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  • 1
    Electronic Resource
    Electronic Resource
    Effects of varying dietary fatty acid profile on growth performance, fatty acid, body and tissue composition of juvenile pike perch (Sander lucioperca) (2005)
    Oxford, UK : Blackwell Science Ltd
    Aquaculture nutrition 11 (2005), S. 0 
    Details
    ISSN: 1365-2095
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Pike perch (Sander lucioperca) has been identified as specie destined to diverse European inland aquaculture, but knowledge on the nutritional requirements is weak. Therefore, we investigated the effect of varying dietary fatty acid (FA) profile by partial replacement of fish oil (FO) with vegetable oils on growth, FA and body composition of juvenile pike perch. An extruded basal diet containing 59 g kg−1 crude lipids (FO) was added with 60 g kg−1 FO, 60 g kg−1 linseed oil (LO) or 60 g kg−1 soybean oil (SO). The resulting dietary FA composition differed mainly in the triglyceride fraction and was characterized by highest amounts of linolenic acid (18:3 n-3) in the LO diet and linoleic acid in the SO diet. Diet enriched with FO contained highest contents of highly unsaturated FA 20:5 n-3 (eicosapentaenic acid) and 22:6 n-3 (docosahexaenic acid). Pike perch were held in a recirculation system and each feeding group (in triplicate) was fed with experimental diets at a daily rate of 35 g kg−1 of biomass for 57 days by automatic feeders. Weight gain and specific growth rate of experimental feeding groups ranged between 18.47 and 19.58 g and 1.37–1.45% day−1 and was not affected by the dietary composition indicating that FO can be replaced by vegetable oils without negative impact on growth performance. In contrast to the whole body and muscle composition, liver tissue was affected by the varying diets. Liver tissues of fish fed diets enriched with vegetable oils showed significantly increased lipid contents of 162 (LO) and 147 (SO) g kg−1 and indicate decreased lipid utilization compared with fish fed FO diet (liver lipid content 112 g kg−1). Nevertheless, hepatosomatic index of pike perch was not influenced by dietary lipid composition. The FA profile of pike perch was generally determined by the dietary FAs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2095.2005.00369.x
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  • 2
    Electronic Resource
    Electronic Resource
    Constructed wetlands with free water surface for treatment of aquaculture effluents (2004)
    Berlin, Germany : Blackwell Verlag GmbH
    Journal of applied ichthyology 20 (2004), S. 0 
    Details
    ISSN: 1439-0426
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: The aim of the study was to determine the reduction of the overall environmental load (in terms of organic and nutrient load) in effluents of a flow-through trout farm. Effluents of a flow-through system for rainbow trout (Oncorhynchus mykiss) production passed through constructed wetlands with free water surface. Removal of nutrients was determined in three wetlands of 350 m2 each at hydraulic residence times (HRTs) of 3.5, 5.5 and 11 h. The areal load of total suspended solids (TSS), chemical oxygen demand (COD), total phosphorus (TP), and total nitrogen (TN) varied in terms of HRTs from 12.3–36.8 g m−2 day−1, 21.7–65.2 g m−2 day−1, 0.23–0.70 g m−2 day−1, and 1.46–4.37 g m−2 day−1. Values for reduction of suspended solids, COD, TP, and TN were 67–72%, 30–31%, 41–53% ,and 19–30%, respectively. Significantly lower nutrient concentrations in the effluent among the wetlands were only found for nitrogen parameters: TN and ammonia concentrations were lower in the wetlands with a HRT of 5.5 h (0.89 mg L−1, 0.11 mg L−1) and 11 h (0.81 mg L−1, 0.11 mg L−1) compared with the one with 3.5 h (0.96 mg L−1, 0.16 mg L−1).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.0175-8659.2003.00520.x
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  • 3
    Electronic Resource
    Electronic Resource
    Water pollution by a land-based trout farm (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of applied ichthyology 10 (1994), S. 0 
    Details
    ISSN: 1439-0426
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: In 1992, wastes from a land-based trout (Oncorhynchus mykiss) farm on a small stream in Brandenburg were investigated. This trout farm consists of 15 basins with a total volume of about 170 m3 using open water recirculation without water purification. The water supply from the stream is about 110 L/s and about 240 L/s are recycled by pumps. In 1991, the total production of rainbow trout was 20 t. Investigations included the discharge of nitrogen, phosphorus, COD and suspended matter resulting from the fish production, measured as the difference between inflow and outflow water. The average daily output was 466 g/t nitrogen, 157 g/t phosphorus, 3145 g/t COD and 30 L/t suspended dry matter. The feed conversion ratio was 1.33 kg/kg gain. These results indicated a reduction in waste discharge by about 53% for nitrogen and 42% for phosphorus compared to previous results in former Eastern Germany.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0426.1994.tb00180.x
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of feeding under-year zander (Sander lucioperca) on size, body mass and body composition before and after wintering (2005)
    Berlin, Germany : Blackwell Verlag GmbH
    Journal of applied ichthyology 21 (2005), S. 0 
    Details
    ISSN: 1439-0426
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Zander (Sander lucioperca) is one of the most important fish species in the German inland fishery. As a pelagic predator, zander is able to regulate populations of small cyprinids and perch and is therefore used in ‘top-down’ projects to directly control the food web. At present, natural waters are mainly stocked with one-summer-old zander from pond hatcheries; however, such fish are poor stocking material due to low survival rates, presumably because of their small size. Two groups of 50-day-old zander fingerlings reared in a recirculation system (T = 23 °C) were used. For 90 days one group (FG 1) was fed with a commercial dry feed (Trouvit Pro Aqua Brut), and the other group (FG 2) was fed with chironomides (Chironomus spp.). The fat content of the dry feed was increased with fish oil supplemented up to 22%. After the rearing period the FG 1 fishes attained the largest size and fat content. A pond with a surface of 667 m2 and a mean depth of 0.8 m was stocked with 24-tagged zander (12 of each feeding group) for wintering. After the winter period of 176 days, survival rate of each feeding group was 83.3%. The fatty acid composition in the membrane lipids of group 2 changed dramatically. In contrast to previous investigations, presented results indicate that the survival rate is not influenced by fish size (weight and length). The crucial factors for high survival rates of zander during wintering are the crude tissue fat content (〉5%) and its fatty acid composition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0426.2005.00665.x
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  • 5
    Electronic Resource
    Electronic Resource
    Product quality in different strains of tench (Tinca tinca) tested under controlled environmental conditions (2003)
    Berlin, Germany : Blackwell Verlag GmbH
    Journal of applied ichthyology 19 (2003), S. 0 
    Details
    ISSN: 1439-0426
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Tench is produced in pond aquaculture in Europe and is highly valued by consumers. However, little is known about the product quality of this species, including body composition and flesh quality which are relevant for processing, storage and marketing. The experimental investigations indicate that tench are favorable in several parameters of body composition, e.g. carcass yield and fillet percentage, when compared with common carp. Organ weights show a trend toward a lower percentage than in other cyprinids. Composition of the tench fillets is similar to that of common carp. However, tench are able to store large amounts of fat on the fillet surface and intramuscularly, significantly affecting the sensorial characteristics. Technological parameters indicate that tench fillet is quite favorable for processing. In most of the samples analyzed, the water-binding capacity of raw muscle was significantly better than in other species. Owing to a high energy content in tench muscle, the post-mortem decrease in pH is very pronounced, which may lead to a rapid autolytic degradation of the tissue. When compared with common carp, tench fillets were favorable in terms of appearance due to a lighter flesh. Large variations in several product quality parameters reflect differences in fish size, age, sex, feeding, and genetic origin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1439-0426.2003.00457.x
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  • 6
    Electronic Resource
    Electronic Resource
    A performance test with five different strains of tench (Tinca tinca L.) under controlled warm water conditions (2003)
    Berlin, Germany : Blackwell Verlag GmbH
    Journal of applied ichthyology 19 (2003), S. 0 
    Details
    ISSN: 1439-0426
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Growth performance tests were carried out with a total of five different strains of tench (Tinca tinca L.) originating from the Czech Republic (4) and Germany (1). Tench larvae and juveniles were reared in closed recirculating systems for 446 to 452 days, respectively. At the end of each test, the tench strains showed differences in performance, e.g. specific growth rates (SGR) from 2.13 to 2.52, feed conversion ratios (FCR) from 1.75 to 3.65 kg feed per kg weight gain, and survival rates from 64.4 to 81.0%. Thus, appropriate strain selection appears to have the potential to remarkably increase productivity of the species. The highest SGR was observed in the Vodnany 96 strain in the first trial and the best FCR in the Tabor strain in the second trial. However, the rearing conditions in the recirculating systems were not optimal for tench; many fish with deformed bones (head, fins, spine) were observed in all strains, particularly in the faster-growing strains.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1439-0426.2003.00464.x
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  • 7
    Electronic Resource
    Electronic Resource
    Digestibility measurements in juvenile tench [Tinca tinca (L.)] by using a continuous filtration device for fish faeces (2003)
    Berlin, Germany : Blackwell Verlag GmbH
    Journal of applied ichthyology 19 (2003), S. 0 
    Details
    ISSN: 1439-0426
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Effective pond production of tench [Tinca tinca (L.)] requires the use of formulated diets. However, insufficient information is available regarding the nutrition of this species. Therefore, for the first time, the digestibility of macronutrients by tench was investigated using a sieving method of faeces collection and chromic oxide. A pelleted experimental diet rich in untreated wheat starch revealed the following mean apparent digestibility coefficients (ADCs): dry matter 77.2%, crude protein 89.4%, crude fat 94.3%, ash 30.5%, nitrogen-free extracts 78.2%, organic matter 83.3% and energy 85.1%. Generally, these ADCs indicate that the ability of tench to digest the macronutrients from pelleted feed correlates with reports of other fish species. However, the tench is more able to digest untreated wheat starch than are carnivorous and coldwater fish species. Compared with carp (Cyprinus carpio L.), the digestibility of untreated wheat starch is less in tench. The faeces sieving method as described in this paper is a useful procedure for further digestibility trials with tench. However, compared with the approach presented here, several adaptations are recommended, e.g. long adaptation times to the rearing facility, high stocking densities, usage of more waterproof food pellets and the addition of formalin to the collection pans.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1439-0426.2003.00463.x
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  • 8
    Electronic Resource
    Electronic Resource
    Juvenile growth of Acipenser ruthenus and 4 different sturgeon hybrids (1999)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of applied ichthyology 15 (1999), S. 0 
    Details
    ISSN: 1439-0426
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Juvenile growth of A. ruthenus and four different sturgeon hybrids (Huso huso x A. ruthenus, A. baerii x A. ruthenus, A. gueldenstaedtii x A. ruthenus, A. gueldenstaedtii x H. huso) was studied for 71 days applying two feeding regimes, offering a fry diet (3.5 % daily rate) for 26 days for the hybrids and 41 days for A. ruthenus and a fattening diet (3 % daily rate) for 45 days and 30 days respectively. Significant growth differences occured at the end of experiment: The hybrid A. gueldenstaedtii x H. huso showed the highest, A. ruthenus the lowest growth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0426.1999.tb00244.x
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  • 9
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    A new concept for aquaponic systems to improve sustainability, increase productivity, and reduce environmental impacts (2015)
    Inter-Research
    Details
    Publication Date: 2015-10-07
    Print ISSN: 1869-215X
    Electronic ISSN: 1869-7534
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Inter-Research
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