Morphometric features of sagittal otolith for Alaska pollock Gadus chalcogrammus in the western Bering Sea
DUAN Mi1,2, WEI Lian1,2, ZHU Guo-ping1,2,3
1.College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China; 2.Polar Marine Ecosystem Laboratory, The Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, Ministry of Education, Shanghai Ocean University, Shanghai 201306, China；3.National Engineering Research Center for Oceanic Fisheries, Shanghai 201306, China
Abstract: The morphologic features of sagittal otolith were investigated in 53 Alaska pollock Gaduschalcogrammus samples collected from western Bering Sea to evaluate the relationship between otolith and growth of Alaska pollock. The Alaska pollock has large and nearly oval sagittal otolith, with obvious rostrum and antirostrum, without obvious excisura, and Alaska pollock with body length of 35-43 cm had otolith with length (OL) of 12.93-17.05 mm and width (OW)of 5.70-7.78 mm. There is no significant difference in otolith morphology between left and right otolith(P>0.05). The statolith was increased gradually in size with the increase in body length (L), but the ratio of each morphologic parameter to body length was decreased slowly, with almost constant proportion of morphological structure. The principal component analysis(PCA) of the nine indices describing the otolith morphology revealed that otolith acreage(A), dorsal length(DL) and otolith length(OL)was used as typical morphological characteristics of Alaska pollock otolith. The relationship between the main morphological indices of the otolith and body length and wet body weight(W) indicated that there was an exponential function between OL, OW, DL, rostrum length(RL), antirostrum length(ARL), and tolith area (S) and circumference (P) and wet body weight. There was a power function relationship between OL, and DW, and wet body weight. The findings provide basic data for age determination and population identification.
段咪, 魏联, 朱国平. 西白令海阿拉斯加狭鳕矢耳石形态特征研究[J]. 大连海洋大学学报, 2018, 33(4): 492-498.
DUAN Mi, WEI Lian, ZHU Guo-ping, . Morphometric features of sagittal otolith for Alaska pollock Gadus chalcogrammus in the western Bering Sea. Journal of Dalian Ocean University, 2018, 33(4): 492-498.
2018, Vol. 33 
