Development of Crassostrea belcheri (Sowerby, 1871), Crassostrea iredalei (Faustino, 1932) and inter-specific cross spats at different salinity
Hybrids between Crassostrea belcheri (CB) and C. iredalei (CI) were produce to evaluate their aquaculture potential. These inter and intra-specific crosses consisted of CB♀XCB♂, CI♀XCI♂, CB♀XCI♂ and CI♀XCB♂. To evaluate their environmental preferences, the spats of 40 day-old were cultured in 10, 20 and 30 ppt for 30 days. Hybrids showed significantly higher (p<0.05) shell increment when cultured in 20 ppt compared to its parental crosses. Subsequently, a short salinity stress experiment was conducted using spat of 140 day-old in 10, 15, 20, 25 and 30 ppt for 10 days. Then followed by the experiment salinity decrements with gradual, intermediate and rapid salinity decrease were carried out on 140 day-old spats for 10 days. In these two experiments, spats of 140 day-old were able to tolerate the different treatments tested evident with the 100% survival for all treatments.
Occurrence of Hemic Neoplasia in Slipper Oyster, Crassostrea iredalei (Faustino, 1928), in Dagupan City, Philippines
Cases of hemic neoplasia in the Philippine slipper oyster (Crassostrea iredalei) have been confirmed from a one-year histology-based disease survey conducted in Dagupan City. Samples were collected on a quarterly basis from the BFAR-NIFTDC demonstration farm and processed for histopathology. Slides were stained with hematoxylin and eosin (H & E) or Feulgen picromethyl blue (FPM) as required. Of...متن کامل
The effects of salinity on the embryonic and larvae stage of Crassostrea iredalei were investigated. Fertilised eggs and one day old D-larvae were subjected to salinities ranging from 0 to 30 ppt at temperature of 30±2°C. At salinity lower than 10 ppt, 100% mortality was observed. For embryo development, the highest survival was observed at salinity 25 ppt with 80.9±2.2% survival with no signif...متن کامل
Assessment of Temperature Effects on Early Larval Development Survival of Hatchery-reared Tropical Oyster, Crassostrea iredalei.
The influence of the cool and warm temperatures on early life development and survival of tropical oyster, Crassostrea iredalei was studied. D-hinged larvae (day 1 larvae) were reared to three different temperatures (20°C, 27°C, and 34°C) for nine days. Oyster larvae reared in temperature 27°C, acted as control (ambient temperature). The highest survival rate occurred when the larvae were reare...متن کامل
The hemolymph of oyster Crassostrea belcheri was found to possess significant antibacterial activity against Vibrio harveyi, V. vulnificus and V. cholerae. Hemolymph was partially purified by gel filtration chromatography on Sephacryl S-200 and fractioned into four parts: P1, P2, P3 and P4. The P3 showed the highest antibacterial activity against V. parahaemolyticus, V. cholerae, V. alginolytic...متن کامل
Transcriptomic analysis of Crassostrea sikamea × Crassostrea angulata hybrids in response to low salinity stress
Hybrid oysters often show heterosis in growth rate, weight, survival and adaptability to extremes of salinity. Oysters have also been used as model organisms to study the evolution of host-defense system. To gain comprehensive knowledge about various physiological processes in hybrid oysters under low salinity stress, we performed transcriptomic analysis of gill tissue of Crassostrea sikamea ♀ ...متن کامل
Scientific names: Crassostrea gigas (Thunberg 1793), Ostreidae, Bivalvia Synonyms: Gryphaea angulata Lamarck 1819; Ostrea gigas Thunberg 1793; Ostrea laperousii Schrenk 1861; Ostrea talienwhanensis Crosse 1862. Note: The Portuguese oyster Crassostrea angulata is a name often used for this species. According to genetic studies it was shown that Crassostrea angulata is likely a strain of Crassost...متن کامل
دوره 6 شماره 1
صفحات 77- 87
تاریخ انتشار 2019-07
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