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  • Bony fish  (2)
  • Copepoda  (2)
  • 1
    Publication Date: 2021-05-19
    Description: Bony fish stocks are being legally utilized by 134 fishing cooperatives in the Iranian side of the Caspian Sea mainly through beach seine. This fishing method has been invariantly used over the past. Fifty years with actually no alteration or technical modifications in the fishing nets despite the substantial changes in the quality & quantity of bony fish resources. Based on the data obtained from the stock assessment project for bony fish, the amount of premature or young fish (substandard size) caught during the past decade has been far greater than those of authorized fish size and even the figures far certain species suggest heavy over fishing to such an extent that in the case of frisii kutum, there has been a reduction by 50% in the overall kutum landings.Thus in order to modify the technical design of the fishing with a view to alleviate the catch of non-standard fish and whereby prevent over fishing by beach seine, it seems imperative therefore to launch a biometric study on bony fish stocks particularly the two intended fish species namely Rutilus frisii kutum and mullet which would involve identification of their standard weight and length using pertinent mathematical equations as well as determining proper mesh size of the code-end and other parts of the nets & consequently the H. R, d/a coefficients. The operations related to project were carried out in the "Inland Aquaculture Research Institute" net mating plant and beach seine site in Anzali during 2005-7 which aimed at designing and constructing standardized beach seines and comparing the fishing performance & yields with those of ordinary beach seine nets under equal conditions with a ratio of 3:1. The results concerning the quality and quantity of fish caught during a whole fishing cycle were recorded in the related data forms. The statistical analysis consisting the comparison of the quality of fishing performance in both the experimental and control beach seine nets was made using T. student and excel, spss 12 software packages. The results indicated that the reduction in the amount of non-standard fish caught in standardized beach seine net (the experimental net) was meaningfully different from that of the ordinary (control) net showing the superior fishing performance of the former. The catch level of non-standard R.frisii kutum decreased from 67.1% in the control beach seine net down to 7.1% in the standardized beach seine net and these figures for mullet were 29.98% and 1.1% respectively. Based on the results obtained and considering the apparent superiority of the experimental net in catching greater number of mature fish and less number of premature or non-standard sized fish, the use of this modified beach seine net can be proposed to Iranian fisheries organization as a viable alternative to the traditional beach seine nets.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Beach seine net ; Rutilus frisii kutum ; Mullet ; Standard sized fish ; Non-standard sized fish ; Bony fish ; Fishing ; Stock assessment ; R.frisii kutum
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 84pp.
    Location Call Number Expected Availability
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  • 2
    Publication Date: 2021-05-19
    Description: This study was carried out during two years study from oct. 2005. to sep. 2007 in Bahrekan coastal waters in Northwest of Persian Gulf. Sampling was done from 5 station (4 station in artificial reef site and one station in muddy soft bottom area as a control site). monthly sampling was done for water, phytoplankton, zooplanktons and Ichtyoplankton fauna and seasonal sampling for benthos, attached benthic animals on reefs and also for fish seasonally. Except for nitrate the mean values of all the physical and chemical parameters didn t show any significant differences between artificial reef stations and control site. Although there were significant differences in some parameters such as salinity, total hardness and po4 3- during two years study. Phytoplankton including 30 genus, and Cheatoceros, Eucompia, Lauderia, from diatoms were the most abundant genus. No significant differences were observed in abundant phytoplankton in two years study. The range of chlorophyll was 0.19- 1.25 (mg/m3 chl). Values showed variations during two years study and the lowest values in spring and the highest values in autumn were observed. Zooplankton groups were included to crustacean, mollusk larvae, polychaet larvae, protozoa and few numbers of echinodermata larvae, cheatognatha and larvacea. The most abundant zooplankton were copepoda with 81% intwo years study. Copepods were observed with 81 and 71 percent in control and reef site respectively. Zooplankton density in summer and autumn was high than other seasons. Diversity index in reef stations were more than control site and echinodermat larvae were observed only in reef site. Diversity in the first year of study were found more than in the second year of study. Fish larvae in different months were showed same variations in control and reef sites and fish larval abundance in reef stations were more than control site. Soleidae larvae in the first year of study and sparidae larvae in the second year of study were the most abundant fish larvae in area. Other fish larval families were found more abundant in reef stations than control site. Fish larvae were observed more abundant in spring and autumn than summer and winter. 16 and 34 taxa of macrobentos were identified in the first and second year of study respectively. The most dominant groups were bivalue, echinodermata, polychaets and crustacean. Macrobetntos density showed ascending trend in reef stations. Macrobentos density and biomass in control site in the first year of study was more than the reef site, but in the second year of study increased in reef site. Generaly 14 and 74 groups of attached fauna were observed in the first and second year of study respectively, and the most dominant groups were barnacles, anthozoa, spongs, bryozoans, echinodermata, isopoda, polychaets and gastropods. 42 species of decapods crustacean and coelenterate only in reef site and 12 species of mollusk only in control site were observed. 18 species were common between two sites. Biomass variations were observed in different seasons and the highest biomass were found in winter due to barnacle abundance. 16 species of fish were identified and some small ornamental fishes observed in artificial reefs. Sparidae species were the most divers and serranidae species were most abundant in area. The number of economic fish species and individuals. Showed ascending trend in reef site but sever decreasing were observed in summer 2007. This species were much more in mixed reef site (c). The major caught species in reef site were Epinephelus coioides, Acanthpagrus latus, Diagrama pictum and Sepia sp.. The mean weight of Epinephelus coioides in first year of study were more than second year. The number of fish species and caught weight in mixed reef site (c) were more than other stations in two year study. And Epinephelus coioides were the most.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Artificial reefs ; Phytoplankton ; Zooplankton ; Ichtyoplankton ; Bentos ; Attached amimals ; Fish ; Cheatoceros ; Eucompia ; Lauderia ; Polychaet larvae ; Protozoa ; Echinodermata ; Cheatognatha ; Copepoda
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 133pp.
    Location Call Number Expected Availability
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  • 3
    Publication Date: 2021-07-16
    Description: Bony fish stocks are being legally utilized by 134 fishing cooperatives in the Iranian side of the Caspian Sea mainly through beach seine. This fishing method has been invariantly used over the past. Fifty years with actually no alteration or technical modifications in the fishing nets despite the substantial changes in the quality & quantity of bony fish resources. Based on the data obtained from the stock assessment project for bony fish, the amount of premature or young fish (substandard size) caught during the past decade has been far greater than those of authorized fish size and even the figures for certain species suggest heavy over fishing to such an extent that in the case of frisii kutum, there has been a reduction by 50% in the overall kutum landings. Thus in order to modify the technical design of the fishing with a view to alleviate the catch of non-standard fish and whereby prevent over fishing by beach seine, it seems imperative therefore to launch a biometric study on bony fish stocks particularly the two intended fish species namely Rutilus frisii kutum and mullet which would involve identification of their standard weight and length using pertinent mathematical equations as well as determining proper mesh size of the code-end and other parts of the nets & consequently the H. R, d/a coefficients. The operations related to project were carried out in the "Inland Aquaculture Research Institute" net mating plant and beach seine site in Anzali during 2005-7 which aimed at designing and constructing standardized beach seines and comparing the fishing performance & yields with those of ordinary beach seine nets under equal conditions with a ratio of 3:1. The results concerning the quality and quantity of fish caught during a whole fishing cycle were recorded in the related data forms. The statistical analysis consisting the comparison of the quality of fishing performance in both the experimental and control beach seine nets was made using T. student and excel, spss 12 software packages. The results indicated that the reduction in the amount of non-standard fish caught in standardized beach seine net (the experimental net) was meaningfully different from that of the ordinary (control) net showing the superior fishing performance of the former. The catch level of non-standard R.frisii kutum decreased from 67.1% in the control beach seine net down to 7.1% in the standardized beach seine net and these figures for mullet were 29.98% and 1.1% respectively. Based on the results obtained and considering the apparent superiority of the experimental net in catching greater number of mature fish and less number of premature or non-standard sized fish, the use of this modified beach seine net can be proposed to Iranian fisheries organization as a viable alternative to the traditional beach seine nets.
    Keywords: Fisheries ; Iran ; Caspian Sea ; Anzali ; Beach seine net ; Rutilus frisii kutum ; Mullet ; Standard sized fish ; Non-standard sized fish ; Bony fish ; Fishing ; Stock assessment ; R.frisii kutum
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 84
    Location Call Number Expected Availability
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  • 4
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    Unknown
    Iranian Fisheries Science Research Institute | Tehran, Iran
    In:  http://aquaticcommons.org/id/eprint/25135 | 18721 | 2018-08-26 16:49:01 | 25135 | Iranian Fisheries Science Research Institute
    Publication Date: 2021-07-16
    Description: This study was carried out during two years study from oct. 2005. To sep. 2007 in Bahrekan coastal waters in Northwest of Persian Gulf. Sampling was done from 5 station (4 station in artificial reef site and one station in muddy soft bottom area as a control site). Monthly sampling was done for water, phytoplankton, zooplanktons and Ichtyoplankton fauna and seasonal sampling for benthos, attached benthic animals on reefs and also for fish seasonally. Except for nitrate the mean values of all the physical and chemical parameters didn t show any significant differences between artificial reef stations and control site. Although there were significant differences in some parameters such as salinity, total hardness and po4 3- during two years study. Phytoplankton including 30 genus, and Cheatoceros, Eucompia, Lauderia, from diatoms were the most abundant genus. No significant differences were observed in abundant phytoplankton in two years study. The range of chlorophyll was 0.19- 1.25 (mg/m^3 chl). Values showed variations during two years study and the lowest values in spring and the highest values in autumn were observed. Zooplankton groups were included to crustacean, mollusk larvae, polychaet larvae, protozoa and few numbers of echinodermata larvae, cheatognatha and larvacea. The most abundant zooplankton were copepoda with 81% intwo years study. Copepods were observed with 81 and 71 percent in control and reef site respectively. Zooplankton density in summer and autumn was high than other seasons. Diversity index in reef stations were more than control site and echinodermat larvae were observed only in reef site. Diversity in the first year of study were found more than in the second year of study. Fish larvae in different months were showed same variations in control and reef sites and fish larval abundance in reef stations were more than control site. Soleidae larvae in the first year of study and sparidae larvae in the second year of study were the most abundant fish larvae in area. Other fish larval families were found more abundant in reef stations than control site. Fish larvae were observed more abundant in spring and autumn than summer and winter. 16 and 34 taxa of macrobentos were identified in the first and second year of study respectively. The most dominant groups were bivalue, echinodermata, polychaets and crustacean. Macrobetntos density showed ascending trend in reef stations. Macrobentos density and biomass in control site in the first year of study was more than the reef site, but in the second year of study increased in reef site. Generaly 14 and 74 groups of attached fauna were observed in the first and second year of study respectively, and the most dominant groups were barnacles, anthozoa, spongs, bryozoans, echinodermata, isopoda, polychaets and gastropods. 42 species of decapods crustacean and coelenterate only in reef site and 12 species of mollusk only in control site were observed. 18 species were common between two sites. Biomass variations were observed in different seasons and the highest biomass were found in winter due to barnacle abundance. 16 species of fish were identified and some small ornamental fishes observed in artificial reefs. Sparidae species were the most divers and serranidae species were most abundant in area. The number of economic fish species and individuals. Showed ascending trend in reef site but sever decreasing were observed in summer 2007. This species were much more in mixed reef site (c). The major caught species in reef site were Epinephelus coioides, Acanthpagrus latus, Diagrama pictum and Sepia sp.. The mean weight of Epinephelus coioides in first year of study were more than second year. The number of fish species and caught weight in mixed reef site (c) were more than other stations in two year study. And Epinephelus coioides were the most.
    Keywords: Aquaculture ; Iran ; Persian Gulf ; khouzestan province ; Bahrekan coastal waters ; Artificial reefs ; Phytoplankton ; Zooplankton ; Ichtyoplankton ; Bentos ; Attached amimals ; Fish ; Cheatoceros ; Eucompia ; Lauderia ; Polychaet larvae ; Protozoa ; Echinodermata ; Cheatognatha ; Copepoda
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 133
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
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