The length-weight relationship, food habits and condition factor of wild juvenile milkfish in Sri Lanka
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Wild juvenile milkfish (Chanos chanos) were obtained from Negombo lagoon in September 1984. Thirty-one specimens (92–186 mm FL) had a fork length-body weight relationship of log W = −5.6083 + 3.2598 log L. These fish were caught in the early morning and had empty guts. The mean condition factor (K) was 8.7. The intestine length to fork length ratio (I) was 3.7. Two large specimens (245 mm and 340 mm FL) caught around mid-day from the ocean off Negombo had full guts. Food was mostly blue-green algae, diatoms and detritus, with a number of copepods and nematodes. These fish had K values of 11.7 and 13.6 and I values of 8.1 and 8.5. The age and the month of spawning of these fish were back-calculated using known milkfish growth rates. It seems that in Sri Lanka, milkfish spawn from January to at least November.
Contribution No. 174 of the SEAFDEC Aquaculture Department.
CitationBagarinao, T., & Thayaparan, K. (1986). The length-weight relationship, food habits and condition factor of wild juvenile milkfish in Sri Lanka.
We thank Dr. Y. Taki and Dr. H. Kohno of the SEAFDEC Aquaculture Department for critical review of the manuscript. This study was partially supported by the International Development Research Centre (IDRC, Canada) through a grant to the SEAFDEC Aquaculture Department under Project No. 3-P-81-0171 (Phase III).
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Conference paperK Thayaparan & RD Chakrabarty - In JV Juario, RP Ferraris & LV Benitez (Eds.), Advances in milkfish biology and culture: Proceedings of the Second International Milkfish Aquaculture Conference, 4-8 October 1983, Iloilo City, Philippines, 1984 - Published by Island Pub. House in association with the Aquaculture Dept., Southeast Asian Fisheries Development Center and the International Development Research CentreMilkfish (Chanos chanos ) fry and fingerlings are abundant in coastal and brackishwater areas in Sri Lanka, yet the industry remains in a stage of underdevelopment. The main seed collection centers are Mannar and Kalpitiya in the northwest and the season is from March to June. The annual fry production potential of the Mannar tidal flats is estimated to be about 4 million. The brackishwater aquaculture potential of Sri Lanka is estimated to be about 120,000 ha. In the past, returns from fry collected from tidal pools and stocked into perennial tanks have been very poor. The recently initiated seed resources survey and investigations into scientific collection, transport, and culture including pen culture should help develop farming of milkfish in Sri Lanka. Polyculture of the species with other fish and shrimp and its culture in salterns are being attempted.
ArticleT Bagarinao -
Journal of Inland Fisheries, 1986 - Ministry of Fisheries and Aquatic Resources, Sri LankaA summary is provided of information concerning the milkfish (Chanos chanos) seed resources of Sri Lanka, highlighting problems related to seed collection. Various recommendations are made to overcome these problems and the following areas are covered: logistic aspects; technical aspects; seed supply; demand for seed; uneven sizes of seed; storage techniques; mortality; collection season; shore waters and other new collection grounds; development of collection methods and gear; and, identification of milkfish fry.
ArticleDD Baliao -
Journal of Inland Fisheries, 1982 - Ministry of Fisheries and Aquatic ResourcesThe author reviews the present methods of milkfish (Chanos chanos) fry collection and presents his observations and recommendations of improvement.