Table 7 Summary of all Mediterranean studies testing the juveniles’ sorting grid (JSG) and the results obtained, including the present study.
From: Vitality insights of fish escaping from a sorting grid installed on a bottom trawl net
Species | GSA | JSG type | JSG bar spacing (mm) | Codend meshes (mm) | Sampling method | Results | Reference |
|---|---|---|---|---|---|---|---|
Merluccius merluccius | 6 | rigid, with funnel | 20 | 40, diamond | Double codend | L50: 18.8 cm; SR: 2.1 cm | Sardà et al.18 |
6 | rigid, with funnel | 20 | 40, diamond | Double codend | L50: 14.2 cm; SR: 7.3 cm | Sardà et al.20 | |
6 | rigid, with funnel | 15 | 40, diamond | Double codend | L50: 5.9 cm; SR: 3.5 cm | Sardà et al.19 | |
6 | rigid, with funnel | 20 | 40, diamond | Double codend | L50: 13.3 cm; SR: 2.6 cm | Sardà et al.19 | |
6 | flexible, with funnel | 20 | 40, diamond | Cover-codend | L50: 17.2 cm; SR: 6.2 cm | Bahamon et al.17 | |
6 | flexible, without funnel | 20 | 40, diamond | Cover-codend | L50: 13.2 cm; SR: 3.6 cm | Bahamon et al.17 | |
5 | flexible, with funnel | 15 | 40, diamond | Divided bottom trawl | L50: 10.9 cm; SR: 5.1 cm | Massutì et al.34 | |
5 | flexible, with funnel | 20 | 40, diamond | Divided bottom trawl | L50: 18.9 cm; SR: 3.4 cm | Massutì et al.34 | |
22 | rigid, with funnel | 20 | 44, diamond | Cover-codend | Catch separation: 64% in number and 85% in weight | Aydin et al.23 | |
22 | rigid, with funnel | 20 | 40, square | Cover-codend | Catch separation: 83% in number and 93% in weight | Aydin et al.23 | |
22 | rigid, with funnel | 10–15 | 44, diamond | Double codend | Catch separation between 96 to 100% in weight | Aydin and Tosunoǧlu24 | |
16 | rigid, with funnel | 20 | 40, square | Alternate hauls with standard net | 34% reduction in catch efficiency of undersized individuals; no reduction in catch efficiency of legal-sized individuals | Vitale et al.26 | |
16 | rigid, with funnel | 25 | 40, square | Alternate hauls with standard net | 38% reduction in catch efficiency of undersized individuals; significant reduction (~ 40%) in catch efficiency of legal-sized individuals | Vitale et al.26 | |
16 | rigid, with funnel | netting instead of bars − 40, square | 40, square | Alternate hauls with standard net | 44% reduction in catch efficiency of undersized individuals; 39% reduction in catch efficiency of legal-sized individuals | Vitale et al.26 | |
6 | rigid, with funnel | netting instead of bars − 40, square | 40, square | Alternate hauls with standard net | 95% reduction in catch efficiency of undersized individuals | Maynou et al.22 | |
9 | flexible, without funnel | 20 | 40, square | Alternate hauls with standard net | Significant reduction in catch efficiency of undersized individuals; no reduction in catch efficiency of legal-sized individuals | Sbrana et al.27 | |
16 | rigid, with funnel | netting instead of bars − 40, square | 40, square | Alternate hauls with standard net | Significant reduction in catch efficiency of undersized individuals; no reduction in catch efficiency of legal-sized individuals | Geraci et al.29 | |
17 | flexible, with funnel | 20 | 40, square | Alternate hauls with standard net | 70% reduction in catch efficiency of undersized individuals; 44% reduction in catch efficiency of legal-sized individuals | Present study | |
Nephrops norvegicus | 6 | flexible, without funnel | 20 | 40, diamond | Cover-codend | L50: 20.5 cm; SR: 9.3 cm | Bahamon et al.17 |
5 | flexible, with funnel | 15 | 40, diamond | Divided bottom trawl | L50: 21.2 cm; SR: 6.7 cm | Massutì et al.21 | |
5 | flexible, with funnel | 20 | 40, diamond | Divided bottom trawl | L50: 23.8 cm; SR: 8.6 cm | Massutì et al.21 | |
17 | flexible, with funnel | 20 | 40, square | Alternate hauls with standard net | 79% reduction in catch efficiency of undersized individuals; 56% reduction in catch efficiency of legal-sized individuals | Present study | |
Parapenaeus longirostris | 22 | rigid, with funnel | 10 | 44, diamond | Double codend | Catch separation 60.8% in number and 70.7% in weigth | Aydin and Tosunoǧlu24 |
22 | rigid, with funnel | 15 | 44, diamond | Double codend | Catch separation 37% in number and 44.4% in weigth | Aydin and Tosunoǧlu24 | |
16 | rigid, with funnel | 20 | 40, square | Alternate hauls with standard net | 59% reduction in catch efficiency of undersized individuals, 30% reduction in catch efficiency of legal-sized individuals | Vitale et al.26 | |
16 | rigid, with funnel | 25 | 40, square | Alternate hauls with standard net | 73% reduction in catch efficiency of undersized individuals, 36% reduction in catch efficiency of legal-sized individuals | Vitale et al.26 | |
16 | rigid, with funnel | netting instead of bars − 40, square | 40, square | Alternate hauls with standard net | 60% reduction in catch efficiency of undersized individuals; 25% reduction in catch efficiency of legal-sized individuals | Vitale et al.26 | |
6 | rigid, with funnel | netting instead of bars − 40, square | 40, square | Alternate hauls with standard net | 100% reduction in catch efficiency of undersized individuals | Maynou et al.22 | |
9 | flexible, without funnel | 20 | 40, square | Alternate hauls with standard net | No reduction in catch efficiency of undersized individuals; significant reduction in catch efficiency of legal-sized individuals | Sbrana et al.27 | |
16 | rigid, with funnel | netting instead of bars − 40, square | 40, square | Alternate hauls with standard net | Significant reduction in catch efficiency of undersized individuals; significant increase in catch efficieny of legal-sized individuals | Geraci et al.29 | |
17 | flexible, with funnel | 20 | 40, square | Alternate hauls with standard net | 59% reduction in catch efficiency of undersized individuals; 71% reduction in catch efficiency of legal-sized individuals | Present study |
