The proximate composition and fatty acid profile of five lots of samples of raw and roasted salt-dried sardines (Sardi-nella brasiliensis) bought locally in Maringá, Paraná State, Brazil were determined. Sig...The proximate composition and fatty acid profile of five lots of samples of raw and roasted salt-dried sardines (Sardi-nella brasiliensis) bought locally in Maringá, Paraná State, Brazil were determined. Significant differences (P < 0.05) were observed between samples of raw and roasted sardines, both in relation to moisture, total lipids, proteins, and ashes. The major fatty acids in raw and roasted sardine samples were docosahexaenoic acid (DHA, 22: 6n-3, 35.98%, 12.46%);palmitic acid (16: 0, 37.59%;24.18%), and eicosapentaenoic acid (EPA, 20: 5n-3, 6.62%;2.95%), respec-tively. The ratios of polyunsaturated to saturated fatty acid (PUFA/SFA) were 1.32 and 0.33, and the n-6/n-3 ratios were 0.07 and 0.13 in raw and roasted sardines, respectively. The results showed that roasting increased the SFA and reduced the PUFA in sardines, which still were rich in PUFA and remained a low-cost and nutritionally healthy food.展开更多
Knowledge of population genetic structure plays an important role in fisheries management.In this research,In-ter-Simple-Sequence-Repeat(ISSR)markers were employed to evaluate the genetic structure of Japanese sardine...Knowledge of population genetic structure plays an important role in fisheries management.In this research,In-ter-Simple-Sequence-Repeat(ISSR)markers were employed to evaluate the genetic structure of Japanese sardinella(Sardinella zun-asi)populations in the Northwest Pacific.Eighty seven individuals from 5 locations were screened using 4 highly polymorphic prim-ers.A total of 173 polymorphic loci were detected out of 191 loci amplified.Small but significant genetic differentiation was de-tected between the Chinese and Japanese populations by both AMOVA and pairwise FST analyses,which was further supported by cluster analysis.We consider that climate change during glaciations should be responsible for the genetic differentiation.Isolation by geographic distance among populations was observed,indicating that the distance might also lead to the genetic differentiation.However,no genetic structure was found within the populations off both the Chinese and Japanese coasts,indicating a high-level along-coast gene flow,which might result from ocean current transport and common ground for over-wintering.展开更多
Sardinella maderensis is one of the fish species well appreciated in Benin. In recent years, this species has experienced a decrease in its production in the coastal waters of this country. To search for the causes of...Sardinella maderensis is one of the fish species well appreciated in Benin. In recent years, this species has experienced a decrease in its production in the coastal waters of this country. To search for the causes of this decline in production, a standard survey was carried out using Computed Assisted Personal Interviewing with the 38 artisanal fishermen at the artisanal fishing port of Cotonou who targets this species in order to inquire about the fishing gear and techniques of production. The current stock status of this species was determined using FiSAT from a sample of 1240 specimens collected randomly in commercial catches from January to December 2021. The typical survey revealed a massive use of non-regulatory fishing mesh gear (86.85%). The fishing effort is also sustained and results in a fishing mortality rate (F = 2.88 yr<sup>-1</sup>) higher than the rate of natural mortality (M = 2.22 yr<sup>-1</sup>) suggesting overfishing of the stock. Sustainable management through capacity building of fishermen and application of regulations in terms of gear mesh size and respect for fishing seasons could be stated.展开更多
Objective:To determine Fe,Cu,Zn,Pb and Cd concentrations in muscle of sind sardinella[Sardinella sindensis(S.sindensis)]from Balochistan coast,Pakistan.Methods:S.sindensis were collected from Balochistan coast,Pakista...Objective:To determine Fe,Cu,Zn,Pb and Cd concentrations in muscle of sind sardinella[Sardinella sindensis(S.sindensis)]from Balochistan coast,Pakistan.Methods:S.sindensis were collected from Balochistan coast,Pakistan,at autumn inter monsoon,north east monsoon,spring inter monsoon and south west monsoon during October 2005-September 2006.All samples were analyzed for Fe,Cu,Zn,Pb and Cd by AAnalyst 700 flame atomic absorption spectrophotometer.Results:Generally,S.sindensis caught from Balochistan coast showed the accumulation level of Fe[(16.88±5.60)μg/g],Cu[(2.74±1.89)μg/g],Cd[(0.29±0.25)μg/g],Zn[(4.29±2.31)μg/g]and Pb[(0.24±0.24)μg/g]in the muscle tissues.Conclusions:The metal concentrations in fish from Balochistan coast observed in this study were lower than the limit values.Therefore,all metal accumulations in S.sindensis have to be monitored continuously,especially in this region.展开更多
Objective:To estimate the biological and population parameters required for proposing a preparation to sustain and manage this valuable fish resource.Methods:Aging was done by scales reading,and growth was estimated b...Objective:To estimate the biological and population parameters required for proposing a preparation to sustain and manage this valuable fish resource.Methods:Aging was done by scales reading,and growth was estimated by using the back-calculation method.The values of growth parameters L_(∞),k and t_(o)were calculated by von Bertalanffy model.Results:The results of growth parameters L_(∞),k and t_(o)were 28.36 cm,0.184 per year and-0.8437 per year,respectively.Mortality coefficient,survival and exploitation rates estimated to perceive yield per recruit and biomass per recruit.Conclusions:Biological reference points and virtual population analysis were prepared to plan appropriate managements forSardinella aurita fisheries.展开更多
Objective:To analyze the quantitative and qualitative properties of the extracted fish oil from Sardinella longiceps(S.longiceps).Methods:Four size groups of S.longiceps were examined for the extraction of fish oil ba...Objective:To analyze the quantitative and qualitative properties of the extracted fish oil from Sardinella longiceps(S.longiceps).Methods:Four size groups of S.longiceps were examined for the extraction of fish oil based on length.The size groups included Group I(size range of 7.1-10.0 cm),Group II(size range of 10.1-13.0 cm),Group III(size range of 13.1-16.0 cm)and Group IV(size range of 16.1-19.0 cm).Fish oil was extracted from the tissues of S.longiceps by direct steaming method.The oil was then subjected to the determination of specific gravity,refractive index,moisture content,free fatty acids,iodine value,peroxide value,saponification value and observation of colour.Results:The four groups showed different yield of fish oil that Group IV recorded the highest values of(165.00±1.00)mL/kg followed by Group III[(145.66±1.15)mL/kg]and Group II[(129.33±0.58)mL/kg],whereas Group I recorded the lowest values of(78.33±0.58)mL/kg in monsoon season,and the average yield was(180.0±4.9)mL/kg fish tissues.These analytical values of the crude oil were well within the acceptable standard values for both fresh and stocked samples.Conclusions:The information generated in the present study pertaining to the quantitative and qualitative analysis of fish oil will serve as a reference baseline for entrepreneurs and industrialists in future for the successful commercial production of fish oil by employing oil sardines.展开更多
文摘The proximate composition and fatty acid profile of five lots of samples of raw and roasted salt-dried sardines (Sardi-nella brasiliensis) bought locally in Maringá, Paraná State, Brazil were determined. Significant differences (P < 0.05) were observed between samples of raw and roasted sardines, both in relation to moisture, total lipids, proteins, and ashes. The major fatty acids in raw and roasted sardine samples were docosahexaenoic acid (DHA, 22: 6n-3, 35.98%, 12.46%);palmitic acid (16: 0, 37.59%;24.18%), and eicosapentaenoic acid (EPA, 20: 5n-3, 6.62%;2.95%), respec-tively. The ratios of polyunsaturated to saturated fatty acid (PUFA/SFA) were 1.32 and 0.33, and the n-6/n-3 ratios were 0.07 and 0.13 in raw and roasted sardines, respectively. The results showed that roasting increased the SFA and reduced the PUFA in sardines, which still were rich in PUFA and remained a low-cost and nutritionally healthy food.
基金supported by the Special Research Foundation for Public Welfare Marine Program (200905019-2)
文摘Knowledge of population genetic structure plays an important role in fisheries management.In this research,In-ter-Simple-Sequence-Repeat(ISSR)markers were employed to evaluate the genetic structure of Japanese sardinella(Sardinella zun-asi)populations in the Northwest Pacific.Eighty seven individuals from 5 locations were screened using 4 highly polymorphic prim-ers.A total of 173 polymorphic loci were detected out of 191 loci amplified.Small but significant genetic differentiation was de-tected between the Chinese and Japanese populations by both AMOVA and pairwise FST analyses,which was further supported by cluster analysis.We consider that climate change during glaciations should be responsible for the genetic differentiation.Isolation by geographic distance among populations was observed,indicating that the distance might also lead to the genetic differentiation.However,no genetic structure was found within the populations off both the Chinese and Japanese coasts,indicating a high-level along-coast gene flow,which might result from ocean current transport and common ground for over-wintering.
文摘Sardinella maderensis is one of the fish species well appreciated in Benin. In recent years, this species has experienced a decrease in its production in the coastal waters of this country. To search for the causes of this decline in production, a standard survey was carried out using Computed Assisted Personal Interviewing with the 38 artisanal fishermen at the artisanal fishing port of Cotonou who targets this species in order to inquire about the fishing gear and techniques of production. The current stock status of this species was determined using FiSAT from a sample of 1240 specimens collected randomly in commercial catches from January to December 2021. The typical survey revealed a massive use of non-regulatory fishing mesh gear (86.85%). The fishing effort is also sustained and results in a fishing mortality rate (F = 2.88 yr<sup>-1</sup>) higher than the rate of natural mortality (M = 2.22 yr<sup>-1</sup>) suggesting overfishing of the stock. Sustainable management through capacity building of fishermen and application of regulations in terms of gear mesh size and respect for fishing seasons could be stated.
文摘Objective:To determine Fe,Cu,Zn,Pb and Cd concentrations in muscle of sind sardinella[Sardinella sindensis(S.sindensis)]from Balochistan coast,Pakistan.Methods:S.sindensis were collected from Balochistan coast,Pakistan,at autumn inter monsoon,north east monsoon,spring inter monsoon and south west monsoon during October 2005-September 2006.All samples were analyzed for Fe,Cu,Zn,Pb and Cd by AAnalyst 700 flame atomic absorption spectrophotometer.Results:Generally,S.sindensis caught from Balochistan coast showed the accumulation level of Fe[(16.88±5.60)μg/g],Cu[(2.74±1.89)μg/g],Cd[(0.29±0.25)μg/g],Zn[(4.29±2.31)μg/g]and Pb[(0.24±0.24)μg/g]in the muscle tissues.Conclusions:The metal concentrations in fish from Balochistan coast observed in this study were lower than the limit values.Therefore,all metal accumulations in S.sindensis have to be monitored continuously,especially in this region.
基金supported by General Authority for Fish Resources Development(GAFRD),Egypt.
文摘Objective:To estimate the biological and population parameters required for proposing a preparation to sustain and manage this valuable fish resource.Methods:Aging was done by scales reading,and growth was estimated by using the back-calculation method.The values of growth parameters L_(∞),k and t_(o)were calculated by von Bertalanffy model.Results:The results of growth parameters L_(∞),k and t_(o)were 28.36 cm,0.184 per year and-0.8437 per year,respectively.Mortality coefficient,survival and exploitation rates estimated to perceive yield per recruit and biomass per recruit.Conclusions:Biological reference points and virtual population analysis were prepared to plan appropriate managements forSardinella aurita fisheries.
基金Supported by the Department of Biotechnology,Govenment of India[Gran No.(DBT/PR-9230/BLE/08/557/2007)].
文摘Objective:To analyze the quantitative and qualitative properties of the extracted fish oil from Sardinella longiceps(S.longiceps).Methods:Four size groups of S.longiceps were examined for the extraction of fish oil based on length.The size groups included Group I(size range of 7.1-10.0 cm),Group II(size range of 10.1-13.0 cm),Group III(size range of 13.1-16.0 cm)and Group IV(size range of 16.1-19.0 cm).Fish oil was extracted from the tissues of S.longiceps by direct steaming method.The oil was then subjected to the determination of specific gravity,refractive index,moisture content,free fatty acids,iodine value,peroxide value,saponification value and observation of colour.Results:The four groups showed different yield of fish oil that Group IV recorded the highest values of(165.00±1.00)mL/kg followed by Group III[(145.66±1.15)mL/kg]and Group II[(129.33±0.58)mL/kg],whereas Group I recorded the lowest values of(78.33±0.58)mL/kg in monsoon season,and the average yield was(180.0±4.9)mL/kg fish tissues.These analytical values of the crude oil were well within the acceptable standard values for both fresh and stocked samples.Conclusions:The information generated in the present study pertaining to the quantitative and qualitative analysis of fish oil will serve as a reference baseline for entrepreneurs and industrialists in future for the successful commercial production of fish oil by employing oil sardines.
