부레를 갖는 6개 어종의 광대역 음향산란특성에 대한 부레 가스 제거의 효과
The Effect of Removing Swimbladder Gas on the Broadband Acoustic Backscattering Characteristics of Six Species of Swimbladdered Fish
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초록
The single anatomical attribute that has the greatest influence on acoustic scattering from fish is the presence or absenceof a swimbladder. This study examined the effect of removing the gas from the swimbladder on the broadbandbackscattering characteristics of six species of swimbladdered fish: striped beakperch Oplegnathus fasciatus, blackscraper Thamnaconus modestus, dark-banded rockfish Sebastes inermis, goldeye rockfish Sebastes thompsoni,black rockfish Sebastes schlegeli and panther puffer Takifugu pardalis. Before and after removing the gas fromthe swimbladder, the species-specific, frequency-dependent backscattered echo signals from anaesthetized individualsof each fish species were measured at approximately 1° intervals spanning a 90° aspect angle rangefrom -45° (head down) to +45° (head up) using a broadband echo sounder operating at 100-200 kHz. The relationshipbetween the wavelength-normalized backscattering cross section (σ/λ2) and fish length (L/λ) was calculatedfor each species. The average σ/λ2 value for the six fish species at a L/λ range of 19.79-25.85, with a mean of22.89, was reduced by approximately 52.3% when the gas was removed.
Abstract
The single anatomical attribute that has the greatest influence on acoustic scattering from fish is the presence or absenceof a swimbladder. This study examined the effect of removing the gas from the swimbladder on the broadbandbackscattering characteristics of six species of swimbladdered fish: striped beakperch Oplegnathus fasciatus, blackscraper Thamnaconus modestus, dark-banded rockfish Sebastes inermis, goldeye rockfish Sebastes thompsoni,black rockfish Sebastes schlegeli and panther puffer Takifugu pardalis. Before and after removing the gas fromthe swimbladder, the species-specific, frequency-dependent backscattered echo signals from anaesthetized individualsof each fish species were measured at approximately 1° intervals spanning a 90° aspect angle rangefrom -45° (head down) to +45° (head up) using a broadband echo sounder operating at 100-200 kHz. The relationshipbetween the wavelength-normalized backscattering cross section (σ/λ2) and fish length (L/λ) was calculatedfor each species. The average σ/λ2 value for the six fish species at a L/λ range of 19.79-25.85, with a mean of22.89, was reduced by approximately 52.3% when the gas was removed.
참고문헌 (21)
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