ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Blackwell Publishing Ltd  (6)
  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 61 (2002), S. 0 
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The species composition and dynamics of fish larvae in three mangrove creeks located in the Caeté Estuary (north Brazil) were studied monthly using a trap net during diurnal ebb tides. A total of 109 954 larvae, representing 25 families and 54 species, were collected from October 1996 to October 1997. The community was dominated numerically by a few species, a feature common for other estuarine fish populations. The most abundant taxa were estuarine species, namely the eleotrid Guavina guavina (46·7%) and the engraulid Anchovia clupeoides (14·9%). The sciaenid Cynoscion acoupa was the only marine species that used the mangroves extensively as a nursery site, occurring mainly at the postflexion stage. The size distribution of G. guavina did not produce shifting modes, indicating continuous transport out of the mangroves by tidal currents. Significantly lower species richness was observed in the late rainy season, primarily due to the emigration of marine species. Intermediate seasons were characterized by more complex larval fish assemblages. The temporal trends of the dominant species was influenced to a great degree by their life history strategy.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 2
    ISSN: 1365-2109
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract. Feeding trials with juvenile Colossoma macropomum Cuvier (approximately 40g) were carried out to study their protein requirements and their efficiency in metabolizing vegetable protein. Two groups of diets were used. In one group, the crude protein consisted exclusively of fish protein concentrate. In the second group the protein consisted of a mixture (55:45) of vegetable and animal protein without fish meal. In each group 30 and 50% protein levels were used. The highest weight increase (1·64%/day) and the lowest feeding rate were obtained with the 50% protein fish meal free diet. During the trial all fish accumulated visceral fat while body protein content decreased and dry matter increased. There was a high correlation between liver weight and liver glycogen. The highest amounts of liver glycogen were induced by diets containing fish meal and/or low protein content. In contrast lo visceral fat deposits, accumulated liver glycogen was of less significance for surviving starvation periods. The activity of digestive enzymes depends on both stomach and gut fullness. Trypsin activity, contrary to pepsin, was correlated with diet protein content, a-amylase activity was not correlated with diet composition.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of applied ichthyology 10 (1994), S. 0 
    ISSN: 1439-0426
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: With the annual floods fish are able to move into the inundated forests and procure fruits and seeds. Feedin trials with young Colossoma macropomum (Characidae) weighing 18 g were carried out to study keir efficiency to metabolize abundant fruits and seeds (Pseudobombax munuba, Oryza sp., Hevea spp., and Cecropia latiloba) from inundated forests. Crude rotein content of the fruits varied between 4.1 and 21.3%. Growth rates of fish were comared wit! those fed a control diet of 35% crude protein. The highest weight increases (2.5% per day) were obtained with the control diet. Within the fruit and seed treatment growth rates were correlated with the protein content of the food source; however, rotein efficiency ratio decreased. Best specific growth rate of 1.3% per day was obtained when feeding, P. munguba seeds (21.3% crude protein). With the treatments with P. munguba and Oryza sp. crude fat content of the fish body increased while the protein content decreased. As foodplain forests are of importance by nourishing many commercial fish species, negative consequences of floodplain deforestation for lsh communities are discussed.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of applied ichthyology 8 (1992), S. 0 
    ISSN: 1439-0426
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: With a total production of 223,626 tonnes and 1.5 % of the world roduction in 1988, the importance of aquaculture in Latin America is minor. Only when intended for exon has production increased, especially evident in salmonid production in Chile and shrimp proluction in Ecuador. Interest in culturing endemic fish species has increased significantly; however, production has seldom progressed beyond the pilot stage and is still of no economic importance. Information on mollusc culture potential indicates excellent conditions along the Pacific coast, but this depends upon marketing methods and seeking new markets. The exploitation of marine alae is an important factor in the economies of several Latin American countries. Therefore it is very fesirable to continue cultivation attempts of some species; better exploitation through coordinated planning would certainly help aquaculture in Latin America economically.〈section xml:id="abs1-2"〉〈title type="main"〉ZusammenfassungDer Status der Aquakultur in Latein-AmerikaDie Bedeutung der Aquakultur in Latein-Amerika ist mit 223.626 t im Jahre 1988 im Vergleich zur Weltproduktion recht gering (1,5 %). Eine Produktionszunahme erfolgte nur im Zusamrnenhang mit der Erzeuung von Exportprodukten. Dies ist besonders deutlich bei der Salmonidenzucht in Chile und der Krebsfultur in Ecuador. Immerhin hat das Interesse, die einheimischen Arten zu züchten erheblich zuymmen, jedoch ist die Produktion nur selten über die Pilotphase hinweggekommen. Verfügbare Inormationen über das Potential der Molluskenkultur zeigen ausgezeichnete Bedingungen entlang der Pazifikküste an. Allerdings hängt die Enswicklung von der Erschließung neuer Märkte und Marketing-Methoden ab. Die Nutzung mariner Algen ist ein wichtiger ökonomischer Faktor in einigen Ländern Südamerikas. Es ist daher wünschenswert, die Versuche zur Kultivierung einiger Arten fortzusetzen. Eine bessere Ausnutzung aller verfügbarer Ressourcen durch bessere Koordinierungs- und Planungs-konzete würde sicherlich helfen der Aquakultur in Latein-Amerika den Stellenwen zu geben, den sie wirtscfaftlich verdient.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 5
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 32 (1988), S. 0 
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Serrasalmids of the genus Mylossoma are obligate gill-breathers that are encountered in the floodplain lakes of Amazonia, even when the oxygen concentrations there are below 0.5 mg l−1. It was shown by experiments that fish of these species are capable of utilizing the oxygen-rich surface layer of the water for respiration, in order to survive periods of habitat-induced hypoxia. This so-called aquatic surface respiration entails an increase in locomotory activity and an ecomorphosis involving the formation of a dermal extension on the lower jaw, that apparently has a hydrodynamic function for using the surface layer for gill respiration; when the water is aerated, it retrogresses to its original size. Histological examination showed that the extension is formed by edematous processes in the stratum spongiosum.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 6
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 53 (1998), S. 0 
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Annulus formation on the scales of the Central Amazonian anastomid fish Schizodon fasciatus was studied with respect to periodic variations in growth rates caused by seasonal inundation or associated biological processes. Monthly samples from fish markets were analysed with regard to marginal scale increment, feeding index, condition factor, gonadosomatic index, and body cavity fat content. There was a significant variation in all indices which was related to seasonal change in water level. Fat storage was related to energy requirements especially during gonad maturation. Fastest growth was observed during the period of falling water level. The formation of scale growth marks corresponded to the period of gonad maturation between January and February. The results indicate the formation of only one single growth mark on scales per year.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...