Browsing by Author "Gerochi, D. D."
ArticleMN Lijauco, EG Griño, DD Gerochi & EM Rodriguez -
SEAFDEC Aquaculture Department Quarterly Research Report, 1978 - SEAFDEC Aquaculture DepartmentA study was conducted comparing the growth of stunted and non-stunted milkfish.
ArticleDD Baliao, EM Rodriguez & DD Gerochi -
SEAFDEC Aquaculture Department Quarterly Research Report, 1981 - SEAFDEC Aquaculture DepartmentThe culture potential of hatchery-produced grey mullet (Mugil cephalus , Linnaeus) stocked with average weight of 3.7 g and at 2,500 (treatment I) and 3,000 (treatment II) fingerlings/ha in six 350m brackishwater ponds following the lab-ab method of culture was studied.
Culture of the mud crab, Scylla serrata (Forskal) at different stocking densities in brackishwater ponds DD Baliao, EM Rodriguez & DD Gerochi -
SEAFDEC Aquaculture Department Quarterly Research Report, 1981 - SEAFDEC Aquaculture DepartmentThe mean weight percentage survival, relative growth increment, net production and feed conversion value of S. serrata stocked in monoculture at different stocking densities are presented.
Growth and survival rates of hatchery-produced and wild milkfish fry grown to fingerling size in earthen nursery ponds DD Baliao, EM Rodriguez & DD Gerochi -
SEAFDEC Aquaculture Department Quarterly Research Report, 1980 - SEAFDEC Aquaculture DepartmentGrowth and survival rates of hatchery-produced and wild milkfish (Chanos chanos) fry grown to fingerling size were compared. Data show no significant difference between the 2 fry. At a recommended stocking density of 30 fry/m2, hatchery-produced milkfish fry could attain fingerling size of almost 2g with a survival of 68%. The study indicates that hatchery-produced fry/fingerlings can equal the culture performance of the wild fry. Comparative performance of hatchery-bred and wild fry should encourage intensified research on milkfish broodstock development and refinement of induced spawning methods.
ArticleDD Gerochi, PG Padlan, ID Buenconsejo, JN Paw & EM Rodriguez -
SEAFDEC Aquaculture Department Quarterly Research Report, 1978 - SEAFDEC Aquaculture DepartmentFour size groups of milkfish were tested, 4-18 g, 20-34 g, 35-95 g and 200-300 g. A number of fish from each group were placed separately in identical 1.2 m2 wooden tanks containing seawater filled up to 30 cm depth. The aggregate weight of fish per size group was approximately 1 kg. The fish were held for 72 h, fed with lab-lab and provided with continuous aeration to allow recovery from stress during transport and handling. After the recovery period, aeration was stopped and 200 g of the fine rice bran was spread over the water in each tank creating a film of bran particles on the water surface. This was designed to speed up depletion of dissolved oxygen considering the combined effects of the screening-off of sunlight, the reduction of air-water interface and the breakdown of the bran particles. It is probable that stress on milkfish in brackishwater ponds could start when oxygen level drops to about 1.4 ppm. A further decrease to 0.04 ppm could produce a total kill of all specimens above 4 grams with marketable size and bigger size fish dying first.