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 0.3 fish/fisher/day in 2017
- Hinchinbrook ranked 8th in the state for Mangrove Jack Catch Rates in 2017
- Not a target species for commercial catch
Quality of the Fish
- Most of the Mangrove Jack in Estuaries are Juvenile
- The average length reported in Qld Fisheries Boat Ramp Surveys was 393mm
- Hinchinbrook ranked 14th in the State for average length but given the low sample size this is not a reliable measure
- Qld Fisheries Boat Ramp Surveys reported that 61% of fish were released in 2017
- Hinchinbrook ranked 6th in 2017 for the number of fish released
- 79% of the total catch were reported by visitors
Limited Take For Consumption Advised
As this species is primarily a Sports Species, and given the high release rate amongst sport fishers, recommend maximum 1 fish taken in any one session.
- Catch rates for visitors will be similar to 2017 (0.30-0.34 fish/fisher/day)
- Sportsfishers catch rates will also be similar to 2017 (1.2-1.6 fish/fisher/day)
- Most fish will be in the 500-700mm size range
Mangrove Jack as a Sports Species
Mangrove Jack are one of the most commonly targetted by Sportfishers in Hinchinbrook. They are a difficult species to target and represent a signficant challenge. Mangrove Jack are often found in similar habitat to Barramundi.
- Local Sportfishers reported a catch rate of 1.27 fish/fisher/day in 2017
- The most common length reported in 2017 were fish in the 351-400mm size range (14 fish).
- 61% of the total catch in 2017 were undersize with the remainder being legal size fish
A snapshot of local Sportfishers and Suntaggers catch data is available:Local Sportfishers / Suntaggers
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. General Fishers in Hinchinbrook regularly report catching Mangrove Jack each year. Monitoring began in 2017 and is ongoing in 2018.
- 173 Mangrove Jack were reported in the 2017 Qld Fisheries Boat Ramp Surveys
- 2017 Catch Rate of 0.3 fish/fisher/day was reported in 2017
- The average size reported in 2017 was 393mm
- 61% of fish reported in 2017 were released
- The peak periods for catches in 2017 was during January and March
- 79% of the fish reported in 2017 were caught by visitors
Monitoring of Mangrove Jack Recruitment
While the lifecycle of the Mangrove Jack is understood, limited research has been conducted on environmental drivers for recruitment success. Mangrove Jack recruits are detected during Bream Recruitment Surveys indicating they use similar habitat during their growth phase.