Haematological characteristics of freshwater-reared and wild mullet, Mugil platanus Günther (Osteichthyes, Mugilidae)

Mullets, Mugilplalanus Günther, 1880. were obtained from the estua-rine area of CananÉia (São Paulo, Brazil) and from freshwater tearing tanks. For each fish the body weight, body length, gonad weight and gonad maturation stage were recorded and the allometric index (K) was calculated. Blood was collected for hematocrit (Ht), hemoglobin level (lib), total cell count (Er), and the determination of hematological indices (MCV. MCH, MCHC), as well as the differential leukocyte count (lymphocytes, monocytes, neutrophils, basophils and '"other cells"). The averages of the hematological analyses, hematological indeces, condition factor and leukocytes percentage of the specimens acclimated to fresh water were significantly higher than those of the specimens from the estuary

Caracterização de genótipos e estimativa de parâmetros genéticos de características produtivas de sorgo forrageiro Characterization of genotypes and estimates of genetic parameters of productive traits for forage sorghum

Avaliou-se o desempenho produtivo de 29 genótipos de sorgo forrageiro por meio dos dados de matéria verde, matéria seca, altura da planta, floração inicial e sobrevivência da planta. Além do desempenho, foram estimadas a herdabilidade de cada característica e as correlações genotípicas e fenotípicas entre elas, as quais são úteis nos programas de melhoramento genético empregando-se seleções direta e indireta. Utilizou-se o delineamento em blocos completos ao acaso com três repetições, em análise de variância univariada. Houve variabilidade genética para todas as características, com diferenças significativas entre as médias dos genótipos. A herdabilidade foi elevada, sobretudo para altura da planta. As correlações genotípica e fenotípica da matéria verde com a matéria seca (0,83 e 0,76, respectivamente) e da matéria seca com a altura da planta (0,87 e 0,72) foram expressivas. As correlações foram medianas entre matéria verde e altura da planta (0,61 e 0,52) e entre matéria verde com a sobrevivência (0,71 e 0,61). A floração inicial foi a característica menos correlacionada às demais. A altura da planta, por ser medida antes do corte e ter apresentado herdabilidade muito alta, além de correlação genotípica moderada com a matéria verde e alta com a matéria seca, ambas medidas após o corte, pode ser utilizada para obtenção de ganho genético nessas características via seleção indireta.<br>Productive performance of 29 genotypes of forage sorghum was evaluated by data of fresh matter, dry matter, plant height, initial flowering and plant survival. Heritability was also estimated for each trait, as well as the genotypic and phenotypic correlations among them. Such parameters are useful in genetic breeding programs by using direct and indirect selection. Randomized complete block design with three replications was used, in univariate analysis of variance. Genetic variability for all traits was observed and the genotype means were significantly different. Heritability presented high values, mainly for plant height. Genotypic and phenotypic correlations between fresh matter and dry matter (0.83 and 0.76, respectively) and dry matter with plant height (0.87 and 0.72) produced high values. Correlations were moderate among fresh matter and plant height (0.61 and 0.52) and among fresh matter with survival (0.71 and 0.61). Initial flowering was the trait less strongly correlated with the others. Because plant height was recorded before cutting and for showing high heritability and moderate genotypic correlation with fresh matter and a high one with dry matter, both of them observed after cutting, it appears to be feasible as to achieve genetic breeding for those traits through indirect selection

Haematological characteristics of Brazilian Teleosts: III. Parameters of the hybrid tambacu (Piaractus mesopotamicus Holmberg x Colossoma macropomum Cuvier) (Osteichthyes, Characidae)

Fifty six specimens of the hybrid "tambacu" (Piaractus mesopotamicus Holmberg, 1887 male x Colossoma macropomum Cuvier, 1818 female) were collected from fishfarm of Guariba, São Paulo, to evaluate their haematology. Fishes presented 400.0 to 3,100.0 g total weight and 20.0 to 52.0 cm total length. Haemoglobin, haematocrit, mean corpuscular haemoglobin content (MCHC) and percentage of defense blood cells including leucocytes and thrombocytes, were studied. Statistical analysis showed positive correlation (P<0.01) between haematocrit, MCHC and haemoglobin rate. Nevertheless, thrombocytes and lymphocytes showed negative correlation (P<0.01)