Sample records for prawns
from WorldWideScience.org

Sample records 1 - 3 shown.



1

Efeito da densidade populacional sobre as curvas de crescimento de Macrobrachium rosenbergii (De Man) em cultivo semi-intensivo (Crustacea, Palaemonidae)/ The effect of stocking density on Macrobrachium rosenbergii (De Man) growth curves in earthen ponds (Crustacea, Palaemonidae)

Valenti, Wagner Cotroni; Mello, Jeanette de Toledo Cardoso de; Castagnolli, Newton
1993-01-01

Resumo em inglês In this article the length growth curves of Macrobrachium rosenbergii (De Man, 1879) held in different population densities were analysed. Postlarvae prawns were stocked into five 0,02 ha earthen ponds at densities of 4, 8, 12, 16 and 20 ind./m² during six months. Forthnightly, the mean total length of animals from each pond were obtained by means of random samples. For each population the length growth curves and the instantaneous growth rate expressions were determined (mais) . The growth rate and the asymptotic maximum length decreased with the stocking density raised. This effect is greater when the density ranges in low levels. The growth decrease can be due to intraspecific competition for life resources and to negative interactions between individuals, as aggressive or social behavior, that increase with the increase prawns density.

Scientific Electronic Library Online (Portuguese)

2

Composição centesimal e perfil de ácidos graxos do camarão-d'água-doce/ Centesimal composition and fatty acids profile of freshwater prawn

Furuya, Wilson Massamitu; Hayashi, Carmino; Silva, Adriano Borges Martins da; Santos Júnior, Oscar de Oliveira; Souza, Nilson Evelázio de; Matsushita, Makoto; Visentainer, Jesuí Vergílio
2006-08-01

Resumo em português Este estudo foi realizado para determinação da composição centesimal e do perfil de ácidos graxos do camarão-d'água-doce Macrobrachium amazonicum visando à análise de seu potencial nutritivo. Seis lotes (100 g cada um) de camarões inteiros e com massas individuais de 0,9 a 1,2 g foram triturados, armazenados e, posteriormente, analisados quanto aos teores de umidade, cinzas, PB e lipídios totais (70,3; 1,5; 24,8 e 1,5%, respectivamente). Foram detectadas 36 var (mais) iedades de ácidos graxos, sendo o mais freqüente o ácido palmítico-16:0 (18,2%). Entre os da série ômega-3, os mais encontrados foram o eicosapentaenóico-20:5n-3, di-homo-alfa-linolênico-20:3n-3, docosahexaenóico-22:6n-3 e alfa-linolênico-18:3n-3 (frequências de 13,9; 9,5; 6,8 e 4,2%, respectivamente). As freqüências de somatórias de ácidos graxos foram de 36,9% para os ômega-3 e de 46,8% para os poliinsaturados. As razões entre os ácidos graxos ômega-6/ômega-3 (n-6/n-3) e os ácidos graxos poliinsaturados/ácidos graxos saturados (AGPI/AGS) foram de 0,3 e 1,6, respectivamente. Todos os parâmetros observados indicaram bom potencial nutritivo para a carne do camarão-d'água-doce. Resumo em inglês The aim of this work was to determine the centesimal composition and fatty acids profile of freshwater prawn (Macrobrachium amazonicum) for determination of its nutrient potential. Six lots (each one with 100 g) containing whole prawns with individual mass ranging from 0.9 to 1.2 g were triturated and stored for posterior chemical analysis. The average values for moisture, ash, CP and total lipids were as follows: 70.3, 1.5, 24.8, and 1.5%, respectively. It was detected 3 (mais) 6 varieties of fatty acids, and the most abundant was the palmitic -16:0 acid with 18.2%. The major omega-3 fatty acids were: eicosapentaenoic-20:5n-3, dihomo-alpha-linolenic-20:3n-3, docosahexaenoic-22:6n-3 and alpha-linolenic-18:3n-3 with frequencies of 13.9, 9.5, 6.8, and 4.2%, respectively. The total frequencies of fatty acids were of 36.9% for omega-3 and 46.8% for polyunsaturated fatty acids. The omega-6/omega-3 (n-6/n-3) ratio and polyunsatured to satured (PUFA/SFA) ratio were of 0.3 and 1.6, respectively. All parameters indicated a good nutritional value of the M.amazonicum meat.

Scientific Electronic Library Online (Portuguese)

3

Biologia dos Palaemonidae (Crustacea, Decapoda) da bacia hidrográfica de Ratones, Florianópolis, Santa Catarina, Brasil/ Biology of Palaemonidae (Crustacea, Decapoda) from the Ratones hidrografic basin, Florianópolis, Santa Catarina, Brazil

Müller, Yara Maria Rauh; Nazari, Evelise Maria; Ammar, Dib; Cargnin Ferreira, Eduardo; Beltrame, Ingrid Thaís; Pacheco, Cristiane
1999-01-01

Resumo em inglês Biological aspects of palemonids, collected from March, 91 to December, 95 in the Ratones Hidrographic Basin, Florianópolis, Santa Catarina, have been investigated. Individuals of different sizes of Macrobrachium acanthurus (Weigmann, 1836), Macrobrachium carcinus (Linnaeus, 1758), Macrobrachium olfersii (Weigmann, 1836), Macrobrachium potiuna (Müller, 1880), Palaemonetes argentinus Nobili, 1901 and Palaemon pandaliformis (Stimpson, 1871) were registered. These prawns, (mais) showed reproductive strategies, typical of the Palaemonidae (Rafinesque, 1815), associated to species particularities, and seem to adapt to different environmental conditions.

Scientific Electronic Library Online (Portuguese)