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  • 1
    Publication Date: 2018-01-08
    Description: The effects of feeding frequency on growth performance, feed conversion ratio and survival of post-larvae Indian white shrimp, Penaeus indicus were evaluated in a 56-day study. The study was conducted in sixteen fiberglass tanks provided with aerated re- circulating water with four replicate tanks for each treatment. Twenty post larvae with a mean weight of 1.56 0.02g were hand-counted and stocked into each of the replicate tanks and fed 2, 4, 6 and 8 times a day, respectively. Final body weights were measured significantly lower at 2 and 4 times/day (5.76 0.08 and 5.96±0.15g, respectively) than 6 and 8 times/day (8.54±0.16 and 8.31 0.19g, respectively) treatments (P〈0.05). There were significant differences for the Feed Conversion Ratio (FCR) of shrimps fed 6 and 8 times/day with other treatments. The best mean FCR was obtained from the sixth daily-feeding (P〈0.05). The Specific Growth Rate (SGR) of shrimps fed 6 times/ day was significantly (P〈0.05) higher (3.03 0.04%) than shrimps fed with all other feeding regimes, while shrimps fed 8 times/ day had a higher SGR (2.95 0.05%) than shrimps fed 2 times/day (2.36 0.06%) and 4 times/day (2.39 0.11%). Survival rate was significantly different (P〈0.05). The best mean survival rate was obtained from 6 times/day feeding (P〈0.05). There were significant differences for survival rates (P〈0.05). The water quality parameters (salinity, dissolved oxygen and temperature) were not different among treatments. However, some water quality parameters (ammonium, nitrate, nitrite, phosphate and pH) were significantly different among the treatments. Results suggested that there was an advantage in feeding P. indicus more frequently than 4 times per day.
    Keywords: Aquaculture ; Biology
    Repository Name: Aquatic Commons
    Type: Article , PeerReviewed
    Format: application/pdf
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  • 2
    Publication Date: 2018-10-19
    Description: The trawl fishing is used in the waters of the Persian Gulf and the Sea of ​​Oman to catch different kinds of aquatic animals by small and large trawler. One of the most important subjects is the rate and process of aquatic escapement during fishing and standardization of the nets. This research was designed to investigate fish escapement from different parts of the trawl. Sampling was carried out with four small pockets attached in different parts of the net. After six hauling operations, aquatic animals from all of the pockets were identified and measuring. Compare between pockets showed that T. lepturus with mean length of 72.5 cm had the highest value and S. insidiator with 5.2 cm length had the lowest one. In addition, S. tumbil with mean weight of 226 g had highest level while P. semisulcatus with the value of 1.7 g had lowest mean weight. Study of pockets showed highest escapements (64.52%) which was happened in the pocket close to cod end. Comparison between four pockets showed significant difference on amounts of aquatic escapement and the most escapements happened in the pockets close to cod end.
    Keywords: Fisheries
    Repository Name: Aquatic Commons
    Type: Article , PeerReviewed
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  • 3
    Publication Date: 2018-02-16
    Description: Every year, after fishing period, the sturgeon gillnets are assessed base on physical characters by the management of sturgeon fishes in Golestan Province. Net are put aside and replaced by new one if they qualification are not net. In spite of importance of strength ropes, unfortunately, there is a little research in this regards. In addition, previous research are not applied storage conditions and physical damages. Therefore, researcher are determined to do a research in this regards. For this reason some materials from new net, storage net, damaged net, put aside net, etc. collected and tested by an Instron. Then data analyzed by factorial test in complete randomized and variance and average compared in 5% significant level by SPSS version 17. The results shows that there is not significant difference between new net (blank) and new net kept in storage for two years in strength point (p〉0.05). However, there is significant difference in breaking point, damaged nets (p〈0.05). Regarding the effect of reducing, the net strength during the storage, lack of significant difference between new storage net, represents a quality loss in making of new nets
    Keywords: Engineering ; Fisheries
    Repository Name: Aquatic Commons
    Type: Article , PeerReviewed
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