Application of a parametric survival model to understand capture-related mortality and predation of yellowfin tuna (Thunnus albacares) released in a recreational fishery

Distinguishing the cause and magnitude of capture-related mortality (CRM) in fishes is important for effective management. To better understand CRM in yellowfin tuna (Thunnus albacares) released in the recreational troll fishery off the United States east coast, 48 fish (76–127 cm curved fork length, CFL) were monitored for up to 86 days postrelease with survivorship pop-up satellite archival tags. Recovered data indicated 40 fish were alive at the time of tag detachment and eight died, including six from predation, from 0 to 30 days postrelease. Survival model variants were constructed to independently estimate the rates of immediate capture and handling (CH), postrelease (PR), total CRM (CH + PR), and natural mortality (M) for small (≤103 cm CFL) and large (>103 cm CFL) fish under different hypotheses and causes of mortality. CH was low (0%–8%) for both size classes but predation was an important component of PR, particularly in the small size class. Total CRM was 51% (95% CI: 26%, 81%) for small and 8% (95% CI: 2%, 30%) for large fish.

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Comparison of the flexible parametric survival model and Cox model in estimating Markov transition probabilities using real-world data

PLoS ONE ◽

10.1371/journal.pone.0200807 ◽

2018 ◽

Vol 13 (8) ◽

pp. e0200807 ◽

Cited By ~ 3

Author(s):

Xudong Du ◽

Mier Li ◽

Ping Zhu ◽

Ju Wang ◽

Lisha Hou ◽

...

Keyword(s):

Real World ◽

Transition Probabilities ◽

Cox Model ◽

Survival Model ◽

Real World Data ◽

World Data ◽

Markov Transition ◽

Parametric Survival Model ◽

Parametric Survival

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Some Tests Based on Extreme Values for a Parametric Survival Model

Journal of the Royal Statistical Society Series B (Methodological) ◽

10.1111/j.2517-6161.1996.tb02090.x ◽

1996 ◽

Vol 58 (2) ◽

pp. 417-424

Author(s):

Martin Crowder

Keyword(s):

Extreme Values ◽

Survival Model ◽

Parametric Survival Model ◽

Parametric Survival

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Size composition and length-weight relationships of the Yellowfin Tuna (Thunnus albacares) in Bone Bay

E3S Web of Conferences ◽

10.1051/e3sconf/202015301006 ◽

2020 ◽

Vol 153 ◽

pp. 01006

Author(s):

Jalil ◽

Achmar Mallawa ◽

Faisal Amir ◽

Safruddin

Keyword(s):

Growth Pattern ◽

Condition Factor ◽

Average Length ◽

Fork Length ◽

Size Composition ◽

Yellowfin Tuna ◽

Thunnus Albacares ◽

Weight Measurement ◽

Weight Relationship ◽

The Relationship

The size composition, length-weight relationship, and condition factor of Thunnus albacares were examined in Bone Bay. Sampling was conducted at two stations, i.e., Station I at Cimpu in Luwu Regency and Station II at Lonrae in Bone Regency between July 2018 and June 2019. 10246 and 2651 yellowfin tunas were captured in Station I and Station II, respectively. Measurement of the fork length ranged between 20 cm and 192 cm with an average length of 81,257 ± 33,456 cm in Station I, and between 26 to 162 cm with an average length of 95,479 cm in Station II. The weight measurement ranged between 0,35 and 99,21 kg with an average of 14,539 kg in Station I, and between 0,46 and 97,35 kg with an average of 26,978 kg in Station II. Calculation of the relationship was based on the formula W= 5,5−5FL2,7454 (R2 = 0,963) in Station I, and W=4,1−5FL2,9103 (R2 = 0,761) in Station II. The values of condition factor at Station I and Station II were 2,1395 and 3,4374, respectively. It is quite evident that the growth pattern of the yellowfin tunas at Bone Bay was negatively allometric, indicating that the length increased faster than the weight.

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Predictors of Independent Living Activities in Elderly People Aged 90 Years and Older Living in Northern Okinawa, Japan, Using A Multi-Level Mixed-Effects Parametric Survival Model

Archives of Physical Medicine and Rehabilitation ◽

10.1016/j.apmr.2020.09.279 ◽

2020 ◽

Vol 101 (11) ◽

pp. e92

Author(s):

Akira Kimura

Keyword(s):

Elderly People ◽

Independent Living ◽

Mixed Effects ◽

Survival Model ◽

Parametric Survival Model ◽

Multi Level ◽

Parametric Survival

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Hubungan Panjang - Berat, Faktor Kondisi dan Ukuran Pertama Kali Tertangkap Ikan Tuna Sirip Kuning (Thunnus Albacares) di Pelabuhan Perikanan Samudra Cilacap Length - Weight Relationship, Condition Factors and Legth of The First Time Caught of Yellowfin Tuna (Thunnus albacares) in Cilacap Ocean Fishing Port

Management of Aquatic Resources Journal (MAQUARES) ◽

10.14710/marj.v9i2.27764 ◽

2020 ◽

Vol 9 (2) ◽

pp. 90-96

Author(s):

Nurul Amin Azizi ◽

Suradi Wijaya Saputra ◽

Abdul Ghofar

Keyword(s):

Sampling Method ◽

Condition Factor ◽

Size Structure ◽

Fork Length ◽

Yellowfin Tuna ◽

Thunnus Albacares ◽

Weight Relationship ◽

Measurement Results ◽

The Indian Ocean ◽

First Time

ABSTRAK Ikan Tuna Sirip Kuning (Thunnus albacares) yang ditangkap di Samudera Hindia merupakan komoditas penting karena memiliki nilai manfaat dan ekonomis yang tinggi. Berdasarkan hal tersebut, perlu dilakukan penelitian mengenai parameter yang mempengaruhi populasi tuna sirip kuning. Penelitian ini bertujuan untuk mengetahui struktur ukuran, hubungan panjang dan berat, faktor kondisi serta ukuran pertama kali tertangkap. Penelitian ini dilakukan pada bulan Juli-Agustus 2019 di Pelabuhan Perikanan Samudera Cilacap. Jumlah sampel tuna sirip kuning sebanyak 267 ekor dari 27 kapal yang melakukan bongkar di lokasi penelitian. Metode pengambilan sampel adalah dengan mengukur panjang dan berat. Hasil pengukuran yang diperoleh kemudian dilakukan analisis statistik dengan melakukan perhitungan dan hipotesis. Sampel ikan yang digunakan dalam penelitian ini yaitu ikan tuna sirip kuning dengan ukuran >0,5 meter dan berat >15 kilogram. Sampel kapal merupakan kapal tuna longline dengan ukuran >10 GT (Gross Tonage). Hasil penelitian didapatkan ukuran panjang antara 88-174 cmFL (panjang cagak) dan berat antara 17-98 kilogram. Hubungan panjang dan berat bersifat allometrik negatif. Faktor kondisi diperoleh sebesar 0,97-1,25. Ukuran pertama kali tertangkap (Lc) sebesar 140 cmFL. Lc>Lm, menunjukan ikan tuna sirip kuning yang tertangkap sudah pernah memijah dan diperbolehkan ditangkap. ABSTRACT Yellowfin Tuna (Thunnus albacares) caught in the Indian Ocean is an important commodity because it has high economic and benefits. Based on this, research needs to be done on the parameters that affect yellow fin tuna population. This study aims to determine the size structure, length and weight relationship, condition factors and the leght of the first time caught. This research was conducted in July-August 2019 at the Cilacap Ocean Fishing Port. The number of yellowfin tuna samples was 267 from 27 ships unloading at the study site. The sampling method is by measuring length and weight. The measurement results obtained are then carried out statistical analysis by doing calculations and hypotheses. Yellow fin tuna samples>> 0.5 meters in size and> 15 kilograms in weight. The sample ship is a longline tuna ship with size> 10 GT (Gross Tonage). The results showed a length of between 88-174 cmFL (fork length) and a weight of 17-98 kilograms. The length and weight relationship is negative allometric. The condition factor is obtained from 0.97 to 1.25. Length of first catch (Lc) was 140 cmFL. Lc> Lm, indicating that yellowfin tuna caught have spawned and are allowed to be caught.

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Evaluation of factors related to the survival of hospitalized patients with COVID-19: Survival analysis with frailty approach

Disaster Medicine and Public Health Preparedness ◽

10.1017/dmp.2021.260 ◽

2021 ◽

pp. 1-16

Author(s):

Parvin Sarbakhsh ◽

Saba Ghaffary ◽

Elnaz Shaseb

Keyword(s):

Unobserved Heterogeneity ◽

Multivariable Analysis ◽

Complete Recovery ◽

Important Variable ◽

Hospitalized Patients ◽

Survival Model ◽

P Value ◽

Factors Affecting ◽

Parametric Survival Model ◽

Parametric Survival

Abstract Introduction: Considering that covid-19 is an emerging disease and results in very different outcomes-from complete recovery to death, it is important to determine the factors affecting the survival of patients. Given the lack of knowledge about effective factors and the existence of differences in the outcome of individuals with similar values of the observed covariates, this study aimed to investigate the factors affecting the survival of patients with COVID-19 by the parametric survival model with the frailty approach. Methods: The data of 139 patients with COVID-19 hospitalized in Imam Reza Hospital in Tabriz were analyzed by the Gompertz survival model with gamma frailty effect. At first, variables with p-value<.1 in univariable analysis were included in the multivariable analysis, and then the stepwise method was used for variable selection. Results: Diabetes mellitus (p-value =.021) was significantly related to the survival of hospitalized patients. The rest of the investigated variables were not significant. The frailty effect was significant (p-value=.019). Conclusion: In the investigated sample of patients with covid19, diabetes was an important variable related to patient survival. Also, the significant frailty effect indicates the existence of unobserved heterogeneity that cause individuals with a similar value of the observed covariates to have different survival distributions.

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Analysis of sizes and state of ovarian maturity in yellowfin tuna (Thunnus albacares) captured in the Gulf of Mexico

International Journal for Innovation Education and Research ◽

10.31686/ijier.vol9.iss10.3439 ◽

2021 ◽

Vol 9 (10) ◽

pp. 214-227

Author(s):

Eduardo Alfredo Zarza Meza ◽

Fabiola Garcés Díaz ◽

Rodrigo Cuervo Gonzalez

Keyword(s):

Gulf Of Mexico ◽

Fork Length ◽

Yellowfin Tuna ◽

Production Costs ◽

Maturity Stage ◽

Thunnus Albacares ◽

Progressive Development ◽

The Pacific ◽

Tuna Fishing ◽

Ovarian Maturity

The yellowfin tuna Thunnus albacares is the second most important fishery in Mexico, due to its production costs and commercial value” The species is fished on both coast of the country, with the Pacific Ocean presenting productions lightly higher than that of the Gulf of Mexico where, in spite of the above statement, tuna catches have recently shown a downward trend. For this reason, analysis is required of the size and stage of ovarian maturity and it is necessary to determine whether capture size is the primary reason behind the decline in the yellowfin tuna fishery Three tuna fishing trips were conducted in the Gulf of Mexico in order to gather data pertaining to fork length (Lf) and gonads Histological sections were obtained from the latter for analysis and determination of maturity stage. The results showed that males were predominant (40%) among the individuals for which the sex could be differentiated in the catches of T. albacares. The Lf values in the catch, were between 75 and 162 cm. However, variations in this parameter were found between sexes. The relationship between length and weight showed that the males are larger than the females, however, the equationgiven by the parameters of a=0.9406 and b= 3.4504, demonstrated growth of positive allometric type in both sexes. There was progressive development in the state of ovarian maturity over the months of capture. Chromatin nuclear (CN) was the most frequent phase within primary ovarian development (November, February, March), stages were present, although these did not present a direct relationship to fork length.

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