Aquaponics is the science of integrating intensive fish aquaculture with plant production in recirculating water systems. Although ion waste production by f ish cannot satisfy all plant requirements, less is known about the relationship between total feed provided for f ish and the production of milliequivalents (mEq) of different macronutrients for plants, especially for nutrient flow hydropon...

Cage culture plays an important role in achieving higher output and generating more export earnings in Malaysia. However, the cost of fingerlings, feed and labour have increased substantially for cage culture in the coastal areas in Peninsular Malaysia. This paper uses farm level data gathered from Manjung, Perak and Kota Tinggi, Johor to investigate the technical efficiency of brackish water f...

Three thousand years ago, farmers in China began growing fish in freshwater ponds and a thousand years later began cultivating mollusks along coastlines. For centuries, aquaculture—the farming of fish, shellfish, and aquatic plants—remained mostly a small-scale subsistence activity providing relatively low yields. But during the past few decades, aquatic farming has abruptly undergone a startli...

For this study, we performed a parasitological analysis of cage-cultured Nile tilapia (Oreochromis niloticus) from the Água Vermelha Reservoir, Southeastern Brazil, and verified relationships with limnological data, seasonality, and fish growth phase. From March 2010 to March 2011, sixty-three specimens of O. niloticus in three growth phases (i.e., initial, intermediate, and final) were collect...

Farmed fish is the third biggest export in Norway (around NOK 30 billion/e3.82 billion/US$ 5.44 billion in 2010), and large fish farms have biomass worth around NOK 150 million/e19.38 million/US$ 26.72 million. Several processes are automated (e.g. the feeding system), and sensory logging systems are becoming ubiquitous. Still, the key to successful management of a site is the operational knowl...

The sex ratio, gonadosomatic index, stages of gonadal development and fecundity of sompat grunt Pomadasys jubelini off Lagos coast, Nigeria were investigated. P. jubelini had sex ratio of 1: 0.85 (male to female). The difference in sex ratio was not significantly different (p > 0.05) from the expected 1:1 distribution. Gonadosomatic index ranged from 0.07 to 7.29% with mean of 2.25 ± 0.08%. Hig...

In northern Tanzania large numbers of small scale miners use mercury in the gold extraction process causing contamination of the environment and risks to human health. Human exposure to Hg was assessed in populations in and around small scale gold mining camps by means of human hair and urine surveys. We also determined Hg concentration in fish in aquatic bodies close to these camps. Urinary Hg...

When 'mercury' is released into the environment it may appear as, or be converted into, any of the following chemical forms: metallic mercury (Hg) inorganic mercury (Hg + and Hg *) monomethyl mercury (CH3 Hg+) dimethyl mercury (CH3 Hg CH3) The 'methyl mercury' discussed in this appendix is monomethyl mercury (CH3 Hg+) 1. Man (a) Adult (i) Occupational exposure lab personnel industrial workers a...

1. This case study was prepared as part of an Asian Development Bank (ADB) special evaluation study on small-scale, freshwater, rural aquaculture development. The study used primary and secondary data and published information to document the human, social, natural, physical, and financial capital available to households involved in the production and consumption of freshwater farmed fish and t...