Estimating Growth Parameters for Pacific Halibut from Mark–Recapture Data

1981 ◽  
Vol 38 (4) ◽  
pp. 394-398 ◽  
Author(s):  
Donald A. McCaughran
Keyword(s):  
Growth Curve ◽  
Growth Parameters ◽  
Fork Length ◽  
Minimum Variance ◽  
Population Parameters ◽  
Pacific Halibut ◽  
Unbiased Estimates ◽  
The Mean ◽  
The Individual ◽  
Growth Estimation

The parameters in the model L(t) = αtβ were estimated for each fish from mark and recapture lengths. The individual estimates of the parameters were combined to give minimum variance unbiased estimates for the population parameters lnα and β. The age-specific lengths of halibut were found to fit a lognormal distribution; hence, the model was fitted to the median of the lengths instead of the mean. The median of the estimator [Formula: see text] is equal to the population median fork length at time t. In this sense the estimator is "median unbiased." As an example of the method, a growth curve is fitted to a group of halibut born between 1961 and 1965 and recaptured in the Yakutat region.Key words: Pacific halibut, growth, estimation

scholarly journals ASPEK BIOLOGI DAN PARAMETER POPULASI UDANG JINGA (Metapenaeus affinis H. Milne Edwards, 1837) DI PERAIRAN KOTABARU, KALIMANTAN SELATAN

2017 ◽  
Vol 9 (1) ◽  
pp. 11
Author(s):  
Tirtadanu Tirtadanu ◽  
Suprapto Suprapto ◽  
Ali Suman
Keyword(s):  
Growth Parameters ◽  
Growth Function ◽  
Fishing Effort ◽  
Population Parameters ◽  
Male And Female ◽  
Management Measures ◽  
Exploitation Rate ◽  
Mean Size ◽  
Biological Aspects ◽  
The Mean

Udang jinga (Metapenaeus affinis H. Milne Edwards, 1837) merupakan salah satu jenis udang ekonomis penting yang diusahakan di perairan Kotabaru dan saat ini produksinya cenderung mengalami penurunan. Salah satu data dan informasi yang diperlukan dalam mengkaji tingkat pemanfaatan dan dasar pengelolaannya adalah aspek biologi dan parameter populasi. Penelitian ini bertujuan mengkaji aspek biologi dan parameter populasi udang jinga sebagai bahan kebijakan pengelolaan perikanan udang di perairan Kotabaru, Kalimantan Selatan. Penelitian dilakukan pada bulan Januari – November 2016 di perairan Kotabaru. Parameter pertumbuhan diestimasi berdasarkan pergeseran modus struktur ukuran panjang dengan metode ELEFAN I. Hasil penelitian menunjukkan rata-rata ukuran udang jinga (M. affinis) betina yang tertangkap adalah 23,6 ± 3,45 mmCL dengan modus ukuran 24 mmCL dan rata-rata ukuran udang jantan adalah 20,7 ± 2,9 mm dengan modus ukuran 18 mmCL. Nisbah kelamin udang jinga jantan dan betina adalah 1 : 2,5. Musim pemijahan udang jinga diduga berlangsung sepanjang tahun dan puncak pada bulan Maret. Ukuran rata-rata pertama kali tertangkap (Lc) udang lebih kecil dari ukuran rata-rata pertama kali matang gonad (Lm) (21,7 < 28,5 mm CL) sehingga sebagian besar udang tertangkap berukuran kecil dan belum memijah. Persamaan pertumbuhan udang jinga jantan  CL(t)=35,95(1-e-2.02(t+0,31) dan udang jinga betina CL(t)= 38,3(1-e-1,92(t+0,29)). Tingkat pemanfaatan udang (E) menunjukkan lebih tangkap (overfishing) yakni 0,70/tahun pada jantan dan 0,73/tahun pada betina. Dengan demikian disarankan untuk melakukan pengurangan upaya penangkapan sebesar 40% dan penutupan musim penangkapan di bulan Maret.The jinga shrimp (Metapenaeus affinis H. Milne Edwards, 1837) was one of important commodity that was exploited in Kotabaru Waters, yet the production tend to be declined recently. The data and information on biological aspects and population parameters are needed to investigate the exploitation level and the basis of management measures. This research aims to investigate the biological aspects and population parameters of jinga shrimp Kotabaru waters, South of Kalimantan. This research was conducted on January – November 2016. The growth parameters were estimated as movement of length frequency mode by ELEFAN I method. The results showed that the mean size of female jinga shrimp (M. affinis) was 23,6 ± 3,45 mm CL and the mode was 24 mmCL. While, the mean size of male jinga shrimp was 20,7 ± 2.9 mm CL and the mode was 18 mmCL. The sex ratio of male and female shrimp was 1 : 2,5 . Spawning season of jinga shrimp was estimated throughout the year and the peak was in March. The length at first captured (Lc) was shorter than length at first matured (Lm) (21,7 < 28,5 mm CL). That means most of the catches was immature. The growth function of male and female jinga shrimp were and, CL(t)=35,95(1-e-2.02(t+0,31) respectively and CL(t)= 38,3(1-e-1,92(t+0,29)). The exploitation rate (E) of male and female shrimp fishing were  0,70/year 0,73/year, respectively. The reduction of fishing effort needed by 40% of the actual combined with the temporal fishing closure March.

A study on some population parameters of mantis shrimp (Squilla mantis L., 1758) in Izmir Bay (Aegean Sea)

2017 ◽  
Vol 98 (4) ◽  
pp. 721-726 ◽  
Author(s):  
Naciye Erdoğan Sağlam ◽  
Yeşim Demir Sağlam ◽  
Cemil Sağlam
Keyword(s):  
Sex Ratio ◽  
Condition Factor ◽  
Growth Parameters ◽  
Age Determination ◽  
Aegean Sea ◽  
Population Parameters ◽  
Age Composition ◽  
Mantis Shrimp ◽  
The Mean ◽  
Length Frequency Data

The population parameters of mantis shrimp (Squilla mantis Linnaeus, 1758) were studied regarding age composition, sex ratio, growth, survival and mortality rates, and the exploitation rate in the Aegean coasts of Turkey in 2013. We collected 936 specimens by shrimp gillnets along the coasts of Izmir Province from April to October 2013. The mean condition factor was K = 1.02 for both sexes, while the sex ratio was 58.7% for female and 41.3% male. Mean lengths, mean weight and length–weight relationship were calculated as TL = 12.57 ± 0.07 cm, CL = 3.02 ± 0.02 cm, W = 22.14 ± 0.37 g, W = 0.0098 × L3.02. Age determination was based on indirect ageing through length–frequency data using the Bhattacharya method. The age of the population varied from 0+ to 3+. Von Bertalanffy growth parameters were estimated as TL∞ = 19.69 cm, CL∞ = 4.74, W∞ = 79.41 g, k = 0.50 year−1 and t0 = −0.37 year. Mortality and exploitation rates derived as Z = 1.90, M = 1.16, F = 0.74 and E = 0.39, respectively.

scholarly journals Some aspects of the biology of Abu mullet Liza abu (Heckel, 1843) in the Orontes River, Turkey

2016 ◽  
Vol 74 (2) ◽  
pp. 49-55 ◽  
Author(s):  
Sezen Ay ◽  
Gülnaz Özcan
Keyword(s):  
Condition Factor ◽  
Growth Parameters ◽  
Fork Length ◽  
Spawning Period ◽  
Female Ratio ◽  
Liza Abu ◽  
The Mean ◽  
Egg Diameter ◽  
Male To Female ◽  
Growth And Reproduction

AbstractThe age, growth and reproduction are described for 411 individuals of abu mullet from the Orontes River in Turkey between May 2011 and April 2012. The overall male to female ratio was 1:1.29. Fork length of all individuals ranged from 2.2 to 18.5 cm and total weight from 1.85 to 66.40 g. Isometric growth was observed for males (b=2.938) and all individuals (b=2.907); positive allometric growth was observed for females (b=3.246). The von Bertalanffy growth parameters based on data from otoliths were L∞ = 19.48 cm, k=0.258 year−1 and t0=−1.738 years for males, L∞ = 20.31 cm, k=0.313 year−1 and t0=−1.432 years for females. The growth performance index (Φ) was found to be 1.99 for males, 2.11 for females and 2.18 for all individuals. The mean condition factor (K) was calculated as 0.792±0.027 for males and 0.835±0.030 for females. Length at maturity was 11.49 cm for males and 11.82 cm for females. The fecundity was 14413±1569 with an egg diameter of 0.44±0.07 mm. Spawning period was between April and August. Abu mullet has acclimated well in the Orontes River and is capable of successful reproduction. Its calculated age and size at maturity was smaller and younger than for other populations.

Length‐Weight Relationship (LWR), Growth estimation and Length at maturity of Eleutheronema tetradactylus in the Chilika Lagoon, India

2012 ◽  
Vol 2 (3) ◽  
pp. 97-102
Author(s):  
S. K. Karna ◽  
D. K. Sahoo ◽  
S. Panda
Keyword(s):  
Growth Parameters ◽  
Fork Length ◽  
Growth Function ◽  
Chilika Lagoon ◽  
Growth Coefficient ◽  
Logistic Equations ◽  
Weight Relationship ◽  
Von Bertalanffy Growth Function ◽  
Growth Estimation ◽  
Future Management

An attempt was made to study the length‐weight relationship (LWR), growth and length at 50% maturity (L50) of Eleuthronema tetradactylus (Sahala) in Chilika lagoon, which will helpful for the future management of the stocks as well as the lagoon. For LWR study, a total of 255 fish specimens collected from April 2008 to May 2009 of which fork length (FL) and body weight (BW) were measured to the nearest 0.1cm and 0.01g respectively. The equation, y = 4E‐06x3.115 found from the study where the computed condition factor (a), growth coefficient (b) and regression coefficient (r2) were 4E‐06, 3.115 and 0.996 respectively. In total, 3356 number of specimen measured to study growth of the species. The estimated growth parameters found from von Bertalanffy Growth Function (VBGF) i.e., Linf(cm), K, and t0 were 78.1cm, 0.15, and ‐0.47 respectively. Logistic equations used to estimate the length at 50% maturity (L50) of a total of 68 specimens, sampled from April 2008 to May 2009. The estimated L50 was 315mmFL.

scholarly journals ASPEK BIOLOGI DAN DINAMIKA POPULASI IKAN LAYANG BIRU (Decapterus macarellus Cuvier, 1833) DI PERAIRAN LAUT SULAWESI

2019 ◽  
Vol 11 (3) ◽  
pp. 137
Author(s):  
Achmad Zamroni ◽  
Adi Kuswoyo ◽  
Umi Chodrijah
Keyword(s):  
Sex Ratio ◽  
Growth Parameters ◽  
Economic Value ◽  
Gonad Index ◽  
Fork Length ◽  
Spawning Season ◽  
Fish Length ◽  
Population Parameters ◽  
Gonad Maturity ◽  
Fish Samples

Ikan layang biru (Decapterus macarellus) merupakan salah satu jenis ikan pelagis kecil yang dominan tertangkap dan mempunyai nilai ekonomi yang tinggi, terutama untuk daerah dengan perairan yang lebih oseanik seperti di perairan Indonesia bagian timur. Tujuan penelitian ini adalah untuk mengidentifikasi parameter populasi ikan layang biru khususnya tertangkap di Laut Sulawesi. Pengambilan sampel ikan untuk diukur panjang cagak dan diamati kematangan gonad dilakukan secara acak setiap bulan. Informasi parameter populasi yang diperoleh dalam penelitian ini adalah hubungan panjang-berat, nisbah kelamin, tingkat kematangan gonad, nilai L50% dan Lm, parameter pertumbuhan serta tingkat pemanfaatan. Hasil penelitian menunjukkan bahwa sebaran ukuran panjang cagak ikan (fork length = FL) berkisar antara 10,25 - 32,25 cm, pola pertumbuhannya bersifat allometrik negatif. Nisbah kelamin ikan layang biru antara jantan : betina tidak berimbang yaitu 1 : 1,963. Ikan layang biru yang tertangkap didominasi oleh ikan dalam kondisi kematangan gonad tingkat III, artinya gonad masih dalam kondisi berkembang. Berdasarkan analisis tingkat kematangan gonad dan nilai indeks gonad dapat diketahui bahwa puncak musim pemijahan ikan terjadi pada bulan Maret. Perbandingan nilai L50% dan Lm diperoleh (L50% > Lm), artinya secara umum ikan telah mengalami matang gonad sebelum ikan tersebut ditangkap. Nilai eksplotasi lebih tinggi dari nilai eksploitasi optimal 0,5 per-tahun. Diduga puncak rekruitmen yang terjadi pada bulan Juni berasal dari musim pemijahan yang terjadi pada bulan Maret.Mackerel scad (Decapterus macarellus) is one of the dominant small pelagic fish species with high economic value, especially for areas with more oceanic waters such as eastern Indonesia. The purpose of this study was to identify the population parameters of the Mackerel scad especially those caught in the Celebes Sea. Fish samples were randomly taken to measure for length measurements and gonad maturity observation every month. Information on population parameters obtained in this study is the length-weight relationship, sex ratio, gonad maturity level, L50% and Lm values, growth parameters, and exploitation rates. The results showed that the distribution of fish length range from 10.25 - 32.25 cm of fork length, with the growth pattern was negative allometric. The sex ratio between males: females was not balanced (1: 1,963). The Mackerel scad caught was dominated by fish in the condition of level III maturity, meaning that each gonad was in a developing condition. Based on the analysis of gonad maturity and gonad index, it can be estimated that the peak of the spawning season occurs in March. A comparison of the values of L50% and Lm obtained was L50% > Lm, meaning that in general, the fish has reached gonad ripening before they were caught. The exploitation rate was higher than the optimal exploitation value of 0.5 per year. It is likely that the peak of recruitment occurred in June came from the spawning season occurred in March.

Biology of peron's threadfin bream, Nemipterus peronii (Valenciennes), from the north west shelf of Australia

1984 ◽  
Vol 35 (2) ◽  
pp. 167 ◽  
Author(s):  
KJ Sainsbury ◽  
AW Whitelaw
Keyword(s):  
Growth Curve ◽  
Sexual Maturity ◽  
Growth Parameters ◽  
Fork Length ◽  
Instantaneous Rate ◽  
Fish Size ◽  
North West ◽  
The North ◽  
Age Range ◽  
Annual Mortality

Samples of N. peronii collected at depths of less than about 100 m showed a slight positive correlation between fish size and depth, but no correlation between abundance and depth and no die1 change in catch rate. Feeding occurred during the day, with crustaceans (Brachyura, Natantia, Mysidacea and Stomatopoda in particular) occurring in 70% of feeding individuals and fish occurring in 17%. Individuals containing ripe eggs were found throughout the year, although the proportion of ripe fish was highest in November and December. Sexual maturity in 50% of females was attained at a fork length of about 15 cm and at an age of 1 year. Zonation on the otoliths was shown to be annual and estimates of the parameters of the von Bertalanfi growth curve were L∞ = 41.9 cm, K= 0.25, t0 = 0.74 years over the age range 0.5-5 years. The growth parameters for sexually differentiated animals differed significantly, but the age-length trajectory of each was very similar over the observed age range. The instantaneous rate of total annual mortality was 1.85 and did not differ between sexes.

scholarly journals DINAMICA POBLACIONAL DEL CHIVO MAPALE Cathorops spixii EN LA CIENAGA GRANDE DE SANTA MARTA Y COMPLEJO PAJARALES, CARIBE COLOMBIANO

2016 ◽  
Vol 27 ◽  
Author(s):  
Rocío Tíjaro ◽  
Mario Rueda ◽  
Adriana Santos Martínez
Keyword(s):  
Growth Parameters ◽  
Estuarine System ◽  
Von Bertalanffy ◽  
Population Parameters ◽  
Commercial Catch ◽  
Cycle Growth ◽  
Exploitation Rate ◽  
Mean Size ◽  
The Mean ◽  
Catch Statistics

During 1994, the catfish "chivo mapalé" (Cathorops spixii) was the second most abundant fishing resource in the "Ciénaga Grande de Santa Marta" and the "Complejo de Pajarales", the main lacustrine-estuarine system of Colombia. Using commercial catch statistics and fishing explorations, the population parameters were determined reproductive cycle, growth, mortality, yield and biomass per recruit. Mature individuals were present all year around with peaks of ripeness and spawning from June to August during periods of little rain and dry, respectively. The mean maturity size was estimated at 23 cm. The growth parameters of the Von Bertalanffy function were: Loo = 32.5 cm and K = 0.38 year1, with a growth performance index of 2.6. Total (Z), natural (M) and fishing (F) mortality rates were estimated as 2.83, 0.96 and 1.87 year1, respectively. The exploitation rate E = 0.66 indicates that the resource is overfished. Therefore it is recomended a fishery regulation by decreasing the mortality rate to F = 1.0 year1 and increasing the cath mean size to 23 cm.

Age determination and growth estimation from otolith micro-increments and fin spine sections of blue marlin (Makaira nigricans) in the western North Pacific

2015 ◽  
Vol 66 (12) ◽  
pp. 1116 ◽  
Author(s):  
Tamaki Shimose ◽  
Kotaro Yokawa ◽  
Katsunori Tachihara
Keyword(s):  
Growth Parameters ◽  
Age Determination ◽  
Fork Length ◽  
Annual Growth ◽  
Growth Band ◽  
Blue Marlin ◽  
Makaira Nigricans ◽  
Growth Bands ◽  
Growth Estimation ◽  
Fin Spines

Age determination and growth estimation of blue marlin (Makaira nigricans) were performed by combining method of otolith micro-increment counts of 27 young (17–185-cm lower jaw–fork length, LJFL) and sectioned dorsal fin spines of 571 adult individuals (155–352cm). Otolith micro-increments were counted with ages of 26–338 days old. The estimated mean length (185cm) at Year 1 and growth rate were used to predict the position of the first annual growth band in sectioned fin spines. Distinct growth bands were formed in fin spines annually between September and October. Indistinct growth bands were considered false-annual growth bands. The observed and back-calculated LJFLs at each age were highly variable for both sexes. Von Bertalanffy growth parameters were estimated using mean back-calculated LJFL data as: L∞=295cm, k=0.23, t0=–3.31 years for females and 212cm, 0.29, –4.49 years for males. Females grew to >200cm in 2 years and to >250cm in 5 years on average, whereas the growth of males slowed appreciably after they reached the age of 1 year. This is the first study of blue marlin growth for entire life stages.

scholarly journals PARAMETER POPULASI DAN POLA REKRUITMEN IKAN TONGKOL LISONG (Auxis rochei Risso, 1810) DI PERAIRAN BARAT SUMATERA

2015 ◽  
Vol 7 (3) ◽  
pp. 129
Author(s):  
Tegoeh Noegroho ◽  
Umi Chodrijah
Keyword(s):  
Mortality Rate ◽  
Frequency Analysis ◽  
Growth Parameters ◽  
Fork Length ◽  
Total Mortality ◽  
Von Bertalanffy ◽  
Population Parameters ◽  
Length Frequency ◽  
Exploitation Rate ◽  
Length Frequency Analysis

Perikanan neritik tuna di perairan Barat Sumatera berkembang pesat beberapa dekade terakhir ini. Sementara belum banyak diperoleh hasil penelitian tentang populasi ikan tongkol lisong (Auxis rochei). Penelitian tentang parameter populasi dan pola rekruitmen ikan tongkol lisong dilakukan pada bulan Februari-Desember 2013 di beberapa lokasi pendaratan ikan di Barat Sumatera. Tujuan penelitian ini adalah untuk memperoleh laju pertumbuhan, panjang asimptotik, laju kematian, laju eksploitasi, dan pola rekruitmen ikan tongkol lisong (Auxis rochei). Estimasi parameter populasi menggunakan model analitik berdasarkan program “Electronic Length Frequency Analysis (ELEFAN 1)”. Data frekuensi panjang dikumpulkan berkesinambungan di beberapa tempat pendaratan utama. Hasil penelitian menunjukkan panjang cagak ikan tongkol lisong yang tertangkap berada pada kisaran 11-42 cmFL. Parameter pertumbuhan Von Bertalanffy diperoleh nilai laju pertumbuhan (K) sebesar 0,54/tahun, panjang asimptotik (L ) sebesar 43,5 cm FL, dan umur ikan pada saat panjang ke-0 (-t0) sebesar -0,076/tahun. Laju mortalitas total (Z) sebesar 1,96/tahun. Laju kematian karena penangkapan (F) sebesar ,07/tahun, dan laju kematian alami (M) 0,89/tahun. Laju eksploitasi (E) tongkol lisong di Barat Sumatera adalah 0,49/tahun atau berada pada tingkat eksploitasi moderat. Pola rekrutmen tongkol lisong terjadi dua kali dalam setahunnya, yaitu mencapai puncak pada bulan Maret dan Juni.Neritic tuna fishery in theWest Sumatra waters was developed very intensively in the captured.Meanwhile, study population of bullet tuna (Auxis rochei) in those are still limited. Research in population parameters and recruitmen pattern of bullet tuna has been conducted in February-December 2013 based on several landing place inWest Sumatra. The aim of this study is to obtain asymptotic length, mortality rate, exploitation rate, and recruitment pattern of bullet tuna (Auxis rochei). Estimation of population parameters using an analytical model based on the program “Electronic Length Frequency Analysis (ELEFAN 1)”. Length frequency data collected continuously in themain landing places The results showed the fork length of bullet tuna was caught in the range 11-42 cm FL. Von Bertalanffy growth parameters obtained the growth rate value (K) of 0,54/year, asymptotic length (L ) of 43,5 cm FL, and fish age when the length to the-0 (-t0) of -0,076/year. Total mortality was 1,96/year. Fishing mortality rate (F) was 1,07/year and natural mortality rate (M) 0,89/year. The exploitation rate (E) of bullet tiuna in West Sumatra was 0,49 / year or are at a moderate level of exploitation. Recruitment patterns of bullet tuna happen twice in a year, which reached a peak in March and June.

Effect of individual variability on estimation of population parameters from length-frequency data

1998 ◽  
Vol 55 (11) ◽  
pp. 2393-2401 ◽  
Author(s):  
You-Gan Wang ◽  
Nick Ellis
Keyword(s):  
Growth Parameters ◽  
Growth Parameter ◽  
Individual Variability ◽  
Fish Stock ◽  
Frequency Data ◽  
Population Parameters ◽  
Length Frequency ◽  
The Moment ◽  
The Individual ◽  
Length Frequency Data

We consider estimation of mortality rates and growth parameters from length-frequency data of a fish stock when there is individual variability in the von Bertalanffy growth parameter Linfinity and investigate the possible bias in the estimates when the individual variability is ignored. Three methods are examined: (i) the regression method based on the Beverton and Holt's (1956, Rapp. P.V. Reun. Cons. Int. Explor. Mer, 140: 67-83) equation; (ii) the moment method of Powell (1979, Rapp. P.V. Reun. Int. Explor. Mer, 175: 167-169); and (iii) a generalization of Powell's method that estimates the individual variability to be incorporated into the estimation. It is found that the biases in the estimates from the existing methods are, in general, substantial, even when individual variability in growth is small and recruitment is uniform, and the generalized method performs better in terms of bias but is subject to a larger variation. There is a need to develop robust and flexible methods to deal with individual variability in the analysis of length-frequency data.

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