Design and Operation of “Siklob”, a Mechanised Falling Gear Operated in Northern Iloilo, Philippines

Fisheries in the Philippines is multispecies, and this is seen with the wide variety of fishing gears used in major and minor fishing grounds in the country. These gears constantly face modification and development to improve catch quality, quantity, and overall efficiency. This study investigated the features of “siklob”, a mechanised falling gear operated along the municipal waters of Northern Iloilo, Philippines. Some coastal residents claimed that fishers use fine mesh nets for this gear, and this was because of some incidences of the capture of very small fish. Results of this study, however, indicate that the mesh size of nettings used for “siklob” is 4.35 cm, which is above the minimum set by the national law (3 cm). The gear is operated offshore, in a fishing vessel, with lights and fish-finding devices. The catch included an array of pelagic to benthic species, with Sardinella gibbosa (Bleeker, 1849) as the top species. The catch per unit effort values for two fishing operations were 17.40 kg.cast-1 and 16.5 kg.cast-1, respectively. If a management plan for the gear is to be implemented in the area, it would be necessary first to study the spawning seasons of commercially important species and impose closed fishing seasons. Before any attempt to ban or control the use of the gear, it is necessary first to understand the gear design, performance, and selectivity.

PENGGUNAAN IKAN TEMBANG (Sardinella gibbosa) SEBAGAI UMPAN PADA ATRAKTOR UMPAN VERTIKAL TERHADAP HASIL TANGKAPAN BAGAN APUNG

Bagan apung merupakan salah satu jenis alat tangkap yang digunakan oleh nelayan dioperasikan pada malam hari dengan bantuan lampu sebagai atraktor (light fishing). Penggunaan umpan vertikal berisi ikan rucah tembang akan mempermudah mengumpulkan ikan kembali karena adanya potensi ikan untuk meloloskan diri saat hauling. Penelitian ini bertujuan untuk membandingkan komposisi hasil tangkapan bagan apung dengan penggunaan umpan vertikal dengan bagan apung kontrol, mengetahui pengaruh penggunaan umpan vertikal terhadap jumlah total hasil tangkapan bagan apung, dan menentukan frekuensi hauling bagan apung. Penelitian ini menggunakan metode experimental fishing atau uji coba langsung di lapang melalui kegiatan operasi penangkapan ikan. Analisis data yang digunakan yaitu analisis deskriptif dan analisis statistik. Hasil penelitian yang diperoleh menunjukkan bahwa hasil tangkapan bagan apung yang dioperasikan sebanyak 20 kali ulangan memperoleh 19 jenis ikan hasil tangkapan dengan lima jenis ikan dominan yang tertangkap yaitu ikan tembang (Sardinella gibbosa), ikan lisong (Euthynnus affinis), ikan pepetek (Leiognathus equulus), ikan semar (Mene maculate), dan cumi-cumi (Loligo sp). Berdasarkan experimental fishing yang dilakukan bahwa penggunaan umpan secara vertikal berisi ikan tembang berpengaruh nyata terhadap hasil tangkapan bagan apung dan frekuensi hauling bagan apung perlakuan berjumlah 82 kali, frekuensi tersebut lebih banyak dibandingkan dengan bagan apung kontrol yang hanya berjumlah 50 kali. Kata kunci: atraktor, bagan apung, hauling, umpan, vertikal

Quality assessment of fishes caught by single-day and multi-day gillnet fishing off Satpati Coast, Maharashtra, India

The present investigation was aimed at elucidating the importance of freshness and quality for the consumer and its relationship to sensory and non-sensory properties of fish caught by single-day and multi-day gillnet fishing off Satpati Coast, Palghar District, Maharashtra, India. Selected species of marine fishes viz., Pampus argenteus, Ilisha filigera, Osteogeneiosus militaris, Thryssa mystax and Sardinella gibbosa from single-day and multi-day gillnet fishing trips were collected and assessed based on freshness score, microbiological and biochemical parameters. The average values of sensory score, total plate count (TPC) and pH for fish samples from single-day fishing were 25 to 26; 1.9×104 cfu g-1 to 7.3×104 cfu g-1 and 6.8 respectively, whereas for multi-day fishing, it was 12 to 17; 7.1×104 cfu g-1 to 1.8×105 cfu g-1 and 7.07 respectively. Significant difference (p<0.05) was observed for the values of pH, trimethyl amine (TMA), total volatile base-nitrogen (TVB-N) and thiobarbituric acid reactive substances (TBARS) between the fish samples from single-day and multi-day fishing for two species viz. T. mystax and I. filigera. The study indicated that fishes caught from both single-day and multi-day units were acceptable for human consumption. Results of the study provides insight into the quality aspects of fish landed by commercial fishing crafts by comparing single-day and multi-day fishing.

TINGKAT PENGELOLAAN IKAN TEMBANG (Sardinella gibbosa) YANG TERTANGKAP DENGAN BAGAN TANCAP DI KABUPATEN PANGKEP

The success of fishing depends on sufficient knowledge of the overall behavior of the fish, which is the basis for the development of existing methods. Utilization of Fishery Potential Activities in Pangkep Regency waters still depends a lot on simple fish catching technology. One of the factors for the success of catching fish with a chart is light. Light is a tool to help collect fish to the fishing area. Toli-toli village, Tekkolabua sub-district, Pangkep district is geographically located between 04º79'07.71 "- 4º79'14.35" LS and 119º43'75.13 "- 119º44'02.01" East Longitude (Figure 4). The administrative area is included in the North Liukang Tupabbiring District, Pangkep Regency. The production of tembang fish (S. gibbosa) caught with fixed-line fishing gear occurred in 2012 as much as 927.70 tons and the lowest was in 2009 as many as 50.30 tons. The level of utilization (TP) and level of cultivation (TPu) of fixed-line fisheries in Pangkep waters according to the Schaefer model for 8 years has exceeded the allowable utilization rate (JTB), namely in 2011, 2012, 2013, and in 2008, 2009 , 2010, 2014 and 2017 are still in an underexploited condition. Based on the analysis of the sustainable potential of tembang fish using the Schaefer model, the allowable amount of tembang fish catch (JTB) is 80% of the MSY value, it is recommended that the number of fish catches allowed in Pangkep Regency is 409.36 tons with a maximum number of fishing effort units of 26 units / year.