A5019456445- Fish Ecology and Management Studies
- Reproductive biology and impacts on aquatic species
- Fish Biology and Ecology Studies
- Aquaculture Nutrition and Growth
- Marine and fisheries research
- Genetic diversity and population structure
- Aquaculture disease management and microbiota
- Animal Genetics and Reproduction
- Genetic and Clinical Aspects of Sex Determination and Chromosomal Abnormalities
- Fish biology, ecology, and behavior
- Identification and Quantification in Food
- Sperm and Testicular Function
- Genetic and phenotypic traits in livestock
- melanin and skin pigmentation
- Genetic Mapping and Diversity in Plants and Animals
- Chromosomal and Genetic Variations
- Marine Ecology and Invasive Species
University of Chile
1990-2024
Dirección de Investigación y Desarrollo
2019
Agriaquaculture Nutritional Genomic Center
2017
Abstract Back, flank (reddish band along the lateral line and below line), belly regions of cultured rainbow trout Oncorhynchus mykiss were characterized in terms skin coloration, spottiness, darkness by using computer‐based image analysis as an approach to separate fish into desirable back color categories for market export. Three highly represented colors observed on (mean ± SE percentage area covered given color): blue or sky‐blue, 18.0 1.8%; yellow, 13.4 1.5%; green, 66.1 2.0%....
The rainbow trout is a salmonid fish that occasionally exhibits broodstocks with biannual spawning behavior, phenomenon known as double annual reproductive cycle (DARC). Spawning time quantitative trait loci (SPT-QTLs) affect the of year female spawn and may influence expression DARC trait. In this study, microsatellite markers linked unlinked to SPT-QTLs were genotyped investigate underlying genetics influenced since in two case-control comparisons three (OmyFGT12TUF, One3ASC One19ASC) had...
Abstract Reproductive variables of 986 female rainbow trout (Oncorhynchus mykiss) spawned during 1990 in a hatchery central Chile were evaluated. Data recorded on individual females. Fish over 9-month period, from March to November. The data indicated the coexistence different strains fish with spawning times. There was direct relationship between body weight and total fecundity (r = 0.71; P < 0.001, n 905). correlation egg diameter low 0.16; 0.001; N 890). relative not only low, but...
Data on reproductive traits in a cultured population of brown trout (Salmo trutta L.) southern Chile were collected over three consecutive seasons: 1999, 2000 and 2001, corresponding to the first (at 3 years), second third spawnings females. from individual females (n=238, 273 169 respectively). The season lasted mainly June August. peak (July) tended increase with each (55.46%, 62.27% 80.81% total spawning fish Female body weight (470.8±102.5, 735.0±150 1263.9±263.4 g), fecundity (1182±344,...
Determinaciones cariotipicas en adultos y embriones de Oncorhynchus mykiss. permitieron establecer diferencias el polimorfismo cromosómico una población piscicultura otra asilvestrada. Los números cromosómicos diploidcs oscilan entre 2n = 58 a 61 60 63 respectivamente, manteniéndose un NF= 104. La identificación cromosomas mediante mediciones cromosómicas. bandeo C AgAsNOR. permite correspondencia sexo gonadal (sistema XX/XY). aparear homólogos reconocimiento del patrón distribución la...
This study compares the gonadosomatic index (GSI), oocyte growth (OG), gonadal histology, and plasma level concentrations of sex hormones (estradiol-17 β (E2) vitellogenin (V)) twice-spawning (T-SP) once-spawning (O-SP) females rainbow trout throughout additional normal reproductive cycle, respectively. In T-SP, GSI values rapidly increase from May to November, in contrast O-SP, which showed low constant (1.19 14.5 1.19 0.63, resp.). T-SP exhibited a marked OG same period, reaching maximum...
Numerous self-sustaining naturalized or introduced populations of rainbow trout (Oncorhynchus mykiss) are widely distributed throughout the freshwaters southern Chile. In this study, analysis mitochondrial DNA control region (CR) marker was conducted to investigate level genetic divergence among and their phylogenetic relationships with respect native lineages. This information provided a framework interpret structure origin that shaped during historical introduction efforts. To end, we...
Abstract Data on reproductive traits from 1,229 mature 2-year-old female coho salmon Oncorhynchus kisutch were collected during 2 years at four farms in southern Chile. Spawning periods similar 1993 and 1994 (39 41 d, respectively). The spawning period of May–June, corresponded to the full northern hemisphere. mean weight females (about 4 kg) was almost double reported hemisphere for maturing females. pigmented eyed stage reached approximately 270 accumulated temperature units (ATU days × °C...
Abstract Naturalized brown trout populations in Chile are a valuable genetic resource with aquaculture potential. The oogenesis of three‐year‐old cultured population was studied southern Chile. Gonadosomatic index (GSI), oocyte growth, gonadal microscopic characteristics, and plasma levels estradiol–17β (E2), testosterone (T), 17α–hydroxyprogesterone (17α–HP) were measured bimonthly for nine‐month period before spawning. maximum GSI level (22%) similar to that described other salmonids,...
Reproductive variables from 1529 females and 168 males of Atlantic salmon Salmo salar L. 1758 were recorded individually during the 1995 spawning season at a farm in south Chile. The period occurred autumn lasted 43 days, with peak occurring first week May. Average mature female male body weights 6.4 ± 0.9 kg 7.0 1.0 respectively. total relative fecundity 5998 1404 eggs 946 210 kg−1 Female weight showed similar pattern correlation observed other salmonids. volume ejaculate 47.7 32.8 cm3 7.26...
Background: Blue-colored phenotypes have the potential to enhance external appearance of rainbow trout for marketing due their attractive skin coloration. However, further analyses are necessary assess overall performance fish farming purposes. Objective: To investigate a blue-colored strain in order determine whether growth and spotting variation skin, either number or size, related Blue Color Intensity on back (BCI). Method: A correlation analysis comparisons among separated into Low-...
En este trabajo se establecen las condiciones experimentales que permiten la obtención de ejemplares triploides en trucha arcoiris y los métodos citogenéticos para su diagnóstico. La aplicación un choque térmico 26.5"C. 20 min. después fecundación dio como resultado 79.09% con una sobrevida 95% al “estado ojos”. placas metafásicas embriones el estado pre ojos sugiere método más adecuado diagnóstico citogenético.
Calcium is a prerequisite factor for triggering the sperm activation in salmonids. The aim of this study was to test different concentrations Ca2+ on motility and fertility rainbow trout (Oncorhynchus mykiss). Semen samples activated with calcium free activator (0.0 mM) increasing CaCl2 (6.3, 7.9, 9.5 11 Mm) were evaluated by computer-assisted analysis (CASA). To assess fertility, eggs from three females fertilized semen each five solutions incubated until four-cell stage when rate symmetry...
Background: Skin pigmentation in fish is involved various biological processes. In salmonids, the interactions of skin spottiness with biometric and reproductive parameters are mostly unknown, especially naturalized populations influenced by different ecological factors. Objective: To associate variation broodstocks rainbow trout from southern Chile. Method: The number dark spots below lateral line was assessed male female two seasons, years 2007 2012, then this dataset associated same...