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  • 1
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    The impact of ghost fishing on catch rate and composition in the southern Caspian Sea (2018)
    Elsevier
    Details
    Publication Date: 2018-10-01
    Print ISSN: 0025-326X
    Electronic ISSN: 1879-3363
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering
    Published by Elsevier
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  • 2
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    Study on mesh breaking strength of conical lift net before and after usage (2018)
    Details
    Publication Date: 2021-05-19
    Description: Conical lift nets catch kilka fish in Iran. Conical lift nets are usually made of polyamide 6.6 (nylon) with 210D/ 9 number. One of the main problems of fishermen is determining the right time to change fishing nets. Unfortunately, due to lack of data they do not change their nets at the right time. Data were analyses using and The mean values of breaking strength data were compared using one-way ANOVA and Duncan's test. The results showed that there is significant differences between new nets and nets which is used for 10 months (P〈0.05).
    Description: Published
    Keywords: Conical lift net ; Sprat Fishing ; Net strength length
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.1-5
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  • 3
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    Study of physical damage and storage effects on strength of sturgeon gillnet (2017)
    Details
    Publication Date: 2021-05-19
    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.
    Description: Published
    Keywords: Gillnet ; Strength ; Physical damage ; Storage ; Sturgeon ; Physical ; Quality
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.155-162
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  • 4
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    Assessing exploitation status of Caspian roach (Rutilus caspicus, Yakovlev, 1870) in southeast of the Caspian Sea (2019)
    Details
    Publication Date: 2021-05-19
    Description: Caspian roach (Rutilus caspius), is one of the most important commercial species in the Caspian Sea with a high level of catch fluctuations over the past decades mainly due to overfishing. In this study, data from 246 specimens caught from beach seine cooperative companies in the southeast coast of the Caspian Sea during the October 2014- April 2015 were analyzed. Results showed that the fish age were ranged between 3 to 10 years with fork lengths and weights ranging 14.5-32.1 cm and 70.7-437 g, respectively. The growth parameters of the von Bertalanffy equation were found as Lt=41.8 [1-e–0.12(t+0.766)]. The length-weight relationships were estimated to be WT= 0.0208 FL^2.9184 (R^2 =0.901) for females and WT= 0.0138 FL^3.0244 (R^2 =0.921) for males. Weight increased isometrical with the fork length for females and males. Total mortality, natural and fishing coefficients (Z, M, F) and exploitation rate (E) were estimated to be 1.239, 0.324, 0.916 year-1 and 0.74, respectively. Fish biomass and maximum sustainable yield (MSY) were equal to 417 Kg and 215 Kg, while the ration of cooperative companies catch was 28 Kg. Therefore, it is suggested that the Caspian roach stocks are severely exposed to overfishing, and there is an urgent need to efficient management for stock conversation.
    Description: Published
    Keywords: Rutilus caspius ; Caspian roach ; Biomass ; Growth parameters
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.67-76
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  • 5
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    An investigation of escapement status of aquatic animals from different parts of trawl nets by pockets in the coastal waters of Chabahar (2018)
    Details
    Publication Date: 2021-05-19
    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.
    Description: Published
    Keywords: Trawl ; Fish escape ; Pocket method ; Aquatic ; Coastal waters ; Investigation
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.1-9
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  • 6
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    Investigating the selectivity of gillnet used for catching the Crimson snapper (Lutjanus johni Bloch, 1792) by length-girth relationships in the coastal waters of Bandar Abbas (2018)
    Details
    Publication Date: 2021-05-19
    Description: Crimson snapper (Lutjanus johni Bloch, 1792) is the most important commercial species in the Persian Gulf and the Oman Sea. This species is caught by gillnets in the coastal waters of Bandar Abbas. In the present study, the gillnet with 17 cm stretched mesh size (knot to knot) is used for investigating the selectivity of gillnet used for catching the crimson snapper by length-girth relationships in the coastal waters of Bandar Abbas. Sampling was performed in May and July 2017. The total numbers of 1107 specimens were caught after 210 times of gillnetting. The weight, total standard length and girth of 4 points of body (locations of eyes, operculum, beginning of the dorsal fin and maximum girth) were measured for all specimens. Regression of length-girth, length-weight and selectivity curve were drawn based the data. Results showed that the total length was increased by increasing the body girth and weight of fish. Based on the body girth of two points including branch girth and maximum body girth, the selectivity of gillnet ranged from 62 to 76 cm in which the optimum length was 69 cm that is higher than Lm50. Therefore, it can be concluded that gillnet with 17 cm mesh size is suitable for catching crimson snapper.
    Description: Published
    Keywords: Lutjanus johni ; Gillnet ; Length-weight relationships ; Length–girth relationships ; Species ; Crimson snapper
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.11-18
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  • 7
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    Effects of feeding frequency on growth, survival and water quality of rearing tanks of the Indian white shrimp (Penaeus indicus) (2017)
    Details
    Publication Date: 2021-05-19
    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.
    Description: Published
    Keywords: Shrimps ; Penaeus indicus ; Nutrition ; Feed Conversion Ratio ; Feeding ; Frequency ; Growth ; Survival ; Water quality
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.129-136
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