays a key role in a fishery population, and the size distribution of fish gives an indication of bream successfully reaching and surpassing the juvenile stage.
There are no external criteria available to set baseline levels for fish recruitment therefore the scores were constructed with respect to internal criteria, derived objectively from the data itself.
A score of 0.50 equates to a year (season) at the median reference level, indicating no increase or decrease in the catch rate from the long term average. The 2017 score of 0.71 (B) for fish recruitment means that there is an increased catch rate relative to the median reference level. In other words, the model identified that the 2016-2017 season had a higher bream recruitment rate after correcting for a number of important environmental and temporal variables.
Note that variation in juvenile bream catch between years may be partly due to natural population cycles so care should be taken in interpreting results.
The overall harbour grade for the 2016-17 season was a B, which indicates good bream recruitment. This is a marked improvement relative to the 2015-16 season. All zones showed increased recruitment with only three zones reflecting poor-satisfactory recruitment (Graham creek, Boat Creek, Inner Harbour).
Monitoring of King Threadfin
Data for this assessment has been sourced from:
- Bureau of Meteorology
- Queensland Fisheries
- Local Sportfishers and Suntaggers
Here are links to all the monitoring pages for King Threadfin: