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• W74496901 abstract "The study has been conducted with two phases. The first phase involvinglaboratory experiment on fish target strength measurements of three commerciallyimportant pelagic fish species of the scads namely Round scad (Decapterusmaruadsi), Ox-eye scad (Selar boops) and Yellow-banded scad (selaroidesleptolepis). The second phase include both in situ side aspect target strength andfish schools estimation attracted around fish aggregating light.Fish physical characteristics such as total length, fork length, standardlength, and weight were recorded in order to study relationship of TS to fish size.The samples sizes of Round scad, Ox-eye scad and Yellow-banded scad rangedfrom 1 1 .40 to 20.50 em, 1 0.0 to 20.7 em and 7.0 to 1 5 .6 cm (standard length),respectively. The data for each angle of insonification at 0°, 30° (side aspect), 60° (inbetween dorsal and side aspect), 900 (dorsal aspect), 1200 (in between dorsal andbroad side aspect), 1500 and 1800 (broad side aspect) were recorded by runningthe data acquisition software.Six hundred and sixteen target strength experiments were performed in thecontrolled tank (4.0 x 2.0 x 1.4 m) by using a scientific digital acoustic system(BioSonic DT6000) equipped with a 200 kHZ digital split beam transducer.Results of the average side and dorsal aspects target strength of Roundscad, measured in the controlled tank was observed to be nearly similar. Theaverage of side aspect TS was -41.4 ±2.3 dB and dorsal aspect TS was -42.5 ±2.4dB. While for Ox-eye scad there was small variation with side aspect which was -42.3 ±3.5 dB being stronger than dorsal aspect, -43.2 ±3.7 dB. However the sideaspect target strength of Yellow-banded scad showed larger variations comparedto the average target strength characteristic of Round scad with the value of -45.4±3.0 dB and -49.8 ±2.ldB for side and dorsal aspect, respectively. Results of thisstudy showed that the average all aspects target strength of the three fish speciesof scad increases as fish length increases.The target strength characteristics of the three species when expressed interm of target strength equation (TS = a log L - b), showed that the constant 'a'value vary between 15 to 36. While, the 'b' is - 86.99 to - 68.44 and tends to be species specific. This study showed that Ox-eye Scad gave lower 'b' constant thanYellow-banded Scad.The second phase of the study have been done with the purpose to applyside aspect target strength for quantifying the size of fish schools gathered aroundand bellow fish aggregating light by comparing them with the actual catch. The insitu side aspect target strength values was found varied from -3 8 . 1 to -47.5 dBwith the average of -44.7 ±3 .3 dB. From the seven attempts the target strength wascomputed to be -2.4 dB lower than that found under laboratory conditions.However, volume back scattering strength varied from -43 .8 to -5 1 .2 dB with theaverage of -47.9 ±3 . 1 dB. It was found that the average schooling density rangedbetween 0. 1 9 to 3 . 1 8 fishlm3• The acoustic estimate of fish quantity ranged from28.6 to 497 .3 kg with the actual catch ranged from 26.4 to 4 1 8. 1 kg. The results ofanalysis on the true catch showed that Ox-eye scad was the dominant species(80% of the true catch)." @default.
• W74496901 created "2016-06-24" @default.
• W74496901 creator A5022097744 @default.
• W74496901 date "1998-01-01" @default.
• W74496901 modified "2023-09-27" @default.
• W74496901 title "Target Strength and School Size Assessment of Scads Using Hydroacoustic" @default.
• W74496901 hasPublicationYear "1998" @default.
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