00000caa a22000003i 4500 UP-1685594773862388316 Buklod 20210309164637.0 m | | ta 210309s2017 xx r |||| u|eng d (iLib)UPBAG-00039458318 STII-DOST BAG rda eng ARTICLE-2528 Santos, Brian S. author. Length-weight and length-length relationships, condition factor, sex ratio and gonadosomatic index of the ariid catfishes arius dispar and arius manillensis (siluriformes ariidae) in Laguna de Bay, Philippines by Brian S. Santos, Reynand Jay C. Canoy, Jazzlyn M. Tango-Imperial and Jonas P. Quilang. 2017. pages 84-94 illustrations 26 cm text rdacontent unmediated rdamedia volume rdacarrier Includes bibliographical references (pages 93-94) The ariid catfishes Arius dispar and Arius manillensis are commercially important in the Philippines and have been overexploited in the past. This study describes for the first time the length-weight and length-length relationships, condition factor, sex ratio, and gonadosomatic index of the two species. A total of 1,698 A. dispar and 874 A. manillensis were collected from Laguna de Bay over the period of 12 months to assess the aforementioned parameters. For both species, the sex ratio significantly differed from equality, the length-length relationships were highly significant and the coefficients of determination (r2) were all greater than 0.96. Length frequency analysis indicates overfishing for both species. The average monthly gonadosomatic index (GSI) ranged from 0.04 to 0.15 in A. dispar males and from 0.23 to 2.99 in females. The average monthly GSI ranged from 0.04 to 0.49 in A. manillensis males and from 0.28 to 4.02 in females. For females of each of the two species, the GSI had two peaks: one from February to May (dry months) and the other from July to September (wet months). These peaks might correspond to the spawning runs of these two species. This study provides baseline information which can be used for the management and conservation of these economically important fishery resources. (Author's abstract) Nutrition. Arius. Comparative growth. Gonadosomatic index. Fishery management. Reproductive period. Canoy, Reynand Jay C. author. Tango-Imperial, Jazzlyn M. author. Quilang, Jonas P. author. The Philippine Journal of Science Vol. 146, no. 1, March 2017. Request full-text access via UPB University Library through https://forms.gle/KZjBv7aRtY6jiL5E9 (viewed 09 March 2021) FI UPBAG UPBAG-MAIN ARTICLE-2528 Analytics