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Length weight relationship, condition factor and length at first maturity of Indian halibut Psettodes erumei in the Persian Gulf
Zahra Azh, Iman Sourinejad, Ehsan Kamrani, Mehdi Ghodrati Shojaei,
Volume 3, Issue 2 (Autumn 2013)
Abstract
Length weight relationship, condition factor and length at first maturity of Indian halibut Psettodes erumei were investigated in the Persian Gulf by monthly sampling of 30 fish from March to February 2012. Mean value of total length and weight were 38.68 ± 9.39 cm and 986.92 ± 756.79 gr, respectively. Maximum and minimum values of total length were in August (44.43 ± 6.37 cm) and March (23.27 ± 2.32 cm), respectively. Maximum and minimum values of body weight were in January (1540.73 ± 1358.69 g) and March (134.52 ± 40.13 g), respectively. Analysis of length frequency distribution showed that the most frequent length category was the category of 39-42 cm with 56 fish that is equivalent to 17.89% of total samples. 52.4% of caught fish had a total length less or equal to 39 cm. Total length-weight relation in Psettodes erumei was calculated as W=0.005TL3.284 with R2= 0.973. Regarding significant difference between the estimated b and the number 3 with 0.95% confidence, the growth type of this species was determined to be positive allometric in the Persian Gulf. Condition factor was calculated to be 1.57 in Psettodes erumei in the Persian Gulf waters. Condition factor has increased from March to July and then decreased to December. Length at first maturity was estimated to be 39.3 cm of total length in Psettodes erumei.
Length-weight relationship and growth pattern of Turkmenian loach (Paraschistura sargadensis) living in Aran qanat, Baft city
Zahra Azh, Iman Sourinejad, Seyed Ali Johari,
Volume 5, Issue 2 (Autumn 2015)
Abstract

Regarding the importance of studying inland water fishes specially the fish living in qanats, some morphology characteristics, length-weight relationship and growth type of Turkmenian loach Paraschistura sargadensis living in Aran qanat, Baft city were assessed by standard protocols. Range of total length was 25.1-51.38 mm, standard length was 20.65-43.10 mm, fork length was 23.41-46.85 mm, body depth was 2.97-4.66 mm and the weight of fish was 0.12-0.81 g. Total length- weight relation was as W=0.000012TL2.86 with r2= 0.978. According to the results of Pauly test, the value of “b” obtained had a significant difference with value of “3” and hence, the growth type of this species is allometric in Aran qanat.


Cultivation of Chironomid larvae (DIPTERA) using different levels of prebiotics and its effect on growth performance of Siberian sturgeon (Acipenser baerii) fingerlings
Mr. Mohammad Amini Vishekae, Dr. Majidreza Khoshkholgh, Dr. Bahram Falahatkar, Dr. Zabiollah Pazhand,
Volume 15, Issue 1 (Spring 2025)
Abstract
The use of prebiotics in aquaculture has been shown to enhance growth performance, improve immune function, and increase disease resistance by modulating the gut microbiota. This study aimed to investigate the effects of the prebiotic Prodi 450 (containing mannan oligosaccharides and beta-glucans) on the growth performance and total biomass of chironomid larvae, which were used as food for Siberian sturgeon (Acipenser baerii) fingerlings. The study was conducted in two phases: first, to assess the impact of different prebiotic levels on chironomid larvae, and second, to evaluate the subsequent effects on sturgeon growth. Four treatment groups were prepared, each with a different dosage of Prodi 450: control (0 mg), P250 (250 mg), P500 (500 mg), and P750 (750 mg) per kg of chicken manure. This manure was used as a substrate for rearing chironomid larvae, with three replicates per treatment. After 10 days of cultivation at 25.71 ± 0.79°C, the larvae were harvested. The larvae were then fed to Siberian sturgeon fingerlings (initial average weight of 1.14 ± 0.04 g) for 14 days to evaluate the effects on their growth performance and immune indicators. The results showed that the highest average larval weight was observed in the P250 treatment (8.50 ± 0.50 mg). The P500 treatment exhibited the second-best growth performance, which was not significantly different from P250 but significantly higher than the control and P750 treatments (p<0.05). There were no significant differences in total biomass per unit area among the treatments (p>0.05). For the Siberian sturgeon, there were no significant differences in growth indices (p>0.05), although the P500 treatment exhibited slightly higher growth in most indices. In conclusion, while the prebiotic supplementation did not significantly increase the total biomass of chironomid larvae per unit area, it did produce heavier larvae, particularly at the P250 and P500 levels. However, the prebiotic supplementation did not significantly affect the growth performance of Siberian sturgeon fingerlings over the 14-day feeding period.

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