Acoustic Target Strength According to Different Growth Stages of Japanese Anchovy (<i>Engraulis japonicus</i>): A Comparison of Juvenile and Adult Fish
Japanese anchovy (<i>Engraulis japonicus</i>) is an economically important species found in the coastal waters of the northwestern Pacific Ocean. To conduct effective acoustic surveys on the spawning or fishing grounds of this species, the target strength (<i>TS</i>, dB re 1...
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| Format: | Article |
| Language: | English |
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MDPI AG
2023-08-01
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| Series: | Journal of Marine Science and Engineering |
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| Online Access: | https://www.mdpi.com/2077-1312/11/8/1575 |
| _version_ | 1797584199260045312 |
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| author | Hansoo Kim Sungho Cho Mira Kim Sunhyo Kim Donhyug Kang |
| author_facet | Hansoo Kim Sungho Cho Mira Kim Sunhyo Kim Donhyug Kang |
| author_sort | Hansoo Kim |
| collection | DOAJ |
| description | Japanese anchovy (<i>Engraulis japonicus</i>) is an economically important species found in the coastal waters of the northwestern Pacific Ocean. To conduct effective acoustic surveys on the spawning or fishing grounds of this species, the target strength (<i>TS</i>, dB re 1 m<sup>2</sup>) during its growth stages must be understood. However, knowledge regarding the <i>TS</i> of juvenile Japanese anchovies is limited. To address this knowledge gap, we measured the <i>TS</i> and proposed equation models for juvenile Japanese anchovies while describing the <i>TS</i> differences between young and adult anchovies. We evaluated 21 live anchovies using 38, 120, and 200 kHz transducers. <i>TS</i> models were fitted for the juvenile stage of anchovies, considering different frequencies. The mean <i>TS</i> values of young and adult anchovies were similar to those reported in previous <i>TS</i> studies, whereas the <i>TS</i> values of juvenile anchovies were significantly lower. Thus, applying the same <i>TS</i> equation based on the acoustic characteristics of anchovies at different growth stages, especially for juvenile anchovies, may not be appropriate. These findings underscore the importance of adopting a suitable <i>TS</i> equation specific to the growth stages of Japanese anchovies for accurate data analysis in acoustic surveys conducted on spawning and fishing grounds. |
| first_indexed | 2024-03-10T23:49:41Z |
| format | Article |
| id | doaj.art-a0377658857a4c9ba04010384a1a5e4e |
| institution | Directory Open Access Journal |
| issn | 2077-1312 |
| language | English |
| last_indexed | 2024-03-10T23:49:41Z |
| publishDate | 2023-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Journal of Marine Science and Engineering |
| spelling | doaj.art-a0377658857a4c9ba04010384a1a5e4e2023-11-19T01:46:02ZengMDPI AGJournal of Marine Science and Engineering2077-13122023-08-01118157510.3390/jmse11081575Acoustic Target Strength According to Different Growth Stages of Japanese Anchovy (<i>Engraulis japonicus</i>): A Comparison of Juvenile and Adult FishHansoo Kim0Sungho Cho1Mira Kim2Sunhyo Kim3Donhyug Kang4Marine Domain and Security Research Department, Korea Institute of Ocean Science and Technology (KIOST), Busan 49111, Republic of KoreaMarine Domain and Security Research Department, Korea Institute of Ocean Science and Technology (KIOST), Busan 49111, Republic of KoreaMarine Domain and Security Research Department, Korea Institute of Ocean Science and Technology (KIOST), Busan 49111, Republic of KoreaMarine Domain and Security Research Department, Korea Institute of Ocean Science and Technology (KIOST), Busan 49111, Republic of KoreaMarine Domain and Security Research Department, Korea Institute of Ocean Science and Technology (KIOST), Busan 49111, Republic of KoreaJapanese anchovy (<i>Engraulis japonicus</i>) is an economically important species found in the coastal waters of the northwestern Pacific Ocean. To conduct effective acoustic surveys on the spawning or fishing grounds of this species, the target strength (<i>TS</i>, dB re 1 m<sup>2</sup>) during its growth stages must be understood. However, knowledge regarding the <i>TS</i> of juvenile Japanese anchovies is limited. To address this knowledge gap, we measured the <i>TS</i> and proposed equation models for juvenile Japanese anchovies while describing the <i>TS</i> differences between young and adult anchovies. We evaluated 21 live anchovies using 38, 120, and 200 kHz transducers. <i>TS</i> models were fitted for the juvenile stage of anchovies, considering different frequencies. The mean <i>TS</i> values of young and adult anchovies were similar to those reported in previous <i>TS</i> studies, whereas the <i>TS</i> values of juvenile anchovies were significantly lower. Thus, applying the same <i>TS</i> equation based on the acoustic characteristics of anchovies at different growth stages, especially for juvenile anchovies, may not be appropriate. These findings underscore the importance of adopting a suitable <i>TS</i> equation specific to the growth stages of Japanese anchovies for accurate data analysis in acoustic surveys conducted on spawning and fishing grounds.https://www.mdpi.com/2077-1312/11/8/1575acoustic target strength (<i>TS</i>)Japanese anchovyjuvenilegrowth stage |
| spellingShingle | Hansoo Kim Sungho Cho Mira Kim Sunhyo Kim Donhyug Kang Acoustic Target Strength According to Different Growth Stages of Japanese Anchovy (<i>Engraulis japonicus</i>): A Comparison of Juvenile and Adult Fish Journal of Marine Science and Engineering acoustic target strength (<i>TS</i>) Japanese anchovy juvenile growth stage |
| title | Acoustic Target Strength According to Different Growth Stages of Japanese Anchovy (<i>Engraulis japonicus</i>): A Comparison of Juvenile and Adult Fish |
| title_full | Acoustic Target Strength According to Different Growth Stages of Japanese Anchovy (<i>Engraulis japonicus</i>): A Comparison of Juvenile and Adult Fish |
| title_fullStr | Acoustic Target Strength According to Different Growth Stages of Japanese Anchovy (<i>Engraulis japonicus</i>): A Comparison of Juvenile and Adult Fish |
| title_full_unstemmed | Acoustic Target Strength According to Different Growth Stages of Japanese Anchovy (<i>Engraulis japonicus</i>): A Comparison of Juvenile and Adult Fish |
| title_short | Acoustic Target Strength According to Different Growth Stages of Japanese Anchovy (<i>Engraulis japonicus</i>): A Comparison of Juvenile and Adult Fish |
| title_sort | acoustic target strength according to different growth stages of japanese anchovy i engraulis japonicus i a comparison of juvenile and adult fish |
| topic | acoustic target strength (<i>TS</i>) Japanese anchovy juvenile growth stage |
| url | https://www.mdpi.com/2077-1312/11/8/1575 |
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