Investigation on Suitable Spat Collectiors and Culture Sites for Edible Oyster in the Coast of Bay of Bengal, Bangladesh

Potential spat collectors and suitable culture sites were investigated for the development of edible oyster culture from June to December 2019 at three study sites (Moheshkhali, the Jeti of Nuniarchora, and Sonadia) of Cox’s Bazar coast of Bangladesh. Four types of collectors such as oyster shell, earthen pot, kortal (windowpane oyster shell) and tiles were investigated. On site sampling of water quality parameters and number of spats on each collector were done at 15-days interval following standard methods. Results indicated insignificant difference (P > 0.05) in temperature, salinity, dissolved oxygen and pH, while significant difference (P < 0.05) in total dissolved solids, total suspended solids and Chl-a content of the water among the study locations. However, these parameters were in suitable range for growth and spawning of oyster. Results also indicated spat recruitment was significantly influenced by the types of collectors and study locations with significantly (P < 0.05) higher spat were recruited in Tiles. Tiles were also found to facilitate with an advantage of recycling of this collector. The location in interaction with polluting materials such as total dissolved solids and total suspended solids had a significant effect on spat recruitment rate and therefore, Sonadia was the most suitable location for spat recruitment. This study site can also be used as a suitable location for the development of oyster culture in the cost of Bay of Bengal, Bangladesh based on its environmental characteristics. Bangladesh J. Zool. 49 (2): 257-265, 2021

First Evidence of Ommochromes in Bivalves: the Case of the Edible Oyster Crassostrea Gigas

Among the great variety of pigments found in living beings in general, and more particularly in molluscs, the ommochromes are a family of unknown organic dyes and until now still too little studied. Several lines of physicochemical and structural evidence allowed us here to complete the composition of the purple colour of shell patterns of Crassostrea gigas, highlighting an intriguing association of ommochromes and porphyrins, corroborated by the presence of known genes associated with their biosynthetic pathways. We describe here our pathway to demonstrate for the first time the presence of ommochromes in a bivalve.

Bioconversion of Agro-Waste to Product of Bio-protein via Cultivation of Edible Oyster Mushroom Pleurotus eryngii

This study investigated the potentiality of utilizing some local Agro-wastes (lignocellulose) in Iraq as growing Substrate to product edible oyster mushroom Pleurotus eryngii. Biological process of cultivation and Production edible mushrooms on sold state fermentation its considering a biotechnology Product of Bio-protein or myco-protein, so we used nine substrate combinations (nine Treatment) from plant residues which were Three main substrate (Date palm wastes, Corn cobs and Common reed) and two type of enrichments Supplement (Rice husks and Corn seeds husks) and Without Supplement (control) included, this Experimental data were analyzed using One-way analysis of variance (ANOVA), according to a completely randomized design (CRD) and Tukey’s test P 0.05. The less period of crop cycle (day) which in T7 and T8 (30.33, 31.67 day) when T2 (Corn cobs 100%), T1 (Date palm waste 100%), T7 (Date palm waste 80%+Corn husks 20%) and T8 (Corn cobs 80%+Corn husks 20%) gave the maximum mushroom yield reached 293.0 280.7, 268.7 and 264.0 g kg-1 substrate Sequentially and this yield was significantly different to those found from the other substrate combinations. Bioeffeincy Significant different compared with other combination substrate.