Abstract: The purpose of this paper is to review the performance of fisheries sector in Bangladesh and the challenges it is facing. Data and information were sourced from the publication of the Department of Fisheries (DoF) and related non-published grey literature. Bangladesh is predominantly an agrarian economy and is naturally endowed with a huge sweet water resources and the world's longest continuous sea beach. With the world's largest flooded wetland, the third largest aquatic biodiversity in Asia behind only to China and India, Bangladesh is considered as one the most suitable region for aquaculture and fisheries in the world. The country has an inland water area of about 45,000 km2 and about 710 km long coastal belt. Given this extensive water resource, it is evident that fisheries play an important role in the economy and the diet of the population. Fish and fish products supply 60 percent of animal protein and around three percents of total export earnings. In recent years, however, the fisheries sector is confronted with challenges posed by numerous natural and anthropogenic causes such as climate change, natural disasters, unbalanced urbanization and industrialization, overfishing and environmental pollution. The combined effect of these factors is posing significant threat to the income and food security of the population and urges for immediate actions by government and policymakers.
Abstract: Length-Weight Relationships (LWR) is presented for females of the half-smooth tongue sole Cynoglossus semilaevis, a fish species in Shandong peninsula, China. A simple method for distinguishing males from females was introduced.
That Dang and Chunbo Zhang*
Abstract: External morphological changes along lake sturgeon postembryonic development from hatching to year-0 juvenile were described. We also provided data for the growth of the olfactory bulb and telencephalon during the period based on micrographs of confocal imaging. By the time of hatching, yolk-sac larvae were approximately 1 cm long with many features corresponding to the pharyngula period of zebrafish embryos. Larval Stage started with the beginning of exogenous feeding when fish snout was flattened and specialized into triangular-shaped rostrum. By then, the larvae were approximately 2 cm in size, the time that the forebrain of sturgeon larvae differentiated to telencephalon and diencephalon. Sturgeon larvae transformed their eel-like body into spindle-shaped trunk armored with five rows of scutes at late Larval Stage. Juvenile Stage began with completion of transformation of the ray-fin in the tail and disappearance of fin folds when fish were over 4 cm. By 7-8 cm long, pigment distributions resembled that in adults. In early Juvenile Stage, the olfactory bulb reduced it's widthwise expansion pace while maintained longitudinal growth. Anatomical features of the olfactory bulb stabilized in fish larger than 5.5 cm. Quantitative data indicated a steady longitudinal growth of the telencephalon during the period examined while an increase in width slowed down after fish reached 5.5-6.5 cm. The data suggest that the forebrain development is most active in fish smaller than 5.5 cm. This time period included two vulnerable phases for fish transform themselves into new developmental stages. Our study has provided valuable information for future research and fisheries of lake sturgeon.
Li Lin1,2,3,4 and Weimin Wang3
Abstract: Substantial published evidence supports the notion that besides the O2/CO2 exchange, gill is also a dominant site of ammonia excretion of fish. Therefore, fish gill plays lung-kidney dual functions of human beings. Comparison of traditional Chinese medicine and fish medicine shows that fish gill occupies " Metal" and "Water" elements which are generating interaction relationship in the "Wu-xing ring", indicating that the dual functions are closely related. The dual functions are also supported by the observations that many diseases associated with gill normally cause pulmonary-renal syndromes of fish.
Nicole L. Jacobs-McDaniels*
Abstract: As the human population has exceeded 7 billion, consumption of animal products is at an all time high. Most of our commercial fish stocks are overexploited, recovering, or depleted, so we have turned to aquaculture to produce fish and other seafood for human consumption. Currently, about half of all seafood marketed for human consumption is a product of aquaculture. The idea of combining aquaculture and hydroponics has increased in popularity. This method, called aquaponics, uses the water from fish pools to grow plants in a controlled environment. The waste from the fish is converted to nutrients for the plants. The plants filter the water for the fish. Aquaponics is a sustainable way to produce fish proteins and fruits or vegetables for human consumption. As a science professor teaching a non-majors science course entitled Conservation and the Environment at Herkimer College in Herkimer, NY, I felt it was my responsibility to make my students more interested and aware of their environment. One way I did this was by assigning an aquaponics project among other aquaponics activities. Aquaponics appealed to a wide variety of students because it is based on science, but also has important business and economic value. Students generally not interested in careers in science were educated on an innovative type of farming. Education is the key to awareness and action. Educating community college students on aquaponics is one step in helping to keep our fish populations plentiful and our world healthy and sustainable.