The effect of micro algal diet and rearing condition on gonad maturity, fecundity and embryonic development of the window-pane shell, Placuna placenta Linnaeus.
MetadataShow full item record
Cited times in Scopus
Immature Placuna placenta (Linnaeus) broodstock were given the micro algae Isochrysis galbana (T-ISO) Parke and Tetraselmis tetrahele (G.S. West) at different combinations and density levels and reared in tanks with or without mud substrate. The animals were also reared in the estuary and fed on available natural food. Monthly examination of gonad histology showed a significantly higher gonad index in broodstock reared in tanks with mud substrate than without (P < 0.05). In addition, those given a high-density algal diet (200,000 cells ml−1, 3:1 mixture of I. galbana and T. tetrahele) had a significantly faster gonad development than the low-density diet (100,000 cells ml−1, 1:1 mixture) fed broodstock reaching sexual maturity and gonad index of 330±14 after 1 month (P < 0.0001). P. placenta given the low-density algal diet attained gonad maturity after 3 months and estuary-reared animals after 2 months. Seawater irradiated by ultraviolet light (925–1395 mW h/l) induced spawning of all mature P. placenta. Estuary-reared animals had a higher fecundity and larger eggs and a higher percentage of fertilized eggs developed to straight-hinged larvae than those reared under other condition. Animals given a low-density algal diet released low number of small eggs which did not fertilize. Natural spawning also occurred in the estuary 2 months after stocking.
Suggested CitationMadrones-Ladja, J. A., dela Peña, M. R., & Parami, N. P. (2002). The effect of micro algal diet and rearing condition on gonad maturity, fecundity and embryonic development of the window-pane shell, Placuna placenta Linnaeus.
- AQD Journal Articles 
Showing items related by title, author, creator and subject.
Carlos, Manuel H.; Santiago, Corazon B. (Aquaculture Department, Southeast Asian Fisheries Development Center, 1988)Most researches conducted at the Binangonan Freshwater Station of the SEAFDEC Aquaculture Department were directed toward enhancing growth and survival of the young tilapia and carp in the nursery as well as increasing ...
Broodstock management and seed production of the rabbitfish Siganus guttatus (Bloch) and the sea bass Lates calcarifer (Bloch) Duray, Marietta N.; Juario, Jesus V. (Aquaculture Department, Southeast Asian Fisheries Development Center, 1988)This paper reviews results of studies conducted on the rabbitfish, Siganus guttatus (Bloch) and the sea bass Lates calcarifer (Bloch) at the Aquaculture Department of the Southeast Asian Fisheries Development Center. Studies ...
Marte, Clarissa L. (Aquaculture Department, Southeast Asian Fisheries Development Center, 1988)Milkfish (Chanos chanos Forsskal) remains one of the cheapest sources of protein for developing countries in Southeast Asia, particularly in the Philippines. The unpredictable supply of wild fry, the only source of seed ...