The influence of feeding frequency was evaluated on weight gain, specific growth rate, feed conversion and survival of jundiá juveniles. Twelve groups of 280 fish (7.47 ± 1.73 g) were each stocked in twelve ponds (2 fish/m2) and fed to apparent satiety an extruded commercial feed containing 42% CP In four feeding schedules: 1, 2, 3 and 4 times a day, in triplicate, for 120 days (May to September, 2003). Average weight gain was recorded by sampling 10% of the […]

Skeletal muscle consists predominantly of muscle fibers surrounded by a connective tissue layer. This tissue has a great plasticity, and the knowledge of the morphological characteristics, myogenesis, and growth dynamics is important to the understanding of its physiology and to the farm animal selection for meat production. Most skeletal muscles are derived from mesodermal precursor cells originated from the somites. During embryonic development, specification of mesodermal precursor cells to the myogenic lineage is regulated by positive and negative signals from […]

A mechanistic simulation model of fish larval growth should contribute to a better understanding of growth and metabolism of fish larvae. It should also assist in studying the nutritional requirements and developing feeding strategies. A model was developed that simulates growth and biochemical composition in time. The model is driven by feed intake, with absorbed nutrients being used for energy production and biosynthesis, based on the stoicheometry of intermediary metabolism. Model simulations suggest that imbalanced dietary amino acid (AA) profiles […]

“The most important collateral effect of knowledge is ignorance. Just imagine someone else living in the knowledge island circulated by a sea of ignorance. When the surface of the island grows through the progress of science, also grows its border, its perimeter length, the frontier with the unknown”. (David Gross, 2004 Nobel laureate) The use of stable isotopes of bioelements (CHONS) are present in atmosphere, hydrosphere, lithosphere and biosphere, emerging as high potential tools for researches within different areas of […]

The objective of this article is to introduce the reader to a reflection about the strategies of interconnection of the aquaculture in the human-environmental context, shouting the committed actors with the sector it research and utilize approaches of feasibility in conformity with the beginning of the sustainability. Sustainability is a complex idea and an abstract concept that provides a framework for interdisciplinary dialogue, interaction and research. The Principle of Sustainable Development as it was endorsed in the Rio-Declaration of 1992, […]

Semen samples of five specimens of Prochilodus lineatus (Valencienes, 1847) were used to test the toxic and cryoprotectants effects of six solutions based on BTS (Beltsville Thawing Solution®) 4.5%: A – BTS 4.5% + Methanol 10%; B – BTS 4.5% + DMSO 10%; C – BTS 4.5% + KCl 0.072% + Methanol 10%; D – BTS 4.5% + KCl 0.072% + DMSO 10%; E – BTS 4.5% + KI 0.036% + Methanol 10% and F – BTS 4.5% + KI […]

This study was carried out to evaluate the performance of Nile tilapia, cultured in net pens, and fed diets containing 27.0 (control), 25.2, 24.3, and 22.7% of digestible protein. Crystalline amino acids (L-lysine, DL-methionine and L-threonine) were added to keep amino acid levels according to the ideal protein profile and to simulate amino acid levels of the control diet. Fish (34.63±1.19 g) were hand-fed one of the four isoenergetic (3,075 kcal of digestible energy/kg, as fed basis) experimental diets until […]

The present experiment was carried out to determine the different stages during ontogenesis of greater sensitivity to hormonal treatments of sex reversal of Nile tilapia larvae (Oreochromis niloticus) with 17 a-metiltestosterone (MT) by bath immersion in 2.0 mg of MT.L-1 for 36-h period. In the hormonal treatment, 3,000 Nile tilapia were allotted to 15 2 L- plastic containers (experimental units) as a complete randomized design, with five treatments and three replicates. The treatments consisted of the fish immersion at different […]

The nutrient apparent digestibility of diet with increasing phytase levels based on vegetable ingredients fed to 90 Nile Tilapia juveniles averaging 120.0 g and allotted to none tanks (ten fishes/tank) was determined. The experiment was analyzed as a complete randomized design with nine treatments and six replicates. The treatments consisted of: control (with phosphorus supplementation) and eight treatments without phosphorus supplementation (with 500, 1,000, 1,500, 2,000, 2,500, 3,000, 3,500, and 4,000 units of phytase [UF]/kg of diet). All diets were […]

An assay was conducted to evaluate the development of Iguaçu surubim (Steindachneridion melanodermatum) larvae fed different diets. The experiment was analyzed as a complete randomized design with five treatments and four replicates, in 35 L-aquaria, each one with 15 larvae (8.35±0.85 mm and 6.75±0.64 mg). The treatments consisted of five feeding programs: Artemia (A); diet (D); zooplankton (Z); Artemia with diet (A+D); and zooplankton with diet (Z+D). Larvae development was evaluated in illuminated environment during 29 days. For larvae feeding […]