| Based on the samples of Cololabis saira collected by "lupengyuanyuO27" of Penglai jing lu ocean fishery company and "guoji908" of Dalian international ocean fishery company and operating in the Northwest Pacific Ocean during June to July and October to November 2014(921 pieces of statolith morphology were measured, including 168 pieces of statolith increment counting), it analysed staotolith microstructure and its growth, and using the otolith microstructure to research age and growth of Cololabis saira. The main results can be found as follow:(1) At the end of 921 samples, male and female ratio was 1.6:1, sexual maturity was given priority to with I, II and III stage, the range of body length was 159mm to 361 mm, the average of body length was 275 mm. Range of body weight was 29g to 192 g, its average value was 119 g. the relationship of body length and body weight was power function, the relation were:BW=2×10-7BL3.552 (R2=0.9142, n=921)(2) Statolith of Cololabis saira was flat and oval, its core was on the back-end, it has an apparent rostrum which was longer than the antirostrum. Statolith microstructure included core area, dark area and transparent area. From the core to the transparent area edge, increment width was from wide to narrow, brightness was from dark to bright, mark increment distributed in the transparent area.(3) Statolith morphological parameters had bigger relevance with the statolith weight, the relationship of TSL, SR, DL, DW, RL and statolith weight was power function, the relationship of MW, RW, WL and statolith weight was logarithmic function,the relation were: TSL=2117.5(SW)03463 (R2=0.7063, n=921) MW=360.191n(SW)+1330 (R2=0.7324, n=921) SR=852.96(SW)0374 (R2=0.6408, n=921) DL=1448.8(SW)03365 (R2=0.5878, n=921) DW=599.5(SW)03202 (R2=0.5073, n=921) RL=1267.9SW)03426 (R2=0.5181, n=921) RW=196.191n(SW)+728.92 (R2=0.4983, n=921) WL=248.971n(SW)+399.83 (R2=0.2914, n=921)There was no significant difference between male and female individuals (P> 0.05). The statolith weight of the individual had significant differences between length groups (P< 0.01), in addition to the width group 800μm to 900μm and 900μm to 1000μm, the other groups were obvious significant differences (P< 0.01).(4) By extracting principal component, TSL and DL can as a representative of the characteristic length, MW and RW can as a representative of the width, and the cumulative contribution rate was 86.852%. The relationship between TSL, MW, DL RW and body length had obvious linear relationship, there was no significant difference between male and female individuals (P> 0.05), the formula respectively were: BL=0.0899 TSL+110.4 (R2=0.4484, n=921) BL=0.166 MW+83.839 (R2=0.5098, n=921) BL=0.1141 DL+131.35 (R2=0.3938, n=921) BL=0.2093 RW+140.4 (R2=0.8277, n=921)The relationship between TSL, MW, DL, RW and body weight had obvious power function relationship, there was no significant difference between male and female individuals (P> 0.05), the formula respectively were: BW=2×10-6(TSL)2.3716 (R2=0.4909, n=921) BW=5×10-6(MW)2.7198 (R2=0.5465, n=921) BW=6×10-6(DL)2.0347 (R2=0.412, n=921) BW=0.0004 (RW)1.9496 (R2=0.3879, n=921)(5) During the maturation stage Ⅰ and Ⅱ to V, TSL, MW, DL and RW existed significant difference (P< 0.05), from stage I to V, TSL, MW, DL and RW average increased gradually, stage Ⅰ to stage Ⅱ and stage VI to V,TSL, MW, DL and RW mean increased apparent.(6) The relationship between TSL, DL and age had obvious linear relationship, and the relationship of MW, RW and age was logarithmic function, the relation were: TSL=1.6056Age+1194.7(R2=0.4389, n=168) MW=417.331n(Age)-1321.8(R2=0.5550, n=168) DL=1.1917Age+796.7(R2=0.4250, n=168) RW=230.821n(Age)-723.92(R2=0.4284, n=168) SW=0.0028 (Age) 0921(R2=0.5673, n=168)The study found that with the increasing of age, TSL, MW, DL, RW average will increase, but in the 450 to 500 d, TSL, MW, DL mean was lower than the age group of 400 to 450 d. There was no significant difference for MW/TSL in different age groups (P> 0.05), with the increaseing of age the otolith shape did not change.(7) The range of age was 204d to 549d, the range of advantage age for 360d to 480d, the minimum age was 204 d, its length was 207 mm and weight was 39 g, the biggest days of age was 549 d, its length was 291 mm and weight was 131 g.(8) The hatch date of samples was December 2012 to April 2014, hatching peak appeared in winter (12-2 month), spring (3-5 month) and autumn (9-11 month), spawning groups of Cololabis saira in the northwestern Pacific was observed in winter,spring and autumn.(9) Based on the index, linear, logarithm, power function, Logistic, Von Bertalanffy and Gompertz growth model, study found the body length and weight growth model was suitable for Logistic growth model, the formula respectively were: (?) (R2=0.6315, n=168) (?) (R2=0.6315, n=168)(10) Mean AGR and G of body length respectively was 0.224mmd"1 and 0.00088, the maximum AGR(0.414 mmd-1) and G(0.00177)appeared 251 to 300d, AGR decreased with age increasing. AGR and G mean of body weight respectively was 0.293mmd"1 and 0.00325, the maximum AGR (0.504 mmd-1) and G (0.00486) appeared 351 to 400d. |
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