Showing 4 results for Growth Parameter
Ahmad Alaei, Seyed Yousef Paighambari, Ali Salarpouri, Zohre Mazaheri,
Volume 3, Issue 3 (1-2014)
Abstract
Sind sardine Sardinella sindensis (Day, 1878) is the most important ecological and commercial surface resources in Persian Gulf and Oman sea. This study was carried to study some population dynamics parameters of Sind sardine in Coastal waters of Jask Province during January 2011 to December 2012. A totall 2887 specimens were collected from commercial fishing Purse seiners, monthly. Biometric parameters were measured. The mean length and weight were 14 cm, 29 g respectively and the most dominated length group was 14-15 cm (24.7%). The Von Bertalanffy growth parameters were calculated as L=19.5 (cm), k=1.18 (year-1), t0 = -0.18. Weight- length relationship showed an isometric growth and it was W = aL3.0522 (r2= 0.9432). The natural (M), fishing (F) and total (Z) mortality were 2.19, 0.87 and 3.06 per year respectively. The exploitation rate (E) was 0.29.
Sara Hagh Parast, Hadi Raeisi, Behzad Rahnema, Ahmad Reza Jebeleh,
Volume 6, Issue 2 (10-2016)
Abstract
In the present study, we investigated biological characteristics and population dynamics of long-spined tripodfish, Pseudotriacanthus strigilifer, in coastal waters of Hormozgan province. A total of 391 fish samples were collected from September 2014 until September 2015 by the set net of Moshta. Length frequency data were analyzed using FiSAT software and ELEFAN 1 method. The longest and the shortest fish sample was 28.5 and 3.1 cm, respectively, and the minimum and the maximum weights of the fish were 0.8 and 297.07 g, respectively. The value of b was estimated 3.39 with a positive allometric growth pattern. The growth functionality index of phi-monro (ϕ) was 2.98. Von Bertalanffy growth factors (VBGF) were calculated (L∞=29.8 cm, k=1.1 year-1, t0=-0.14). W∞ was obtained 302.09 g. The total, natural and fishery mortality rates were 2.35, 1.86 and 0.49 year-1. Catch probability of each length range in long-spined tripodfish was obtained L25=10, L50=12, and L75=13 cm.
Shiva Nedaei , Ahmad Noori, Alireza Valipour , Ali Asghar Khanipour , Seyed Hossein Hoseinifar,
Volume 8, Issue 1 (7-2018)
Abstract
The aim of this study was to evaluate the effects of Lactobacillus plantarum supplementation as probiotic on body composition, growth performance, nutrient efficiency indices, and survival in Astacus leptodactylus. For this purpose, 96 crayfishes (27.88 ± 0.27) were randomly distributed into twelve 100-liter fiberglass tanks, (eight crayfish per tank). Crayfishes were fed with different levels of L. plantarum inclusion comprising 0 (control), 107 (T1), 108 (T2) and 109 (T3) CFU g-1 diet for97 days. Feeding was conducted at a rate 1.5 % of body weight on a daily basis at 9 am and 4 pm. At the end of the feeding trials, crayfish in the T3 showed significantly higher protein and lipid levels compared to the control (P < 0.05). Moreover, protein and lipid efficiency ratio (PPV and LPV respectively) were enhanced in the T3 compared to the control (P < 0.05). In the present study, none of the probiotic supplemented groups showed significant differences in the growth performance parameters and survival rate compared to the control (P > 0.05). These results revealed efficiency of L. plantarum as probiotic on body composition and nutrient efficiency indices in A. leptodactylus.
Phd Student Mojtaba Naderi, Dr Seyed Abbas Hosseini, Dr Seyed Aliiakbar Hedayati, Dr Jamileh Pazooki, Professor Mariano Lastra,
Volume 8, Issue 2 (10-2018)
Abstract
In this study, sexual dimorphism and growth traits of
Ocypode rotundata were investigated. 736 individuals were collected in Qeshm Island, eastern Persian Gulf, from February 2015 to January 2016. 392 males (mean carapace width of 35.33 mm) and 344 females (mean carapace width of 32.94 mm) were examined to estimate morphometric parameters. All the measured parameters except for the body height ratio showed significant differences between two sexes (P < 0.05). Allometric growth was obtained for both sexes. Condition factor was significantly higher in males (0.051) than that of females (0.05). Monthly variation in the condition factor was correlated with temperature variation and the lowest condition factor was observed in winter. Asymptotic carapace width (CW∞), growth rate (k) and maximum life span were estimated as 60.2 mm, 0.73 per year and 4 years for males,and 54 mm, 1.2 per year and 2.5 years for females, respectively. Based on these results, growth parameters were different between sexes. Also, the morphometric traits showed sexual dimorphism in this species. Condition factor was affected by the monthly temperature variation. The results derived of this study will help in determining strategies for further conservation and management policies to preserve the biodiversity of sandy beaches.
