Affiliation:
1. Bureau of Fisheries and Aquatic Resources – National Stock Assessment Program (NSAP) V
Abstract
The tigertooth croaker, Otolithes ruber (Bloch and Schneider 1801), was studied to determine its reproductive biology characteristics for 34 months from March 2015 to November 2017. A total of 7,977 individuals were sampled and the measured total lengths (TL) ranged from 8.1 cm to 32.1 cm (16.70 ± 2.53 cm ) and 10.0 cm to 33.5 cm (17.95 ± 2.95 cm) for male and female, respectively. The length-weight relationship can be summarized as W = 0.00521 L3.18 and W = 0.00837 L3.01 for female and male, respectively. The length at first maturity of this species was determined to be 13.95 cm, which is smaller compared to other studies. The overall sex ratio of this species was 1:0.8, with males dominating the female sex (P < 0.05, X2 = 64.3). In addition, synchronized development of male and female gonads was observed. It was also verified that mature individuals were present all throughout the study period indicating that this species spawn continuously and the presence of juveniles during the sampling period indicated continuous recruitment. Mean monthly GSIs indicate July to November as the main spawning season of this species. The in-site occurrence of mature and juvenile stocks in the bay further implicates that San Miguel Bay is a nursery ground for this species. The fecundity varied between 3,420 to 422,100 with an average fecundity of 86,142 eggs. Lastly, the spawning potential ratio is still above the limit reference point (SPR = 0.36), indicating that the stock can still replenish their biomass.
Publisher
National Fisheries Research and Development Institute
Reference41 articles.
1. AL Nahdi A, Garcia de Leaniz C, King AJ. 2016. Spatio-temporal variation in length- weight relationships and condition of the ribbonfish Trichiurus lepturus (Linnaeus, 1758): Implications for fisheries management. PLoS One. 11(8):e0161989. Available from: https://doi.org/10.1371/journal.pone.0161989.
2. Armstrong MJ, Gerritsen HD, Allen M, McCurdy WJ, Peel JAD. 2004. Variability in maturity and growth in a heavily exploited stock: cod (Gadus morhua L.) in the Irish Sea. ICES J Mar Sci. 61(1): 98–112. Available from: https://doi.org/10.1016/j.icesjms.2003.10.005
3. Azhir MT. 2008. Biological investigation of tiger-toothed croaker, Otolithes ruber, in Oman Sea along Sistan and Baluchistan Province. Iranian Scientific Fisheries Journal. 17(1): 1–10.
4. Bailey C. 1982. Small-Scale fisheries of San Miguel Bay, Philippines: occupational and geographic mobility. Manila, Philippines: Institute of Fisheries Development and Research, College of Fisheries, University of the Philippines in the Visayas, Quezon City, Philippines; International Center for Living Aquatic Resources Management, Manila, Philippines; and the United Nations University, Tokyo, Japan ICLARM Technical Report Report No. 10.
5. Brusle J. 1981. Sexuality and biology of reproduction in grey mullets. In: Oren, O.H. (ed.) Aquaculture of grey mullets. International Biological Programme No. 26. Cambridge University Press, Cambridge, 94-154.
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