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  • Acipenser persicus  (1)
  • Rutilus frisii kutum
  • 2020-2022  (2)
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  • 1
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    Influence of food attractants (methionine, lysine and alanine) on sturgeon larvae and fingerlings nutrition (2021)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    In:  http://aquaticcommons.org/id/eprint/25597 | 18721 | 2018-10-07 11:09:13 | 25597 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-16
    Description: The objective of this study was to determine the influence of food attractants (methionine, lysine and alanine) on growth performance and survival rates of Acipenser percicus larvae and fingerlings during the acclimation period to the formulated diets. A total of 3300 Acipenser percicus larvae and 1500 Acipenser percicus fingerlings with the initial mean weights of 0.4±0.09 (mean±SD) and 1.8±0.3 (mean±SD) g, respectively were randomly distributed into 30 aerated plastic tanks of 30 L capacity for larval stage and 50 L capacity for fingerling stage provided with a water flow rate of 0.2 litre per second. This study was conducted at the International Sturgeon Research Institute for two periods of 62 and 70 days over two years. Nine iso-caloric diets were formulated to contain 0, 1 and 3 % of three amino acids methionine, lysine and alanine. In addition, a diet containing 50 % of plant protein supplemented with 3 % of methionine, lysine and alanine was also formulated to compare the effects of plant-protein-based diet with the experimental diets so as to prepare a cost-effective practical diet for this species. Fish were fed each of the ten experimental diets and a completely randomized design in a 3×3 factorial arrangement was used for the experiment. At the end of the feeding trial, final weight (7.5 ± 0.3 g) in Persian sturgeon larvae fed M3L1A3 diet (3% methionine and alanine and 1% lysine) was significantly higher than those of fish fed the other experimental diets (p≤0.05) and then M1L1A3 diet (1% methionine and lysine and 3% alanine) was significantly better (p≤0.05) than other experimental diets. There were no significant differences (p≥0.05) in final weights among M1L1A1, M3L1A1, M3L3A1, M1L3A3 and M3L3A3 diets, while theses diets showed significant differences in final weight with fish fed plant-protein-based diet (3.2±1 g) and without amino acids supplemented diet (M0L0A0) (3.6± 0.4 g). Based on final weigh obtained from Persian sturgeon fingerlings, there were significant differences (p≤0.05) between M3L3A3 (3% methionine, 3% lysine and 3% alanine) (11.1±3.6g) and M3L1A3 (3% methionine, 1% lysine and 3% alanine) (10.4±3.1g) diets with M1L1A1, M1L3A1, M1L1A3, M0L0A0 and plant-protein-based diets. Results of final weigh in fingerling stage also indicated that there were no significant differences (p≥0.05) among M1L1A1 (7±1.2 g), M3L1A1 (8.6±1.6 g), M1L3A1 (7±0.5 g) and M1L1A3 diets (6.6±1.0 g) with M0L0A0 (5.8±1.8 g) and plant-protein-based diets. Analysis of total length in Persian sturgeon fingerlings indicated that there were no significant differences (p≥0.05) among treatments. The highest total length (12±1.6 cm) was recorded in fish fed M3L1A3 diet. Results obtained from this study revealed that young growing Persian sturgeon has greater requirements for methionine in diet, while lysine and alanine at the levels of 1 and 3% for Persian sturgeon fingerlings and at the level of 3% for larvae stage show the same effects on growth performance. Hence, it may be concluded that the dietary alanine and lysine requirements for sturgeon larvae during the acclimation period to formulated diet is estimated to be more than 1 %. No significant differences were observed in survival rates in sturgeon larvae and fingerlings among treatments.
    Keywords: Aquaculture ; Iran ; Acipenser persicus ; Larvae ; Fingerlings ; Food attractants ; Methionine ; Lysine ; Alanine ; Growth ; Survival ; Sturgeon ; Nutrition
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 62
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  • 2
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    Age, growth, feeding regime reproduction and sexual maturity of Rutilus frisii Kutum in Iranian coastal waters of Caspian Sea (2021)
    Iranian Fisheries Science Research Institute | Tehran, Iran
    In:  http://aquaticcommons.org/id/eprint/25225 | 18721 | 2018-09-06 05:01:00 | 25225 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-16
    Description: The project of Age, growth, feeding regime and fecundity of Kutum (Rutilus frisii Kutum) survey started in south of the Caspian Sea from 2006 to 2007. The aim of project was related to determination of length maturity (Lm50%), identification of feeding animals, and investigation some of biological aspects uncluded in sex ratio, growth and age structure in southern of the Caspian Sea. Total 2706 specimens of Kutum were surveyed. The age structure of Kutum has nine age groups that included in 1, 2, 3, 4, 5, 6, 7, 8, and 9 years. The result showed that maximum frequency was about 39.3 % and were belong to 4 years and minimum frequency which was about o.1 % were belong to 9 years. The maximum and minimum fork length and weight were 58 and 21cm with mean (±SD) 38.4 (± 6.4) cm; 2450 and 104g with mean (±SD) 784.2 (± 383.30) g , respectively. There are significant different between fork length and weight in male and female of Kutum at difference months (ANOVA, P〈0.05). The sex ratio of males to female was 0.65: 1 (males: females). The least and high condition factor was 1.5 in January and 2.17 in October, respectively. Length maturity (Lm50%) was 39.07cm. Minimum and maximum absolute fecundity was varied from 15713 to 130737 eggs with mean (±SD) 69961.7 (± 3836.4). Significant different was between absolute fecundity with fork length and weight (p〈0.05). Gonadosomatic index (GSI) mean for females were 2.5±0.2 (autumn) and 17± 0.2 (spring); 1.2± 0.1 (autumn) and 4.1± 0.2 (spring) for males, respectively wich coincided to spawning period. The highest feeding intensity (Gastrosomatic index) for females was 313.9 ± 65.9 in October and 119.4 ±59.2 in March; 350.7 ±103.7 in October and 144.1±85.04 in March for males, respectively. There are significant different between GSI with male anfemale in difference months (ANOVA, p〈0.05). The Bertalanffy growth equation for all populations of Kutum was L (t) = 63.92[1-e ^0.19 (t (-1.00)]. Main prey mature of Kutum was Cerastoderma lamarki; Gastropoda and Balanus were subordinate, and Crab, Hypanis, Fish (Neogobous sp.) Algae, egg, and scale were random preys. Planktone groups comprise to Exuviaella, Nitzchia, Osillatoria, Synedra, Nematoda, Navicolla, Diatoma, Rholcosphenia were preys juvenile of Kutum. Based on ISI (Important species index), Cerastoderma lamarki and Balanus were dominant species in feeding of Kutum. As a result, growth, fecundity and length maturity of Kutum declined which may due to loss natural breeding area, overfishing (overlapping between fishing and spawning period) and artificial breeding that commenced since 1982. Hopefully, this information can be used in fisheries management.
    Keywords: Aquaculture ; Iran ; Caspian Sea ; Age ; Growth ; Feeding ; Regime ; Reproduction ; Sexual maturity ; Rutilus frisii kutum ; Coastal waters
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 58
    Location Call Number Limitation Availability
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