scholarly journals Age, growth and mortality of poor cod (Trisopterus minutus L.) from the eastern Adriatic Sea

2015 ◽  
Vol 67 (3) ◽  
pp. 921-927 ◽  
Author(s):  
Mate Santic ◽  
Armin Pallaoro ◽  
Ivana Mikulandra ◽  
Biljana Radja ◽  
Ivan Jardas
Keyword(s):  
Adriatic Sea ◽  
Growth Parameters ◽  
Total Sample ◽  
Natural Mortality ◽  
Von Bertalanffy ◽  
Fishing Pressure ◽  
Exploitation Rate ◽  
Slow Growing ◽  
Intensive Growth

The age, growth and mortality parameters for poor cod, Trisopterus minutus, from the eastern Adriatic were analyzed. Samples were collected monthly from January to December 2009 on a random basis, with a total of 1200 specimens analyzed (885 females and 315 males). The values of parameter b (the exponent of the arithmetic form of length-weight relationships) of males (2.97), females (3.01) and total sample (2.99) indicated isometric growth. Fish aged 1-6 years were present in the samples, including a high proportion of 2-year-old individuals. The oldest female was estimated to be 6 years old, while the oldest male was 5. The von Bertalanffy growth parameters were L? = 26.81, K = 0.186, and to = 1.41 for males; L? = 29.5, K = 0.197, and to = 1.33 for females; L? = 28.76, K = 0.194, and to = 1.34 for all specimens. This study revealed that poor cod is a relatively slow-growing fish with intensive growth during the first two years of life. Total and natural mortality were Z = 1.01 year-1 and M = 0.50 year-1, respectively. The exploitation rate, E = 0.50, revealed a high fishing pressure on the stock in the studied area.

scholarly journals Growth, mortality and length-weight relationship of the Bombay duck Harpadon nehereus (Ham. 1822) from North-eastern tip of the Bay of Bengal

2020 ◽  
Vol 32 (1) ◽  
pp. 135-139
Author(s):  
ROKEYA SULTANA ◽  
MD. ABDULLAH AL-MAMUN ◽  
ZOARDER FARUQUE AHMED ◽  
MST KANIZ FATEMA
Keyword(s):  
Growth Parameters ◽  
Natural Mortality ◽  
Von Bertalanffy ◽  
Growth Constant ◽  
North Eastern ◽  
Exploitation Rate ◽  
Bombay Duck ◽  
Relationship Of ◽  
Weight Data ◽  
Harpadon Nehereus

The present study was conducted to investigate the growth parameters, length-weight relationshipand diverse mortality rates of Bombay duck Harpadon nehereus, from North-eastern tip of the Bay of Bengal.The length weight data were collected from January to December 2017 where a total number of 2054individuals of both sex were analyzed. The von Bertalanffy growth parameters, the asymptotic length L?(cm), the growth constant K (year-1) and t0 were estimated as 38.50, 0.88, and -0.0181 years respectively.The growth performance index (Ø?) was found to be 3.115. The total length and body weight (L-W)relationship was found as W=0.004 L3.021, indicating that the growth rate showed a positive allometricpattern (b=3.021>3). The annual fishing morality rate (F) was 1.89, whereas the natural mortality rate (M)was 1.51. The obtained value of the exploitation rate (E= 0.56) indicated that the said population was inover-exploited condition.

scholarly journals Age, growth, mortality, and exploitation rate of blueline snapper, Lutjanus coeruleolineatus (Actinopterygii: Perciformes: Lutjanidae), from Dhofar Governorate, Sultanate of Oman

2021 ◽  
Vol 51 (2) ◽  
pp. 159-166
Author(s):  
Dawood Almamari ◽  
Said Rabia ◽  
Joo Myun Park ◽  
Laith A. Jawad
Keyword(s):  
Fishery Management ◽  
Growth Parameters ◽  
Total Mortality ◽  
Natural Mortality ◽  
Von Bertalanffy ◽  
Fishing Mortality ◽  
Sultanate Of Oman ◽  
Commercial Fish ◽  
Exploitation Rate ◽  
Reported Study

The blueline snapper, Lutjanus coeruleolineatus (Rüppell, 1838), is a significant commercial fish species harvested from the traditional fishery in the Sultanate of Oman. Deficient data on this species, however, make the management strategies challenging, especially in fisheries ecology. A total of 978 specimens were obtained from Dhofar Governorate off the coast of the Arabian Sea during the period between February 2015 and March 2016. In total, 296 sectioned otoliths were analyzed and growth was estimated from non-seasonal growth by using von Bertalanffy method. The parameters of von Bertalanffy growth function, total mortality (Z), natural mortality (M), fishing mortality (F), and exploitation rate (E) were determined and compared with those for Lutjanidae fishes elsewhere. The age structure of male fishes was between 1 and 14 years for males while the age of females ranged from 1 to 18 years. Growth rate (K) was 0.21 y–1 and 0.16 y–1 for males and females, respectively. The hypothetical length of female (L∞ = 46 cm) was relatively higher than that of male (L∞ = 42 cm). The natural mortality (M) was 0.296, total mortality (Z) was 0.372, fishing mortality was 0.076, and exploitation rate (E) was estimated as 0.2. The presently reported study is conducted to examine this fish in relation to growth parameters by analyzing otolith structure. The results of the presently reported study will contribute towards planning the regional fishery management policies in Oman.

scholarly journals PERTUMBUHAN, MORTALITAS DAN TINGKAT PEMANFAATAN KERANG POKEA (Batissa violacea var. celebensis von Martens, 1897) DI SUNGAI LAEYA KONAWE SELATAN PROVINSI SULAWESI TENGGARA

2019 ◽  
Vol 19 (1) ◽  
Author(s):  
Sitti Nurlailah Basri ◽  
Bahtiar Bahtiar ◽  
La Anadi
Keyword(s):  
Growth Analysis ◽  
Total Mortality ◽  
Total Sample ◽  
Natural Mortality ◽  
Von Bertalanffy ◽  
Growth Constant ◽  
Area Method ◽  
Exploitation Rate ◽  
Model Inverse ◽  
Swept Area

Abstract : Pokea clam are one of the potential resources and have an important role both ecologically and economically. One of areas suitable for the life of this clam is the laeya river. This research aimed to determine growth, mortality and eksploitation rate of Pokea clam on the Laeya River in South Konawe which was started in September 2016 – February 2017. This research used swept area method by using a catching tool namely tangge. Data were growth, mortality and the exploitation level was analysed using Bhattacharya method, inverse von Bertalanffy, width converted catch curve and empirical Pauly, accommodated in FiSAT II version 3.0. The total sample of pokea clam during the research were 849 individuals. The result of growth analysis showed that the asymptotic width value (L∞), growth constant (K), estimated value t0 for the growth of pokea clam was 7,41, 0,56 and -0,38. The result of estimation analysis for the level of morality showed that the natural mortality value (M) was 1,84, the catching mortality (F) was 1,19, and the total mortality (Z) was 3,03. The exploitation rate (E) was 0,39 which shows the level exploitation rate of pokea clam in the waters of the Laeya River was still relatively low (under fishing). Keywords : Pokea Clam, Laeya Rivers, Growth, Mortality, Exploitation Rate Abstrak : Kerang pokea merupakan salah satu sumberdaya potensial dan mempunyai peranan penting baik secara ekologis maupun ekonomis. Salah satu wilayah yang cocok untuk kehidupan kerang ini adalah Sungai Laeya. Penelitian ini bertujuan untuk mengetahui pertumbuhan, mortalitas dan tingkat pemanfaatan kerang pokea di Sungai Laeya Konawe Selatan yang dimulai pada bulan September 2016 – Februari 2017. Metode penelitian yang digunakan adalah luas sapuan (swept area method) dengan memakai alat tangkap tangge. Data pertumbuhan, mortalitas dan tingkat eksploitasi masing-masing menggunakan metode Bhattacharya, model inverse von Bertalanffy, hasil tangkapan yang dikonversi dari data lebar cangkang dan empiris Pauly yang terakomodasi dalam program FiSAT II versi 3.0. Total sampel kerang pokea selama penelitian sebesar 849 individu. Hasil analisis pertumbuhan menunjukan nilai lebar asimtotik (L∞), konstanta pertumbuhan (K), nilai dugaan t0 pada pertumbuhan kerang pokea masing-masing 7,41, 0,56, dan -0,38. Hasil analisis pendugaan tingkat mortalitas menunjukkan nilai mortalitas alami (M) 1,84, mortalitas penangkapan (F) 1,19, dan mortalitas total (Z) 3,03. Tingkat eksploitasi (E) yaitu 0,39 yang menunjukkan tingkat eksploitasi kerang pokea di perairan Sungai Laeya masih tergolong rendah (under fishing). Kata Kunci : Kerang Pokea, Sungai Laeya, Pertumbuhan, Mortalitas, Tingkat Eksploitasi

scholarly journals Some biological properties of spiny eel (Mastacembelus mastacembelus, Banks & Solander, 1794) living in the Upper Euphrates River Basin, Turkey

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Mehmet Zülfü Çoban ◽  
Mücahit Eroğlu ◽  
Mustafa Düşükcan
Keyword(s):  
River Basin ◽  
Growth Parameters ◽  
Age Groups ◽  
Mortality Rates ◽  
Biological Properties ◽  
Von Bertalanffy ◽  
Growth Type ◽  
Euphrates River ◽  
Fish Samples ◽  
Exploitation Rate

AbstractThis study was carried out to determine some bioecological characteristics of Mastacembelus mastacembelus, which is the only species of Mastacembelidae family living in Turkey. Fish samples were caught between 2014–2018 from Keban Dam Lake, one of the most important reservoirs of the upper Euphrates Basin. In totally, 348 Mastacembelus mastacembelus individuals were examined, including 178 males and 170 females. The age distributions were defined between the I–XV age groups. Total lengths ranged from 14.20 to 81.80 cm in males and from 15.60 to 77.30 cm in females. Total length–weight relationships were calculated as W = 0.0083 × TL2.6516 for males, W = 0.0043 × TL2.8310 for females and W = 0.0063 × TL2.7256 for all population, and the growth type was estimated as “negative allometric”. The von Bertalanffy growth parameters for all individuals were computed as L∞ = 90.99, k = 0.13, t0 = − 0.45. The total (Z), natural (M), fishing (F) mortality rates and exploitation rate (E) were estimated as Z = 0.313, M = 0.270, F = 0.043 and E = 0.137, respectively. The length at first capture (Lc) was found as 50.72. The optimum, maximum and economic yields were calculated as E0.5 = 0.361; Emax = 0.776; E0.1 = 0.664, respectively.

scholarly journals The Spatial Heterogeneity of the Black Scorpionfish, Scorpaena porcus (Scorpaenidae): Differences in Length, Dietary and Age Compositions

2021 ◽  
Vol 11 (24) ◽  
pp. 11919
Author(s):  
Josipa Ferri ◽  
Sanja Matić-Skoko
Keyword(s):  
High Selectivity ◽  
Adriatic Sea ◽  
Multivariate Analyses ◽  
Growth Parameters ◽  
Island Area ◽  
Intraspecific Variations ◽  
Geographical Scale ◽  
Diet Analyses ◽  
Slow Growing ◽  
Scorpaena Porcus

The present study assessed spatial variations in several biological characteristics of Scorpaena porcus Linnaeus, 1758 and estimated length structure, dietary composition and growth parameters for the species. Sampling was carried out in two areas, about 200 km apart, in the coastal Adriatic Sea, which is the northernmost region of the Mediterranean. A total of 388 specimens of S. porcus were caught, 233 from the Split area and 155 from the Pag Island area, and a higher proportion of individuals in the ≤15 cm length classes were found in the Split area. The results of the age, growth and diet analyses demonstrated that the black scorpionfish is a slow-growing and long-lived species that feeds on a wide variety of plant and animal taxa and shows a high selectivity for crustacean decapods. Detailed comparisons and multivariate analyses showed significant fine-scale spatial structuring of the investigated species, as observed length, dietary and age compositions were heterogeneous among the two areas. Fish from the Pag Island area ingested a greater diversity of the prey types, fed to a greater extent on fishes, reached the highest total length and showed a higher growth rate. Such intraspecific variations could reflect adaptations to different environmental conditions and support the geographical scale at which local black scorpionfish populations should be managed.

scholarly journals POPULATION DYNAMICS OF MALAYAN LEAF FISH (Pristolepisgrooti Blkr.) IN RANAU LAKE, SOUTH SUMATRA

2018 ◽  
Vol 24 (2) ◽  
pp. 125
Author(s):  
Sevi Sawetri ◽  
Subagdja Subagdja ◽  
Dina Muthmainnah
Keyword(s):  
Mortality Rate ◽  
Growth Parameters ◽  
Total Mortality ◽  
Natural Mortality ◽  
Fishing Mortality ◽  
Frequency Data ◽  
Length Frequency ◽  
Lake Ecosystems ◽  
Exploitation Rate ◽  
Length Frequency Data

The Malayan leaf fish or locally named as kepor (Pristolepis grooti) is one of important biotic components in Ranau Lake ecosystems. This study aimed to estimate population dynamic and exploitation rate of kepor in Ranau Lake, South Sumatera. The population parameters are estimated based on length frequency data which were collected in March to October 2013. Growth parameters and fishing mortality rates were calculated using FiSAT software package. The results showed that kepor’s growth was negative allometric, which tended to gain length faster than weight. Kepor population was dominated (42%) by individual length of 10.0 to 11.0 cm. Predicted length infinity (L) was 17.28 cm with high value of growth rates (K) of 1.4 year-1. The natural mortality rate (M) is 2.57 year-1, the fishing mortality rate (F) is 5.36 year-1 and total mortality rate (Z) is 7.93 year-1. The exploitation rate of Malayan leaf fish in Ranau Lake (E = 0.68 year-1) has passed the optimum score.  

Age, growth and mortality of the garfish, Belone belone (L. 1761) in the Adriatic Sea

2012 ◽  
Vol 93 (2) ◽  
pp. 365-372 ◽  
Author(s):  
Barbara Zorica ◽  
Vanja Čikeš Keč
Keyword(s):  
Adriatic Sea ◽  
Growth Parameters ◽  
Fork Length ◽  
Mortality Rates ◽  
Von Bertalanffy ◽  
Positive Allometry ◽  
Von Bertalanffy Model ◽  
Total Length ◽  
Belone Belone ◽  
Conservation And Management

A sample of 3393 garfish, Belone belone (Linnaeus, 1761) was captured using a seine net between January 2003 and December 2008, along the eastern Adriatic Sea. The range in total length was 20.8–75.4 cm and in weight was 12.21–639.25 g. Length–length equations for converting size measurements (standard length and fork length to total length (TL)) were linear. In the length–weight relationship, positive allometry was established (b = 3.4818). Age, determined from sagittal otoliths, ranged from 1+ to 8+ years. The estimated von Bertalanffy model growth parameters for garfish were L∞ = 90.3 cm, K = 0.158 year−1, t0 = −0.109. Otolith weight was endorsed as a possible age predictor, as it showed highly exponential correlation with total garfish length and age (Wo = 0.0012 TL2.189; Wo = 0.568t1.486). These findings were used to examine mortality rates and exploitation in order to improve conservation and management of this pelagic species.

scholarly journals Age, growth and mortality of the European Seabass, (Dicentrarchus Labrax) in Bardawil lagoon, North Sinai, Egypt

2021 ◽  
pp. 042-046
Author(s):  
El-Desoki Menna O ◽  
Younis Younis M ◽  
A Youssef El-Dakar ◽  
Ahmed Salem M ◽  
Ahmed Kassem S ◽  
...  
Keyword(s):  
Growth Parameters ◽  
Age Groups ◽  
Dicentrarchus Labrax ◽  
Mortality Rates ◽  
Von Bertalanffy ◽  
Fishing Mortality ◽  
European Seabass ◽  
Exploitation Rate ◽  
The Relationship ◽  
North Sinai

Age, growth, and mortality of European Seabass (Dicentrarchus labrax) were studied from a small-scaled fishery of Bardawil lagoon, (North Sinai, Egypt). 181 specimens (16.6 to 35 cm total Length and 39.8 to 367.2 g total weight). The relationship between length and weight was W = 0.0054L3.1428. Age was determined by otoliths and age groups I to IV years were observed. Growths in length and weight at the end of each year were calculated. The growth parameters of von Bertalanffy equation were calculated as (L∞ = 48.69 cm, K = 0.1677 yr -1 and t0 = -0.447 yr -1). Growth performance index was calculated (φ = 2.60 for length and 1.25 for weight). Mortality rates were 0.867 yr-1, 0.25 yr1and 0.617 yr-1 for total, natural and fishing mortality, respectively. The currently exploitation rate E = 0.712 yr-1 indicating that, the population of this species is being heavily exploited.

scholarly journals DINAMIKA POPULASI IKAN GABUS (Channa striata) DI RAWA DANAU PANGGANG, KALIMANTAN SELATAN

2018 ◽  
Vol 14 (1) ◽  
pp. 16
Author(s):  
Dini Sofarini ◽  
Mohammad Mahmudi ◽  
Asus Maizar S. Hertika ◽  
Endang Yuli Herawati
Keyword(s):  
Growth Rate ◽  
Mortality Rate ◽  
Population Dynamic ◽  
Growth Pattern ◽  
Total Mortality ◽  
Natural Mortality ◽  
Von Bertalanffy ◽  
Fishery Resource ◽  
Exploitation Rate ◽  
Channa Striata

The province of South Kalimantan has the largest peat swamp that is named Danau Panggang Swamp with an area of 5,390.7 Ha. This swamp has ecological, economic and potential functions of a large fishery resource. The purposes of this study are to evaluate the exploitation rate of Snake Head Fish (Channa striata) in Danau Panggang Swamp, by population dynamic analysis using FISAT program of Von Bertalanffy method.  The results showed that the growth pattern of Snake Head Fish (Channa striata) has the tendency to grow negative allometric with 63.4 cm of long infifer (L¥), growth rate (k) 0.15 per year, theoretical age at the time of the fish is equal to 0 (t0) is -1.48257 years. While the natural mortality rate (M) was 0.43, the mortality rate due to catch (F) of 0.69/year and the total mortality rate  (Z) of 1.12/year, and the rate of exploitation value E = 0.62.  These results indicated that the exploitation rate of Head Snake Fish (Channa striata) in Danau Panggang swamp has a tendency to overfishing.

scholarly journals Analysis Model of Giant Prawns Population (Macrobrachium rosenbergii) in Estuary Edge of Sembakung Waters, Nunukan, Indonesia

2020 ◽  
Vol 12 (2) ◽  
pp. 236
Author(s):  
Agus Indarjo ◽  
Gazali Salim ◽  
Christine Dyta Nugraeni ◽  
Lukman Yudho Prakoso ◽  
Permana Ari Soejarwo ◽  
...  
Keyword(s):  
Sex Ratio ◽  
Growth Pattern ◽  
Growth Characteristic ◽  
Macrobrachium Rosenbergii ◽  
Survey Method ◽  
Natural Mortality ◽  
Von Bertalanffy ◽  
Male Mortality ◽  
Male And Female ◽  
Exploitation Rate

HighlightThe sex ratio of giant prawns in the waters of fe- male groceries is 3 times higher than that of males.The growth characteristic of male and female   giant   prawns   is   negative   allometry, but the male and female body shapes are fat.Total   mortality, capture mortality, catch rate, male prawns are higher than females.The male infinitive growth is longer than the female,but the female’s growth rate is faster than male.AbstractGiant prawns (Macrobrachium rosenbergii) is a crustacean class that has the larg- est size and its habitat in Sembakung waters included brackish water (estuarine) with a salinity variable of 6.5+0.5 ppt and a temperature variable of 28.5+0.5OC and a variable pH of 6 (acidic). The objective of this research was to analyze the growth and mortality model of giant prawns (M. rosenbergii) that was taken from the catch of fisherman in the estuary, Sembakung sub-district, Nunukan Regency, Indonesia. The study was conducted for 3 months from November 2019 to Janu- ary 2020. The sampling was by using a survey method with purposive judgment sampling based on a catch of 14 fishermen who used the bottom fish pot from Sembakung waters, Nunukan Regency (Indonesia). The data collection included data of sex, total length, and the total weight of giant prawns. While analysis was employed for growth pattern, condition index, Von Bertalanffy growth, and mor- tality. The results obtain the sex ratio of male and female giant prawns 1:3.67. The growth pattern of male and female giant prawns were allometric negative. The growth of the von Bertalanffy model for infinitive growth of male giant prawns were 21.219 cm and female were 18.42 cm, respectively the mortality from giant prawns obtain total male mortality is 2,257, catch mortality is 1.92 and natural mortality is 33.75% with an exploitation rate of 0.85 (85%). The total female mor- tality is 1.528, catch mortality is 120.1% and natural mortality is 32.69% with an exploitation rate of 0.786 (78.6%).

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