Browsing Quarterly Research Reports by Title
Now showing items 66-85 of 125
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Laboratory breeding of the mud crab Scylla serrata (Forskal) through the zoea and megalopa stages to the crab stage
(Aquaculture Department, Southeast Asian Fisheries Development Center, 1977)A series of experiments is being conducted to establish breeding techniques to mass-produce seedlings of S. serrata for pond cultivation to meet the commercial demand for the crab. The objective is to culture the crab ... -
Land-based mass production of prawn (Penaeus monodon Fabricius) spawners
(Aquaculture Department, Southeast Asian Fisheries Development Center, 1977)The first spawnings were obtained 12 days after ablation with 4 spawners yielding 784,000 eggs and a harvest of 250,000 P10 fry. Survival of females after 1 month was approximately 30%. Mortalities were mostly ... -
Larval and postlarval development of the window-pane shell, Placuna placenta L. (Bivalvia: Placunidae)
(Aquaculture Department, Southeast Asian Fisheries Development Center, 1979)Stages of development of P. placenta from the straight-hinge veliger to the adult are described. Mature larvae metamorphose at lengths from 220-230 m. Larvae probably attach byssally to the water surface at metamorphosis ... -
Mass production of Penaeus monodon Fabricius juveniles in earthen nursery ponds
(Aquaculture Department, Southeast Asian Fisheries Development Center, 1979)Different culture techniques were tried for rearing larvae of Penaeus monodon , in order to obtain preliminary data on stocking density, water management, fertilization versus feeding and effect of different types of ... -
Methods of harvesting and preservation of the diatom Chaetoceros calcitrans
(Aquaculture Department, Southeast Asian Fisheries Development Center, 1977)Diatom culture and larval feeding experiments were conducted to test the viability and acceptability of preserved algal concentrates. C. calcitrans is characterised by the presence of setae which keep them suspended in ... -
Milkfish fry occurrence pattern in two localities along the Western Coast of Panay Island
(Aquaculture Department, Southeast Asian Fisheries Development Center, 1978)The results are presented of a study of milkfish fry occurrence in the Philippines, namely at Magaba and at Tubog. There were 2 peaks of fry occurrence in the latter, one in May and another in October, whereas only one ... -
Minimum dissolved oxygen tolerance of four different sizes of milkfish
(Aquaculture Department, Southeast Asian Fisheries Development Center, 1978)Four 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 ... -
Notes on ovarian rematuration of ablated sugpo (prawn) Penaeus monodon Fabricius
(Aquaculture Department, Southeast Asian Fisheries Development Center, 1977)To what extent spent P. monodon females can remature and spawn successive broods is an important question in terms of recycling spawners in a commercially viable operation. Corollary to this is the quantity and quality of ... -
Notes on the construction of 12 cu m ferrocement maturation tank for prawn broodstock
(Aquaculture Department, Southeast Asian Fisheries Development Center, 1978) -
Notes on the external sex characters of Chanos chanos Forskal spawners
(Aquaculture Department, Southeast Asian Fisheries Development Center, 1977)In this study, the authors did not find any visible differences between the sexes with reference to external features such as coloration, shape of head, snout and operculum, presence of tubercles or nasal pores, length, ... -
Notes on the induced maturation and spawning in four-month-old Penaeus monodon Fabricius by eyestalk ablation
(Aquaculture Department, Southeast Asian Fisheries Development Center, 1977)The ablation technique consisted of making an incision across the eyeball to allow free flow of fluids while holding the prawn under water, squeezing the eyeball contents outwards, and pinching hard the eyestalk tissue. ... -
Notes on the pigmentation pattern in the larval developmental stages of laboratory-reared milkfish
(Aquaculture Department, Southeast Asian Fisheries Development Center, 1978)Milkfish fry were artificially bred and reared in the laboratory and the pigmentation pattern of the different developmental stages of the larvae are described in detail, with illustrations. -
Observations on the artificial fertilization of eggs and larval rearing of the grey mullet, Mugil cephalus L.
(Aquaculture Department, Southeast Asian Fisheries Development Center, 1978)The results are presented of attempts to artificially fertilize Mugil cephalus eggs in the Philippines. Embryonic development is outlined and rearing of the larvae described. Mass mortality occurred during week 3 of rearing. -
Occurrence of milkfish, Chanos chanos (Forsskal) eggs around Panay Island, Philippines
(Aquaculture Department, Southeast Asian Fisheries Development Center, 1979) -
Optomotor reaction of milkfish larvae and juveniles
(Aquaculture Department, Southeast Asian Fisheries Development Center, 1979) -
Organic pollution in culture water resulting from excess feed and metabolite buildup
(Aquaculture Department, Southeast Asian Fisheries Development Center, 1977)Penaeus monodon postlarvae were subjected to increasing feed concentrations and their growth and survival rates were recorded. Measurements were made of dissolved organic matter, and ammonia and nitrite-nitrogen concentrations. ... -
Polyculture of milkfish (Chanos chanos) and mud crab (Scylla serrata) at two stocking densities
(Aquaculture Department, Southeast Asian Fisheries Development Center, 1980)Mud crabs (Scylla serrata) were cultured singly and in combination with milkfish (Chanos chanos) to compare growth, survival and production rates. Net production of crab was higher in polyculture than monoculture, but the ... -
Polyculture of milkfish (Chanos chanos) and tiger prawn (Penaeus monodon Fab.) with and without supplemental feeding
(Aquaculture Department, Southeast Asian Fisheries Development Center, 1980)Twelve 1,000 m2 earthen ponds were used to compare the growth rates, survival and production of milkfish (Chanos chanos) and prawn (Penaeus monodon) in monoculture and polyculture systems in shallow brackishwater ... -
Preliminary biological evaluation of some formulated feeds for P. monodon
(Aquaculture Department, Southeast Asian Fisheries Development Center, 1977)Rice bran is widely used by fish farmers as supplementary feed while soybean cake is used both as feed and as fertilizer in fishponds. Both fish meal and shrimp head have been found acceptable as feed ingredients. However, ... -
Preliminary chemical and physical evaluation of some formulated feeds for P. monodon
(Aquaculture Department, Southeast Asian Fisheries Development Center, 1977)The culture of Penaeus monodon has explicitly defined the need for diet formulations or supplementary feeds that would promote optimum growth and survival of the animal. A total of 28 feed combinations were developed for ...