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  • 1
    Electronic Resource
    Electronic Resource
    Measuring ecological stress: Variations on a theme by R.M. Warwick (1990)
    Springer
    Marine biology 106 (1990), S. 305-308 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Two new indices are presented which reflect quantitatively the changes to be expected in an ecological community under stress, as previously described by R. M. Warwick. The indices summarize information which he presented graphically, and permit analyses of trends and inferential tests. We suggest that these indices should be tested with a wide variety of ecological time-series data in order to evaluate the feasibility of inferring ecological stress from static data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01314814
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  • 2
    Electronic Resource
    Electronic Resource
    Growth, reproduction and mortality of the sea hare Dolabella auricularia (Gastropoda: Aplysiidae) in the Central Visayas, Philippines (1984)
    Springer
    Marine biology 79 (1984), S. 289-293 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The growth parameters W∞ and K of the von Bertalanffy growth equation were estimated from size-frequency data of the sea hare Dolabella auricularia using an objective, computer-based method. The results obtained from two locations in the central Philippines were comparable, although based on only a few individuals; the means for both sites were W∞=493 g and K=0.9 (yearly basis). A value of Z=3.66, corresponding to an annual survival rate of 2.6%, was estimated for the juveniles and adults from a length-converted catch curve. Spawning and recruitment were found to occur throughout the year with peaks in May to July and September to October.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00393260
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  • 3
    Electronic Resource
    Electronic Resource
    Fishbase as a tool for comparing the life history patterns of flatfish
    Amsterdam : Elsevier
    Netherlands Journal of Sea Research 32 (1994), S. 235-239 
    Details
    ISSN: 0077-7579
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0077-7579(94)90001-9
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  • 4
    Electronic Resource
    Electronic Resource
    A framework for latitudinal comparisons of flatfish recruitment
    Amsterdam : Elsevier
    Netherlands Journal of Sea Research 32 (1994), S. 107-118 
    Details
    ISSN: 0077-7579
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0077-7579(94)90035-3
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  • 5
    Electronic Resource
    Electronic Resource
    Hook Selectivity of Yellowfin tuna (Thunnus albacares) caught off Darigayos Cove, La Union, Philippines (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of applied ichthyology 5 (1989), S. 0 
    Details
    ISSN: 1439-0426
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Hook selection curve for yellowfin tuna Thunnus albacares caught off Darigayos Cove, Northern Luzon, Philippines were estimated using the Baranov/Holt method. Estimated optimum capture length (Lopt) increased with hook size, as did the selection range. Overall selection was found to be very asymmetrical, with small yellowfins n cm below Lopt having a much lower probability of capture than larger yellowfin n cm above Lopt.〈section xml:id="abs1-2"〉〈title type="main"〉Zusammenfassung Hakenselektivität bei Fang von Gelbßossenthunen (Thunnus albacares) vor Darigayos Cove, im Norden von Luzon, PhilippinenSelektionskurven wurden mittels der BaranovHolt-Methode für Haken bestimmt, die bei der Fischerei des Gelbflossenthuns Thunnus albacares bei Darigayos Cove, im Norden von Luzon, Philippinen, Verwendung finden. Die geschätzte optimale Fanglänge (Lopt) und die Selektionsspanne nehmen mit der Größe der Haken zu. Die Selektionskurven sind asymmetrisch, und Gelbflossenthune, die n cm kleiner sind als Lopt, werden mit einer viel geringeren Wahrscheinlichkeit gefangen als Gelbflossenthune, die n cm größer sind als Lopt.〈section xml:id="abs1-3"〉〈title type="main"〉RésuméSélectivité d'hameçons dans la pêche d'albacore (Thunnus albacares) au large de Darigayos, Luzon du Nord, PhilippinesLes courbes de sélectivité des hameçons utilisés pour la pêche d'albacore Thunnus albacares au large de Darigayos Cove, Luzon du Nord, Philippines, ont été estimées, sà l'aide de la méthode de Baranov/Holt. La longueur optimale de prise (Lopt) et l'écart de sélectivité augmentent avec la taille de l'hameçon. Les courbes de sélectivité sont très asymétriques et les petits albacores n cm en deçsà de Lopt ont une probabilité de prise beaucoup plus faible que les gros albacores n cm au delsà de Lopt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0426.1989.tb00564.x
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  • 6
    Electronic Resource
    Electronic Resource
    The population dynamics of Nemipterus marginatus (Cuvier & Val.) off Western Kalimantan, South China Sea (1980)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 17 (1980), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The following parameter values are derived for a West Kalimantan (West Borneo) stock of the threadfin bream, Nemipterus marginatus: L ∞= 24·5 cm(L.T.), W∞= 210g, K = 0·42, t= -0·41 andM= 1·73.Yield-per-recruit curves for N. marginatus are presented. Catch per hour of N. marginatus is very low, even in the area of highest density (=3·5 kg/h at 45 m depth). Single-species exploitation of a stock of the type represented by N. marginatus appears unfeasible and the conclusion is reached that the traditional single-species approach in fish population dynamics—such as exemplified in this paper—does not help in formulating rational exploitation schemes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1980.tb02760.x
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  • 7
    Electronic Resource
    Electronic Resource
    Simulation of the effects of oxygen on food consumption and growth of Nile tilapia, Oreochromis niloticus (L.) (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Aquaculture research 26 (1995), S. 0 
    Details
    ISSN: 1365-2109
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Fish need oxygen for aerobic generation of energy for body maintenance, locomotion, feeding and biosynthesis. The rate of oxygen uptake of most fish is limited by diffusion through the gills, and gill surface area grows at a slower rate than body mass. We hypothesize, therefore: (1) that the maximum rate of feed intake is related to the capacity to take in oxygen for processing of this feed; and (2) that the maximum rate of feed intake relative to body size decreases with increasing body size to a point where growth is zero. An oxygen limitation module based on this theory was incorporated into an existing dynamic simulation model for the Nile tilapia, Oreochromis niloticus (L.).The module calculates the maximum potential oxygen supply to the fish on the basis of Fick's law of diffusion and the allometric relationship between body weight and gill surface area. Total oxygen demand of the fish is computed as the sum of routine metabolism, feeding metabolism and energy needed for biosynthesis. In the module, the feeding rate is limited to a level where total oxygen demand does not exceed the potential supply.The model is used to simulate feeding and growth of O. niloticus. Simulation results provide strong support for the oxygen limitation theory. Hence, the model can be used for the analysis of fish growth as affected by feed amount, feed composition, as well as environmental conditions (temperature, dissolved oxygen concentration). It also explains differences in final size between fish species, and within species under different conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2109.1995.tb00932.x
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  • 8
    Electronic Resource
    Electronic Resource
    The biology, fishery and potential for aquaculture of Tilapia melanotheron in a small West African lagoon
    Amsterdam : Elsevier
    Aquaculture 7 (1976), S. 33-49 
    Details
    ISSN: 0044-8486
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0044-8486(76)90030-2
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  • 9
    Electronic Resource
    Electronic Resource
    Detritus and energy consumption and conversion efficiency of Sarotherodon melanotheron (Cichlidae) in a West African lagoon (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of applied ichthyology 4 (1988), S. 0 
    Details
    ISSN: 1439-0426
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: The growth, standing stocks and production of tilapia Sarotherodon melanotheron (Cichlidae) in the 1 km2 Sakumo Lagoon near Tema, Ghana, are estimated by application of recently developed models to previously published data. The new estimates are used to obtain values of food (i.e. sediment) consumption, some related statistics, and to assess bioturbation as caused by S. melanotheron.〈section xml:id="abs1-2"〉〈title type="main"〉ZusammenfassungDetritus, Energieverbrauch und Konversionseffizienz von Sarotherodon melanotheron (Cichlidae) in einer westafrikanischen LaguneDas Wachstum, die Biomasse und die Produktion von Tilapia Sarotherodon melanotheron (Cichlidae) in der 1 km2 Sakumo Lagune bei Tema, Ghana, wurden bestimmt auf der Basis von neueren Modellen und bereits veröffentlichten Daten. Die neuen Modellparameter werden benutzt, um die Nahrungs-, d. h. Sedimentkonsumption und verwandte Größen zu bestimmen, und um die Bioturbation zu schätzen, die S. melanotheron verursacht.〈section xml:id="abs1-3"〉〈title type="main"〉RésuméDétritus, dépense d'énergie et efficience de la conversion de Sarotherodon melanotheron (cichlidés) dans une lagune en Afrique de l'ouestLa croissance, la biomasse et la production du tilapia Sarotherodon melanotheron (Cichlidés) ont été estimées pour le stock de la lagune de Sakumo (1 km2), près de Tema, Ghana, en utilisant des modèles recents et des données déjà publiées. Les nouvelles valeurs sont utilisées pour l'estimation de la consommation en nour re (= sediment) ainsi que quelques autres charactéristiques de S. melanotheron, et pour estimer le taux de bioturbation qui résulte de ses activités.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0426.1988.tb00561.x
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  • 10
    Electronic Resource
    Electronic Resource
    Food consumption by tropical and temperate fish populations: some generalizations (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 35 (1989), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Published estimates of ration and/or food conversion efficiency of various size groups of fishes from 75 different stocks belonging to 56 tropical and temperate species were standardized and re-expressed as annual fish food consumption (Q) per unit biomass of the age-structured population (B). Although derived from extremely heterogeneous sources, these estimates of Q/B show surprisingly regular patterns. These allow confirmation of some earlier hypotheses, e.g. that Q/B increases with water temperature and decreases with asymptotic weight. More interestingly, it is shown that the aspect ratio of the caudal fin of fishes that use the carangiform and related swimming modes (i.e. subcarangiform and thunniform) correlates closely with Q/B, when other factors are accounted for. A brief discussion of some implications of these and related results is provided.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1989.tb03041.x
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