Metazoan parasites of Glossogobius giurus (Hamilton-Buchanan) from Naujan Lake, Oriental Mindoro, Philippines
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Abstract
Thirty-five specimens of Glossogobius giurus (TL = 10.8-23.4 cm, wt. = 8.8-66.3 g) collected from Naujan Lake, Oriental Mindoro from May 1991 to February 1992 were examined for metazoan parasites. The parasite species recovered (their organ location in the host, prevalence (%) and intensity of infection range and mean number of parasites per infected fish) were Neochasmus microvatus (Tubangui, 1928) Tubangui and Masilungan, 1944, (Digenea: Cryptogonimidae), stomach and intestine, 48.6, 1-279 (45.1); Opegaster minima (Tubangui, 1928) Yamaguti, 1934, (Digenea: Opecoelidae), stomach and intestine, 37.1, 1-33 (8.7); larval Diplostomulum sp. Hughes, 1929 (Digenea: Diplostomidae), eyes, 25.7, 1-5 (1.8); and Lernaea cyprinacea L. (Crustacea: Copepoda), skin and muscle, 8.6, 1-2 (13).
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Gobiidae
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Lopez, N. C., & Palisoc, F. (1992). Metazoan parasites of Glossogobius giurus (Hamilton-Buchanan) from Naujan Lake, Oriental Mindoro, Philippines. Transactions of the National Academy of Science and Technology , 14, 307-317. http://hdl.handle.net/10862/6509
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Parasitic crustaceans in fishes from some Philippine Lakes
(Aquaculture Department, Southeast Asian Fisheries Development Center; Philippine Council for Aquatic and Marine Research and Development (PCAMRD), Department of Science and Technology; Bureau of Fisheries and Aquatic Resources, 2001)Parasitic crustaceans are among the most harmful parasites of fishes. Certain species cause disease outbreaks and mortalities in aquaculture, facilities, and sometimes in natural systems, resulting in serious economic losses. Edible fishes from some Philippine lakes also show infestation by parasitic crustaceans. The branchiuran, Argulus indicus Weber, and the copepod, Lernaea cyprinacea Linnaeus, were recovered from the skin and base of the dorsal fin, respectively, of the mudfish Channa striata from Laguna de Bay. L. cyprinacea was also found on the white goby Glossogobius giurus in Naujan Lake. In La Mesa Reservoir, the gills of wild populations of tilapias Oreochromis niloticus and Tilapia zillii, white goby, and silvery theraponid Therapon plumbeus were infected with the copepod, Ergasilus philippinensis Velasquez. An isopod, Alitropus typus Edwards, was recovered from the buccal and gill cavities of several fishes from Lake Taal, namely; the mud gudgeon Ophiocara aporos, cardinal fish Apogon thermalis, silvery theraponid, and cage cultured Oreochromis niloticus. Previous reports and above finding indicate wide host specificity of the parasites. Of these four parasites, only Ergasilus philippinensis has not been reported to cause mass mortality in cultured fishes. Measures should be undertaken to prevent their introduction to other water bodies in which they do not yet occur. -
Incidence and causes of mass fish kill in a shallow tropical eutrophic lake (Laguna de Bay, Philippines)
; ; ; ; Romana-Eguia, Maria Rowena
; ; (Shiga Prefectural Government, 2001)
Mass fish kills in Laguna de Bay, the largest lake in the Philippines, has been reported as early as in the 1930’s. With the introduction of and development of aquaculture in this lake, considerable attention and concern was focused on the problem. Records of mass fish kill in the lake mainly from unpublished sources and reports from fisherfolk were reviewed and the causes categorized. The data covered the period 1972 to 1998. Among the commercially important fish species affected were milkfish (Chanos chanos), Nile tilapia (Oreochromis niloticus), bighead carp (Aristichthys nobilis), snakehead (Channa striata), catfish (Clarias macrocephalus and C. batrachus, Arius manilensis), silver perch (Terapon plumbeus) and goby (Glossogobius giurus). The first three species are widely used in aquaculture and the rest are important in open water fishery. Sixty percent of mass fish kill incidents were due to low dissolved oxygen with more than half of these cases associated with blue-green phytoplankton blooms. Fish kills due to pollution from agriculture and industries, fish pathogens and other causes are also discussed. The incidence of mass fish kill reached its peak between 1977 to 1986. Records show that the most number of fish kills (80%) occurred between the months of May to September. The lakeshore towns in the central arm of the lake had the highest incidence of fish kill reported with 46% and followed by the west arm of the lake with 38% of all fish kills recorded.
