Seasonal closure and minimum legal size for barramundi in the Gulf ...

Table A2 Barramundi model input parameters and settings
Biology Functions/settings References/data sources Figures
Commercial selectivity (S com ) l
k 2
1m
Scom
exp
2
2km
2
(Hyland 2007) Figure 12
k 5.203, k 0.619, m177.8 (mesh size for 7'' net)
Recreational selectivity (S rec )
Retainability (H)
1 2
Linear increase between 440 mm and 580 mm (0% at 440 mm and 100% at
580 mm)
Full selectivity (i.e. 1) between 580 mm and 660 mm
Linear decline between 660 mm and 1200 mm
100% retainability between legal size limits
Halliday & Robins (pers.
comm., 2009)
Figure 12
― Figure 13
Monthly fishing pattern (f m )
Three-month closure: Median historical monthly fishing pattern observed in Gulf
region before 1997
Four-month closure: Same as the monthly fishing pattern for the three-month closure
― Figure 14
except Oct and Nov (apply 0% for both months)
Natural mortality (M) 0.025 month -1 (0.3 year -1 ) ― ―
Instantaneous fishing mortality (F) [ 0.0513 0.1625 0.2877 0.4308 0.5978 0.7985 1.0498 1.3863 1.8971] ― ―
Commercial discard mortality (D com )
Recreational discard mortality (D rec )
30% mortality for fish smaller than minimum legal size (58 cm or 60 cm)
10% mortality for fish bigger than maximum legal size (120 cm)
10% mortality outside legal size
O’Neill (pers. comm.,
2009)
Halliday (pers. comm.,
2009)
(De Lestang et al. 2004)
―
Fishing ratio (P com )
Commercial : Recreational = 10 : 1
Halliday and Robins (pers.
comm., 2009)
(Henry & Lyle 2003)
―
Technical report prepared for the Gulf finfish review. Not government policy. 20