Floating cage nursery for tiger prawn
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de la Peña, D. T., Jr., Prospero, O. Q., & Young, A. T. G. (1985). Floating cage nursery for tiger prawn. Tigbauan, Iloilo, Philippines: Aquaculture Department, Southeast Asian Fisheries Development Center. http://hdl.handle.net/10862/225
PublisherAquaculture Department, Southeast Asian Fisheries Development Center
SeriesAquaculture technology module / SEAFDEC Aquaculture Department; No. 3
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Conference paperA Gicos - In CT Villegas, MT Castaños & RB Lacierda (Eds.), Proceedings of the Aquaculture Workshop for SEAFDEC/AQD Training Alumni, 8-11 September 1992, Iloilo, Philippines, 1993 - Aquaculture Department, Southeast Asian Fisheries Development CenterThe major commercial shrimp species in the Philippines belong to the genus Penaeus and Metapenaeus. The important penaeid shrimps are: P. monodon (giant tiger shrimp or sugpo); P. japonicus and P. semisulcatus (tiger shrimp and bulik or sugpo); and P. merguiensis and P. indicus (white shrimp and Indian white shrimp or putian). The giant tiger shrimp is the major species cultured in ponds while the others are incidental crops. There are 210,000 ha of potential and existing brackishwater ponds in the Philippines (Fig. 1). Because most of these are underdeveloped, present technologies are aimed at improving production or encouraging the development of new areas. Brackishwater fishfarming in the country is primarily centered on milkfish (Chanos chanos) (Table 1). Shrimp used to be merely an incidental crop when postlarvae from the wild enter the milkfish ponds. In the last decade, many traditional milkfish growers recognize the market of shrimps, primarily the giant tiger shrimp. Polyculture of milkfish and shrimp was practiced, and the fishfarmers shifted to shrimp monoculture when price of shrimp in the international market went up. In the mid-70s, SEAFDEC/AQD developed and extended its shrimp hatchery technology, and hatcheries proliferated throughout the country. Seed supply became abundant, encouraging more people to invest in grow-out culture. However, production remained low and inconsistent since the growout technology remains largely an art. When Taiwanese grow-out technology was introduced in the country and research in shrimp was intensified in the Department of Agriculture, University of the Philippines, and SEAFDEC/AQD, new coastal areas were developed particularly in Negros Island where vast tracts of sugarland and rice land were converted to shrimp ponds. Milkfish ponds were also renovated for shrimp culture. There are four shrimp culture levels in the country, namely: traditional, extensive, semi-intensive, and intensive which vary mainly in pond design, stocking density, feeds and feeding, and water management (Table 2). Only the semi-intensive and intensive culture systems are discussed.
Conference paperJH Primavera & RV Caballero - In PM Aliño (Ed.), Proceedings of the Second National Symposium in Marine Science, 5-7 November 1992, Mindanao State University, Tawi-tawi, Philippines, 1994 - University of the Philippines, Marine Science InstitutePond-reared Penaeus monodon males and females were sampled regularly over a 4 month period of length and weight measurments to the body and external reproductive organs; joining of the petasmata and the presence of sperm in the spermatophores and thelyca were also noted. Astrong linear relationship exists between body weight and length parameters, and between size of thelycum/petasma and carapace length (CL). Both the unification of petasmal endopodites and sperm presence in the spermatophores in males were first observed at Day 121 from stocking (CL 26.4 mm) while sperm was first noted in the thelycum of females at Day 125 (CL 28.6 mm). Male P. monodon with unified petasmata. In general, size were not significantly different between males and females over the culture period.
Conference paperThe effect of molting on osmotic, chloride, calcium and total protein concentrations in the hemolymph of the shrimp Penaeus monodon was investigated. Regardless of medium salinity, tissue water as well as osmotic and chloride concentrations in the hemolymph became stable within one day after molting. In general, total protein concentrations remained stable throughout the molting cycle. Large fluctuations in hemolymph calcium were observed 0-6 hours after molt. In low salinities, hemolymph calcium peaked at 3 hours postmolt to values 30% higher than those during molt. These values subsequently decreased rapidly one after molting, when hemolymph concentrations achieved intermolt values. At 44 ppt, calcium concentrations were highest during molt, then gradually declined by about 15% to intermolt values.