Rafael Ernesto Balen

BROWN SEAWEED MEAL TO NILE TILAPIA FINGERLINGS

EnglishThis work evaluated the effects of increasing levels of the brown seaweed Ascophyllum nodosum meal (BSM) in the feed given to Nile tilapia Oreochromis niloticus fingerlings. The completely randomized design experiment lasted 42 days. Nile tilapia fingerlings (n=75) with an average age of 30 days and average weight of 0.43 ± 0.02 g were assigned to 25 plastic tanks and submitted to five treatments in five repetitions. The treatments were increasing levels of BSM (5, 10, 15, and 20 g kg -1 of feed) and a control feed (no BSM). Each experimental unit was made up of a 36 L plastic tank with three fingerlings. The parameters studied were final average weight, percentage of weight gain, apparent feed conversion ratio, total length and carcass yield with and without head. The final average weight, percentage of weight gain, and total length were not affected by the treatments (p>0.05). The apparent feed conversion ratio improved linearly (p portuguesEste trabalho avaliou os efeitos de niveis crescentes da farinha de alga marrom Ascophyllum nodosum (FAM) nas racoes para alevinos de tilapia do Nilo Oreochromis niloticus. O experi- mento, com delineamento inteiramente casua- lizado, durou 42 dias. Foram utilizados alevinos de tilapia do Nilo (n= 75) com idade media de 30 dias e peso medio de 0,43 ± 0,02 g, distribuidos em 25 tanques plasticos submetidos a cinco tratamentos e cinco repeticoes. Os tratamentos foram niveis crescentes de farinha de alga marrom (5, 10, 15 e 20 g kg -1 de racao) e uma racao controle (sem FAM). Cada unidade experimental foi composta por um tanque plastico de 36 L com tres alevinos. Foram estudados os parâmetros medios de peso final, percentagem de ganho de peso, taxa de conversao alimentar aparente, comprimento total e rendimento de carcaca, com e sem cabeca. As medias de peso final, percentagem de ganho de peso e comprimento total nao foram influenciadas pelos tratamentos (p>0,05). Os valores da taxa de conversao alimentar aparente melhoraram linearmente (p

Exigência de proteína bruta para juvenis de pacamã

Pacama (Lophiosilurus alexandri) is a species of carnivorous fish, suitable for farming, but little studied. The aim of this study was to determinate crude protein (CP) requirement to pacama, L. alexandri, in juvenile phase, an experiment was conducted during 45 days in a completely randomized design, with five treatments (36.2, 38.2, 42.0, 44.4, and 48.8% CP of diet) and four replications, where a hundred juvenile fishes (5.19 ± 0.01 g) were distributed in twenty 36 L aquaria. Each aquarium with five juveniles was considered an experimental unit. The parameters evaluated were final weight, percentage weight gain, specific growth rate, survival rate, hepatosomatic index, carcass yield with and without head, total length, head length, width, and height. By the regression analysis was verify a (P 0.05). Thus, it is recommended to use feed containing 36.2% of crude protein to pacama (L. alexandri) juveniles.