The heterogeneous and homogeneous growth (HmG) assumptions in an intensive tilapia Oreochromis niloticus pre-grow-out production were evaluated under the different stocking scenarios. Four models (von Bertalanffy, Logistic, Pütter, Gompertz) tested modified to include effect of density difference. Models with fitted using a nonlinear regression, while (HtG) parameterized quantile (0.05, 0.15, 0...

Drawing on more than a decade of research on the social implications of systems thinking, as well as practical experience in integrative, community-based approaches to education, this paper is an inquiry into philosophical and ethical considerations growing out of recent developments in systems thinking. In his foundational work on general system theory, Ludwig von Bertalanffy distinguishes bet...

The growth of Brycinus longipinnis caught at Aghien Lagoon was studied between June 2014 and May 2015 through type, condition factor parameters according to the Von Bertalanffy model. Sampling conducted using experimental fisheries. Growth type determined from length-weight relationship model FiSAT software. negative allometric (b = 2.59). population grows faster towards asymptotic length ((L∞ ...

In acoustic sampling for fish, thresholding is normally applied to eliminate the unwanted contribution of noise to the integrator output. Since thresholding discriminates against small targets. this technique cannot be used for the quantitative study of these small targets in the presence of larger ones, When the integrator output (area backscattering coefficient, .I'd) due to one size class of...

MOTIVATION In flux balance analysis of genome scale stoichiometric models of metabolism, the principal constraints are uptake or secretion rates, the steady state mass conservation assumption and reaction directionality. Here, we introduce an algorithmic pipeline for quantitative assignment of reaction directionality in multi-compartmental genome scale models based on an application of the seco...

In this study growth characteristics of 815 tuwini (Capoeta trutta) in Shour River were investigated during July 2010 through June 2011. The population was composed of 62.94% females and 32.02% males. Sex ratio was 1: 1.96, with significant differences observed at 1:1 (x2= 150.6 df= 1 p<0.05). The age distribution of this population ranged from <1 to 6 years. The distribution of length and wei...

In order to determine the age structure, growth, and length-weight relationship of the mudskipper, Periophthalmus waltoni, from coastal mudflats of Qeshm Island, Soroo and Bandar-pol, in Hormuzgan Province, Iran, we collected 192 individuals in February 2007. Age was determined using the second pectoral radial bone and year class was based on length-frequency distributions. Growth was descr...

Determining the age of individuals in a population can lead to a better understanding of population dynamics through age structure analysis and estimation of age-specific fecundity and survival rates. Shoulder height has been used to accurately assign age to free-ranging African savanna elephants. However, back length may provide an analog measurable in aerial-based surveys. We assessed the rel...

This study was carried out during May 2010 – April 2011 in order to determine various biological properties of red mullet occurring in the Eastern Black Sea region. The average length and weight of 1435 specimens were determined as 13.13 cm and 23.14 g, respectively. Weight-length relationship was determined as W = 0.0088 L3.0338. The age distribution of this population ranged between I and VII...

  Estimates of age, growth parameters, length-weight relationship and length and age at first maturity of the otolithes ruber are required for fishery management. We used counting annuli on the section of sagittal otoliths to age O.ruber from the Northwest Persian Gulf in south of Iran. Estimated ages ranged from 0 to 6 years, and maximum frequency of fishes was observed in age-group 1. The val...