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|Title: ||Growth of Argentine shortfin squid, Illex argentinus, in the Southwest Atlantic during its post-recruitment migration|
|Authors: ||Chili-shin Chen|
age and growth
|Issue Date: ||2017-02-07T06:18:32Z
|Publisher: ||ACTAOCEANOGRAPHICA TAIWANICA|
|Abstract: ||Abstract: The growth pattern of Illex argentinus (188 to 355 mm of mantle length, ML) was studied based on 107-pair statoliths taken from 7 samples of post-recruited squid obtained from Southwest Atlantic . All increments on each statolith were examined and digitized along the longest axis. The calculated increment widths showed a size variation that was higher for female (1.7-2.4 urn) and lower for male (1.0-2.5 urn), Mantle length (ML) at age (t) in weekly basis was back-calculated from daily increment width, and was best fitted by power function for female (ML = 7.337 x t 0 959 ) and linear function for male (ML =1.906+ 5.466 x t). Growth pattern measured in biomass (BW), converting from weight (BW)-Iength (ML) relationship (BW =3.474ML33 48 (x10-6 ) ) , was best described by power equation: BW =0.002 xt 33 32 and BW =0.00I xt 3 299 for female and male, respectively. Body size indicated a sexual dimorphism, in which females became significantly larger by length when 50 days old, and iater weight difference was found when 130 days old. For each individual, initial daily growth rate was high at 0.96 (mm dol) for female and 0.83 for male during first week ; it decreased in the following few weeks, and recovered to reach a maximum at an age ca. 200 d (1.10 and 0.86 mm dol for female and male, respectively). In general, overall growth rate was higher in females (0.64- 1.36 mm dol) than in males (0.61-1.09). Austral winter (July-September) hatched individua l had higher growth rate, and followed by autumn one (April-June). The hatching months of J. argentinus were estimated to be March-October, and to peak on May and June.|
|Appears in Collections:||[海洋事務與資源管理研究所] 期刊論文|
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