Showing papers in "Aquacultural Engineering in 1998"

TL;DR: The proceeding literature review details sources of nitrogenous fish waste and peculiarities of the Nitrobacteraceae family, including survival mechanisms, frailties, and intrinsic kinetics, as is the implication of reducing power allotment for respiratory efficiency.

TL;DR: The purpose of this article is to summarize the ‘state of the art’ of mechanical aeration of aquaculture ponds and identify the most common and usually the most effective means of increasing dissolved oxygen concentrations in ponds.

TL;DR: A pilot-scale system for the intensive land-based culture of abalone was established using an integrated design aimed at eliminating the dependence on external food sources, whilst reducing water requirements and nutrient discharge levels, towards commercial application of the concept.

TL;DR: The implementation of continuous production and satiation feeding strategies within circular culture tanks is discussed because of their large and often under-emphasized effect on overall system productivity.

TL;DR: The study failed to show any relationship for either type of filter between the hydraulic loading rate and the nitrification rate at hydraulic loading rates between 469 and 1231 m3 m−2 day−1.

TL;DR: It is concluded that sea bass, within the range of stocking densities tested and at least at its early stages, does not belong to that fish category which is characterised by an inverse correlation between stocking density and growth rate.

TL;DR: The use of a non-toxic cyanobacterium, Phormidium bohneri, to remove dissolved inorganic nutrients from fish farm effluents is investigated and the potential use of P. bohNERi as an alternative for the tertiary treatment ofFish farm effluent is analyzed.

TL;DR: Results from multi-phase growout are most promising and indicate that this may be a suitable mechanism to optimize biomass loading of the culture system, and warrant further economic and marketing evaluations.

TL;DR: Three feeding strategies for white shrimp farmed in earthen ponds were evaluated in an experimental study conducted during 15 weeks at Bahia Kino, Sonora, northwestern Mexico, with mixed results.

TL;DR: Analysis of the data obtained has shown that the model sufficiently explains and predicts the ammonium removal rate of a wide range of commercial trickling filters, and is used to optimise performance of existing biofilters in terms of ammonium levels achieved and pumping costs.

TL;DR: A bacterial strain (SK-05), selected for its active growth in organic-poor substrates and inoculated in a Skeletonema costatum culture in late exponential growth, prevented the establishment of Vibrio alginolyticus, purposely introduced into the diatom culture.

TL;DR: In this paper, a set of empirical equations are presented modeling the performance of a 5.08-cm (2.2") diameter air-lift submerged 91.44 cm (36″) with a 15.24 cm (6″) lift operated at 28-142 l min −1 (1-5 scfm) of air injection.

TL;DR: Compared with previous models, this study provides a more reasonable and accurate way to estimate relative feeding level (f) based on fish standing crop and potential net primary productivity derived by a limiting nutrient.

TL;DR: Results show that the recirculating system could be used for P. monodon culture and the survival rates were 89±6, 76±2 and 60±0%, respectively.

TL;DR: The GPS model advanced in this paper describes the evolution of various heat and water vapor transfer fluxes, temperature and humidity at a given site under various climatic conditions and can provide a useful tool for optimum control of water temperature and evaluation of the economic potential for the active GPS.

TL;DR: Observations of subsurface and surface feeding activities were recorded on salmon farms that utilised a variety of feeding techniques and pellet wastage were recorded as indicators of uniform feeding and efficiency.

TL;DR: In this article, a model for oxygen consumption of Atlantic salmon including body weight, temperature, and swimming speed was developed, and a multiregression analysis of 157 measurement periods on six different fish was performed.

TL;DR: In this article, a water budget simulation model that can be used for forecasting water requirements for aquaculture ponds has been developed and validated for ponds located at the Asian Institute of Technology (AIT), Thailand and at El Carao, Honduras which are, respectively, located in the humid and dry tropics.

TL;DR: Results demonstrate the interrelatedness of abiotic and biotic factors in fish culture and the ability to control fish behavior, growth and metabolism through the alteration of several physical and biological variables in the rearing unit.

TL;DR: In this article, a flat-plate passive integrated transponder tag interrogation (PIT tag) system was installed at the terminus of the downstream migrant (DSM) channel of the Bonneville Dam First Powerhouse, located on the Columbia River.

TL;DR: Fish images were captured using stereo cameras and analyzed using a previously developed fish-sizing computer programme (FICASS) to examine the effect of sampling position within a swimming aggregation on the mean fish mass within commercial-sized cages.

TL;DR: A laboratory-scale recirculating aquaculture system for fluidised bed biofilter evaluation was engineered, allowing both pre- and post-filter measurements of various water quality criteria, and proved to be an exceptional set-up for evaluation of the performance of fluidisation bed biofilters.

TL;DR: Ammonia production rates of white sturgeon (Acipenser transmontanus) were measured at three commercial farms in the Sacramento, California area as mentioned in this paper, where the mean daily ammonia-nitrogen production (RNH3) values ranged from 1.5 to 27.6 mg total ammonia-TAN (kg fish)−1 h−1 for sturgeons ranging in size from 0.09 to 3.8 kg.

TL;DR: To develop a novel yeast diet, production of Kluyveromyces fragilis has been carried out in aerobic continuous culture with a 2.5% fructose medium and the protein content of the yeast biomass was 50–55% at all dilution rates studied.

TL;DR: Three feeding trials with rainbow trout were run in a closed recirculating aquaculture system with a nitrification unit and a sedimentation tank, and the effects of different protein contents of the feeds and different sludge removal intervals on the nitrogen loading of the culture water were examined.

TL;DR: A hydraulically integrated, serial turbidostat algal reactor (HISTAR) was mathematically modeled and developed for the mass production of microalgae in this paper, where the authors investigated the effects of system dilution rate, D s ; net algal specific growth rate, U a ; number of reactors, N ; input algal biomass, X i ; and contaminant concentration, C n, on algal productivity, as well as local dilution rates, D n, on suspended contaminant washout.

TL;DR: In this paper, a sediment survey and a field experiment using indicator particles in fish feed were performed in Lake Southern Bullaren, Sweden, which had a fish farm producing ≈500 tons/year in the early 1990s.

TL;DR: A partial flow-through culture system for larvae of the blacklip pearl oyster requires less labour and is likely to be more appropriate for hatchery culture in developing Pacific nations.

TL;DR: In this article, the authors test if phosphorus from fish farms increases annual total phosphorus (TP)-concentrations in lakes (C-TP) and show that the expected increase in C-TP is small.

TL;DR: Method evaluations in intensive shrimp culture ponds suggest that simple electrometric methods are a good index of water column microbial activity under a range of conditions.