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  • 1
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    Empirical use of growth, mortality and temperature data for anchovy (2021)
    In:  pjms_ku@yahoo.com | http://aquaticcommons.org/id/eprint/27098 | 25017 | 2020-11-12 05:04:53 | 27098 | University of Karachi. Marine Reference Collection and Resource Centre
    Details
    Publication Date: 2021-07-24
    Description: To estimate the empirical relationships in anchovy, the instantaneous natural mortality rate (M) calculated from von Bertalanffy Growth Function (VBGF) parameters, maximum total length (Lmax) and sea surface temperature (T,°C) were reviewed in the Black Sea. Empirical equations were presented for evaluation of M data in their relationships to VBGF parameters, T and Lmax. Based on biological consideration and regressional definition, it was recommended to use following formulas for estimating of natural mortality rate of small pelagic fish such as anchovy. M = 0.3237 + 1.3174*(K) - 0.0036*(L∞) - 0.0117*(T); M = 0.2639 + 1.3676*(K) - 0.0003*(Lmax) - 0.0124*(T).
    Description: Higher Education Commission of Pakistan
    Keywords: Biology ; fisheries management ; population dynamics ; small pelagic fish ; Black Sea
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 127-135
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  • 2
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    Seasonal variation of condition factor and weight - length relationship in Thryssa hamiltonii Gray, 1835 (Clupeiformes: Engraulidae) collected from Balochistan coast in the Arabian Sea, Pakistan (2021)
    In:  pjms_ku@yahoo.com | http://aquaticcommons.org/id/eprint/26568 | 25017 | 2019-05-31 14:04:31 | 26568 | University of Karachi. Marine Reference Collection and Resource Centre
    Details
    Publication Date: 2021-07-24
    Description: Present study deals with the effects of seasonal variation on condition factor (CF) and weight - length relationships (WLRs) of Thryssa hamiltonii, sampled during pre and post- monsoon seasons in 2011 from the Balochistan coast of the Arabian Sea. The results showed that T. hamiltonii has isometric growth characteristics in pre and post-monsoon. The value of b was calculated as 3.2364 in pre-monsoon, as 3.0499 in post-monsoon season and as 3.1346 in combined data with not significantly different from 3 (Pauly’ t test, P 〉 0.05) Moreover, the mean CF was calculated between 0.13 - 0.60 (mean: 0.26±0.010) in pre-monsoon season and between 0.19 - 0.90 (mean: 0.39±0.017) in post-monsoon season. The calculated CF showed statistically difference among the pre-monsoon, post-monsoon and combined data (One way ANOVA, P = 5.47E-08).
    Keywords: Biology ; Fisheries ; Length - weight relationships ; condition factors ; Hamilton's thryssa ; Thryssa hamiltonii ; Balochistan coast ; Arabian Sea.
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 29-35
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  • 3
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    Effects of seasons on condition factor and weight - length relationship in Dussumier's halfbeak, Hyporhamphus dussumieri (Valenciennes, 1847), (Actinopterygii: Beloniformes: Hemiramphidae) from Karachi coast in the Arabian Sea (2021)
    In:  pjms_ku@yahoo.com | http://aquaticcommons.org/id/eprint/26572 | 25017 | 2019-05-31 14:16:49 | 26572 | University of Karachi. Marine Reference Collection and Resource Centre
    Details
    Publication Date: 2021-07-24
    Description: A total of (n=114) H. dussumieri were collected during monsoon (August and September), post monsoon (October and November) seasons in 2011. Mean total length of females (t test: P = 2.5663E-12) and males (t test: P = 1.4766E-08) between two seasons were significantly different. Similarly, mean total length (t test: P = 9.8887E-20) and Size-frequency distribution (Kolmogorov-Smirnov two sample test: d = 0.82716, P = 3.41312E-15) were significantly different between monsoon and postmonsoon for combined sexes. The slope (b) of WLRs regression lines for monsoon except for male were significantly different from the isometric growth curve slope (b = 3). Therefore, the slope of WLRs regression lines for postmonsoon by combined sex and both female and male were significantly lower than the isometric growth curve slope (b = 3) suggesting negative allomnetric growth in post-monsoon season.
    Keywords: Biology ; Fisheries ; Hyporhamphus dussumieri ; Length weight relationships ; Karachi fish harbour ; Pakistan.
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 5-13
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  • 4
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    Seasonal changes in condition factor and weight-length relationship of tiger perch, Terapon jarbua (Forsskål, 1775) (Family-Terapontidae) collected from Korangi Fish Harbour, Karachi, Pakistan (2021)
    In:  pjms_ku@yahoo.com | http://aquaticcommons.org/id/eprint/26589 | 25017 | 2019-06-03 11:52:00 | 26589 | University of Karachi. Marine Reference Collection and Resource Centre
    Details
    Publication Date: 2021-07-24
    Description: The present study was conducted to determine the effect of seasonalvariation on condition factors (CFs) and weight - length relationships (WLRs) of TigerPerch, Terapon jarbua (Forsskål, 1775) collected from landing centre at Korangi fishharbour during January to December 2014. A total of 224 specimens were collectedduring different seasons such as pre-monsoon, monsoon and post-monsoon seasons. Theresults showed that T. jarbua has negative allometric growth characteristics in premonsoon,positive allometric growth in monsoon, and isometric growth character in postmonsoonseason (Pauly’ t test, P 〉 0.05). The values of r are different from zero (P 〈0.05), indicated that T. jarbua has higher correlation in WLRs equations. Moreover, tocompare the results calculated from the present study with previous studies, log a valueswere plotted against values of b, which proved to be consistent with previous studies datafor T. jarbua. CFs for T. jarbua was estimated to be the highest value in pre-monsoon(mean: 2.6994±0.0649), followed by post-monsoon (mean: 0.7875±0.0139) and monsoon(mean: 0.4903±0.0105) season. One way ANOVA test showed that seasonal significantdifferences were found in condition factor of T. jarbua at P 〈 0.05.
    Keywords: Biology ; Seasonal changes ; Length - weight relationships (WLRs) ; condition factors (CF) ; T. jarbua ; Korangi Fish Harbour ; Karachi ; Pakistan.
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 19-28
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  • 5
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    Empirical use of growth, mortality and temperature data for anchovy. (2021)
    Details
    Publication Date: 2021-06-29
    Description: To estimate the empirical relationships in anchovy, the instantaneous natural mortality ‎rate (M) calculated from von Bertalanffy Growth Function (VBGF) parameters, ‎maximum total length (Lmax) and sea surface temperature (T,°C) were reviewed in the ‎Black Sea. Empirical equations were presented for evaluation of M data in their ‎relationships to VBGF parameters, T and Lmax. Based on biological consideration and ‎regressional definition, it was recommended to use following formulas for estimating of ‎natural mortality rate of small pelagic fish such as anchovy. M = 0.3237 + 1.3174*(K) - ‎‎0.0036*(L∞) - 0.0117*(T); M = 0.2639 + 1.3676*(K) - 0.0003*(Lmax) - 0.0124*(T).‎
    Description: Published
    Description: Refereed
    Keywords: fisheries management ; population dynamics ; small pelagic fish ; Black Sea ; ASFA_2015::F::Fisheries management ; ASFA_2015::B::Biology ; ASFA_2015::G::Growth rate ; ASFA_2015::A::Animal growth ; ASFA_2015::G::Growth ; ASFA_2015::T::Temperature effects ; ASFA_2015::M::Mortality rate
    Repository Name: AquaDocs
    Type: Journal Contribution
    Format: 127-135
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  • 6
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    Sexual seasonal growth and mortality of Scaldback, Arnoglossus kessleri Schmidt, 1915 (Pleuronectiformes: Bothidae), caught by experimental beam trawl in the Black Sea, Turkiye (2024)
    Details
    Publication Date: 2024-01-11
    Description: The scaldback, Arnoglossus kessleri, is a small fish that belongs to the Bothidae family and its biology is unknown in the Mediterranean Sea including Aegean Sea, Black Sea and Sea of Marmara. To describe first information on the seasonal von Bertalanffy growth function parameters (SVBGF) using length frequency data for A. kessleri, and also to present first information on indirect methods to estimate natural (M) and total mortality rates (Z), a total of 12 months samplings were conducted between December 2012 and November 2013 in the south-east Black Sea. The overall sex ratio of females: males skewed towards males (χ2, P 〈 0.01). The SVBGF parameters, computed from monthly length frequency distribution analysis (LFDA), were estimated as L∞ = 8.25 cm total length (TL), K = 0. 549 year-1 for females and as L∞ = 8.44 cm TL, K = 0.490 year-1 for males. The seasonal oscillation in growth rate for females (C = 0.340) was larger than it was for males (C = 0.260). The slowest period of growth corresponded to December both females and males. The seasonal growth of the scaldback was most probably initiated by photoperiod and accelerated with decreasing water temperatures. Total instantaneous mortality rate, Z, was estimated as 0.853 yr-1 for females and 0.774 yr-1 for males. Instantaneous natural mortality ratio, M, was estimated a bit higher for females (M = 0.714±0.129) than for males (M = 0.655±0.098). The exploitation rate, E, of both sexes was also lower than the optimum exploitation (E = 0.5) criterion, which is indicative of non-exploited and/or lightly exploited of A. kessleri population. The results of this study were offered as biological input parameters for management of Black Sea stocks of the scaldback species.
    Description: Published
    Description: Refereed
    Keywords: Scaldback ; Arnoglossus kessleri ; seasonal growth ; mortality ; fisheries management ; ASFA_2015::M::Marine Biology ; ASFA_2015::M::Mortality ; ASFA_2015::F::Fisheries management ; ASFA_2015::S::Sexual maturity ; ASFA_2015::G::Growth rate ; ASFA_2015::S::Seasonal variations ; ASFA_2015::B::Beam trawlers ; ASFA_2015::L::Length frequency ; ASFA_2015::P::Population density
    Repository Name: AquaDocs
    Type: Journal Contribution
    Format: 113-128
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