This work proposes the manufacture of bioplastics for food packaging using starch, carboxymethylcellulose, and green coconut waste (Cocos nucifera), with addition acid-base mediators to indicate pH food. The method was based on experimental research, in which films were produced casting technique incorporated at a concentration 1% (v/v). results showed high percentage solubility, an average 95.09%, low moisture content dry basis, 0.95%, presented visually noticeable colorimetric changes...

Sex control in fish is a promising technique for aquaculture, since it gives advantages associated with one sex. The aim of this study was to investigate the feminization common snook (Centropomus undecimalis) by oral administration two doses estradiol-17β (50 and 100 mg E2 kg-1 feed) treatment 45 days evaluate their effects on sex ratio, growth survival juveniles. After period, were fed only commercial feed without hormone supplementation. During period administration, grew more than those...

The Brazilian sardine is the most important fishery resource in Brazil. Their production has declined along last 30 years due overfishing, climatic and oceanographic phenomena. This study was carried out to determine optimal feeding frequency for juvenile based on growth, feed efficiency, intake body composition. Six frequencies of one, two, three, four, five six times a day were evaluated triplicate tanks 50 days. Fish with initial mean weight 3.29 ± 0.56 g fed daily apparent satiation....

The objective of the present work was to determine optimum dietary protein level for juvenile mullets. Five isocaloric diets were formulated contain increasing levels (300, 350, 400, 450 and 500 g kg−1) crude (CP) corresponding 18.7 MJ metabolizable energy kg−1. All tested in triplicate. Each experimental unit composed a 50 L tank with juveniles (mean ± SE initial weight length equal 1.17 0.02 4.34 0.03 cm respectively). Diets offered five times day until apparent satiation 35 days. No...

A 6-week growth trial was conducted to evaluate the effects of feeding rate on performance, body composition, plasma metabolites and enzyme activities, determine optimal for juvenile Brazilian sardine. Fish were fed at six rates, 2, 4, 6, 8, 10% BWday−1 (body weight per day) until satiation (10.3% BWday−1). The survival fish 2%–6%BWday−1 significantly higher (p < .05) than other rates. final specific increased with increasing rates while feed utilization decreased. Total proteins,...

The common snook, Centropomus undecimalis, is an emerging species for intensive fish culture, however, some reproductive aspects of this species, especially the development testes and action androgen hormones on spermatogenesis have not been studied. objective study was to evaluate effects 17α-methyltestosterone (MT) steroidogenesis during first sexual maturation snook. fish, which were reproduced in captivity, had a body weight 305.80 ± 35.60 g total length 34,11 1,08 cm. We used...

The aim of the study was to evaluate influence changes in seawater salinity on juvenile Brazilian sardine (Sardinella brasiliensis). Through two assays, LC50 (96 h) and zootechnical performance (42 days) were determined, respectively. In first assay, six treatments 0, 7, 14, 21, 28 35 parts per thousand (ppt) with three replicates established. For this, 100-L cylinder-conical tanks used, 30 individuals 45-day after eclosion (DAE) unit, without water renewal feeding. groups 0 7 ppt, all fish...

The common snook (Centropomus undecimalis) is a protandric hermaphrodite fish that has potential for aquaculture due to its high value and market acceptance. One of the difficulties reproduction in captivity females are older bigger than males. objective this study was use 17-β oestradiol (E2) hormone implants induce sex inversion adult Fish with an initial body weight 383 ± 83 g (mean SD), individually tagged were used experiment. Four E2 dosages (n = 7) tested (0.5, 1.0, 4.0 8.0 mg kg−1)...

The limited availability of live bait for capturing skipjack tuna, Katsuwonus pelamis, is a bottleneck to increasing tuna production in many parts the world. Therefore, nutrition trial was performed contribute Brazilian sardine, Sardinella brasiliensis, use as bait. This study determined best dietary carbohydrate lipid ratio (CHO:L) juvenile sardines based on growth performance, feed utilisation, body composition, blood metabolites and digestive enzyme activity. Six isoenergetic...

A six-week growth trial was performed to estimate the dietary protein requirements for maximum of juvenile Brazilian sardine (Sardinella brasiliensis) based on performance, feed utilization, body composition and digestive enzyme activity. Six isoenergetic diets were formulated contain levels that increased from 250 500 g/kg. Each diet randomly assigned triplicate groups 160 fish with mean initial weight 0.93 ± 0.13 g, which fed four times a day apparent satiation. Growth tended increase in...

From early development until the completion of metamorphosis, fat snook (Centropomus parallelus) larvae are commonly fed rotifers Brachionus spp.and Artemia spp.nauplii.In this study, cultivated copepods Acartia tonsa were evaluated as feed for 15-to 45-day-old larvae.Two experiments performed using twelve 30-L tanks stocked with 3.3 L -1 .Their initial mean weight and length 1.35 ± 0.01 mg (mean standard deviation) 3.83 0.33 mm 15-day-old 2.79 1.2 6.99 0.88 31-day-old larvae.Three dietary...

O desmame, ou seja, a substituição do alimento vivo por inerte é uma etapa crítica para produção de alevinos peixes marinhos. Este trabalho teve objetivo avaliar o efeito período co-alimentação (alimento e inerte) sobre sobrevivência, crescimento os custos juvenis linguado Paralichthys orbignyanus. Durante co-alimentação, (idade inicial 32 dias) receberam Artemia enriquecida juntamente com ração. Foram testados três períodos co-alimentação: 15, 20 25 dias, mais um grupo controle alimentado...

This research represents the first result of studies common snook Centropomus undecimalis larvae from broodstock matured in captivity Brazil. The aim this study was to evaluate if inclusion Acartia tonsa nauplii improves stress resistance larvae. were fed with: rotifers Brachionus plicatilis (10 15 mL-1); A. (0.25 0.5 mL-1) and (5 7.5 mL-1), (0.12 0.25 mL-1). average percentage survival treatments 11.9%. At 20 days age, subjected thermal stress. Subsequently, evaluated. Common B....

The objective of this experiment was to compare survival and growth fat snook(Centropomusparallelus) common snook (Centropomusundecimalis), reared in freshwater under different stocking densities. lasted 251 days. fish were randomly distributed cages (1 m x 1 0.8 m), treatments triplicate, placed inside an earthen pond located Camboriu (SC). Water quality parameters measured adequate for the species, except low temperatures (19.8 ± 3.3 °C). Zootechnical analyzed by a two-way ANOVA (species...

A carapeva Eugerres brasilianus é um peixe onívoro que apresenta ampla distribuição na costa brasileira e possui potencial para piscicultura marinha estuarina. O objetivo deste trabalho foi avaliar o desempenho de juvenis em diferentes temperaturas. Os utilizados apresentavam peso comprimento total inicial 0,73 ± 0,14 g 3,96 0,21 cm, respectivamente. Foram testadas 3 temperaturas (22, 26 30˚C) com 4 repetições cada, durante 45 dias. As unidades experimentais eram tanques 100 L, 50 peixes por...

This study aimed to evaluate the addition of sodium acetate and citrate in diets fingerling fat snook (Centropomusparallelus), through growth performance modification intestinal microbiota. In experiment, 3,000 fingerlings were used, with an initial average weight 0.57 ± 0.10 g. The fish stocked into 12 tanks (50 L) at a density 5 L-1 per tank distributed three treatments four replicates. as follows: control group (without supplementation), one supplemented acetate, another citrate. organic...

This study aimed to evaluate the addition of sodium acetate and citrate in diets fingerling fat snook (Centropomus parallelus), through growth performance modification intestinal microbiota. In experiment, 3,000 fingerlings were used, with an initial average weight 0.57 ± 0.10 g. The fish stocked into 12 tanks (50 L) at a density 5 L-1 per tank distributed three treatments four replicates. as follows: control group (without supplementation), one supplemented acetate, another citrate....