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 0.001 fish/fisher/day in 2017
- Rockhampton ranked last (15th) 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 length reported in Qld Fisheries Boat Ramp Surveys 2017 was 500mm
- Rockhampton ranked 2nd 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 the single Mangrove Jack was kept
- Rockhampton ranked last (15th) in 2017 for the number of fish released
Limited Take For Consumption Advised
- Catch rates will likely be down slightly for T20 fishers - 0.2 fish/fisher/day - 0.4 fish/fisher/day
- Mangrove Jack average size will be similar to 2017.
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.
Mangrove Jack as a Sports Species
Mangrove Jack are one of the most commonly targetted by Sportfishers in Rockhampton. 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 0.2 fish/fisher/day in 2017 and have reported a rate0.6 fish/fisher/day in 2018 so far
- The most commonly caught size in 2018 so far, are fish in the 200-250mm size range
A detailed 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 Rockhampton report catching Mangrove Jack in small numbers each year. Monitoring began in 2017 and is ongoing in 2018.
- Only 1 Mangrove Jack was reported in Rockhampton in 2017
- 2017 Catch Rate of 0.001 fish/fisher/day was reported in 2017
- The single fish was 500mm in length
- The single fish was caught by a local and kept
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.
Monitoring of Mangrove Jack
Data for this assessment has been sourced from:
- Bureau of Meterology
- Boyne Tannum Hookup
- Gladstone Sportfishing Club
- Queensland Fisheries
Here are links to all the monitoring pages for Mangrove Jack: