This study monitored the present status ofPenaeus monodon post larvae （PL.） of Kholpatua river in Satkhira. The survey was conducted in Kholpatua river from January 2014 to December 2014 and was compared with the te...This study monitored the present status ofPenaeus monodon post larvae （PL.） of Kholpatua river in Satkhira. The survey was conducted in Kholpatua river from January 2014 to December 2014 and was compared with the ten years old secondary data. The results showed that there was a 41.57% decrease in number of catches ofP. monodon PL. over the course of time from ten years ago to the year of 2014. Although the number of active fishermen＇s boats have increased from 250 to 360 in ten years. The study also showed that the severe shrimp seed collection activities reduced the availability ofP. monodon PL. at Satkhira district, which has a severe negative impact on the availability of total catches. To control such decrease of P. monodon PL. in Bangladesh, more intensive study should be done.展开更多
A laboratory-based work was conducted on development, biometry （cyst diameter, hatching efficiency and hatching percentage） and survival rate of Artemia franciscana at 35 ppt using natural brine water under constant...A laboratory-based work was conducted on development, biometry （cyst diameter, hatching efficiency and hatching percentage） and survival rate of Artemia franciscana at 35 ppt using natural brine water under constant aeration facilities. The experiment was carried out for both chorionic and decapsulated cysts. There was a significant increase in hatching output of the decapsulated cysts than the chorionic cysts. The survival rate was counted only for the chorionic cysts because nauplii hatched from decapsulated cysts died after four days of incubation before reaching the adult stage. Untill now the Artemia cysts are imported from abroad. Though the prospect of mass production of Artemia in Bangladesh is feasible but there needs to be more studies done.展开更多
文摘This study monitored the present status ofPenaeus monodon post larvae （PL.） of Kholpatua river in Satkhira. The survey was conducted in Kholpatua river from January 2014 to December 2014 and was compared with the ten years old secondary data. The results showed that there was a 41.57% decrease in number of catches ofP. monodon PL. over the course of time from ten years ago to the year of 2014. Although the number of active fishermen＇s boats have increased from 250 to 360 in ten years. The study also showed that the severe shrimp seed collection activities reduced the availability ofP. monodon PL. at Satkhira district, which has a severe negative impact on the availability of total catches. To control such decrease of P. monodon PL. in Bangladesh, more intensive study should be done.
文摘A laboratory-based work was conducted on development, biometry （cyst diameter, hatching efficiency and hatching percentage） and survival rate of Artemia franciscana at 35 ppt using natural brine water under constant aeration facilities. The experiment was carried out for both chorionic and decapsulated cysts. There was a significant increase in hatching output of the decapsulated cysts than the chorionic cysts. The survival rate was counted only for the chorionic cysts because nauplii hatched from decapsulated cysts died after four days of incubation before reaching the adult stage. Untill now the Artemia cysts are imported from abroad. Though the prospect of mass production of Artemia in Bangladesh is feasible but there needs to be more studies done.
