Overview of Length-Weight Relationship, Condition Factor and Size at First Maturity of Nile tilapia Oreochromis niloticus (L.) in Different Water Bodies of Ethiopia: A Review

Tesfahun, Agumassie

doi:10.15580/gjbs.2018.3.060618077

Cited by 13 publications

(19 citation statements)

References 20 publications

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“…This phenomenon is locally known as "tubo belerang" and might cause the lake categorized as a poor-nutrient lake, as reported by Edyanto (2006). Tesfahun (2018) stated the size at first maturity of O. niloticus was correlated with availability of food, feeding rate, gonad development, spawning period, water quality parameters can determine the growth rate and the condition of fish and therefore, proper management of this fish stock for sustainable fishery is critical. Lagler et al (1977) stated that external factors like temperature and water current and internal factors such as type of species, age, size, and physiological characteristics, are positively related to the reproduction capacity.…”

Section: Discussionmentioning

confidence: 99%

Stock status of Nile tilapia (Oreochromis niloticus) in Aneuk Laot Lake, Sabang District, Aceh Province, Indonesia

2021

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Abstract. Prianto E, Purwoko RM, Kasim K. 2021. Stock status of Nile tilapia (Oreochromis niloticus) in Aneuk Laot Lake, Sabang District, Aceh Province, Indonesia. Biodiversitas 22: 3364-3370. The Nile tilapia (Oreochromis niloticus) fishery in Aneuk Laot Lake plays a vital role in the local livelihoods. There is an indication of the massive exploitation of the species that potentially harm the stock and threaten its sustainability. This research aims to evaluate and assess the Nile Tilapia's stock status and use the results as baseline information to the management authorities. Surveys were conducted from May 2018 to April 2019 by collecting the length-weight data, sex, and gonadal maturity stage of 600 individuals. The Length-Based Spawning Potential Ratio (LB-SPR) was used to determine the Spawning Potential Ratio (SPR) and compared the results to the reference point. The results show that 50% of the females have matured at 15.1 cm, while the males at 17.8 cm. The individual fish length varies from 12.15 to 20.5 cm, whereas 50% of them were caught at size 17.8 cm (Lc50), meaning that predominantly of the fish had experienced first spawning before they were captured. The current SPR is about 5%, confirming the Nile tilapia's stock status is at an unhealthy state. Consequently, the precautionary approach, such as increasing the mesh size and limiting effort, should be considered to ensure the sustainability of the recruitment.

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Section: Discussionmentioning

confidence: 99%

Stock status of Nile tilapia (Oreochromis niloticus) in Aneuk Laot Lake, Sabang District, Aceh Province, Indonesia

2021

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“…Size at first maturity is commonly evaluated for wild populations as a point of biological reference to ensure that a sufficient number of juveniles reaches maturity (Roa et al, 1999) because only fishing the individuals which have reached maturity is one of the basic rules that should be followed to ensure sustainability (Ilkyaz et al, 2018). It has been utilized in various exploited animals, such as crustaceans (Peixoto et al, 2018), fish populations (Tesfahun, 2018), and mollusks (Galimany et al, 2015), to protect juveniles, let them grow into adults, and spawn at least once before being caught. Proper estimation of size at first maturity is very useful for fish stock management (Karna & Panda, 2011).…”

Section: Fisheries and Aquatic Sciencesmentioning

confidence: 99%

Estimation of first maturity size of dolphinfish Coryphaena hippurus Linnaeus in the Molucca Sea, North Sulawesi, Indonesia

Pratasik¹,

Tilaar²,

Salaki³

2022

Fish Aquat Sci

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This study aims to estimate the smallest size of mature individuals that can be exploited. Fish samples of Coryphaena hippurus were collected from Kalinaun fishermen's catches in the Molucca Sea. They were sexed, then the fork length (FL) and maturity stage were recorded. Results showed that C. hippurus in the Molucca Sea had a sex ratio of 1:1.94 (p < 0.05). Males had a length range of 499-831 mm FL and females were in the length range of 481-813 mm FL. Size at first maturity was estimated as 529 mm FL for males with a range of 475-588 mm FL and 405 mm FL for females. This study provided basic information for future management needs of the dolphinfish, especially in the Molucca Sea.

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“…Aspek biologi yaitu pola pertumbuhan, parameter populasi dan Lm merupakan dasar dalam pengelolaan sumberdaya ikan yang berkelanjutan (Gomez-Marquez et al, 2008). Nilai Lm ikan nila di Waduk Jatiluhur hampir sama dengan ikan nila di Waduk Ziway dan Fincha yaitu 18,8 dan 24,5 (Tesfahun, 2018) namun lebih besar jika dibandingkan dengan Danau Abu-zabal, Mesir yaitu 10,5 dan 11,5 cm untuk ikan betina dan jantan (Shalloof dan Salama, 2008). Penetapan ukuran ikan boleh ditangkap lebih besar dari nilai L m dapat meningkatkan produksi perikanan dan biomassa ikan nila di Danau Victoria (Njiru et al, 2008).…”

Section: Pembahasanunclassified

UKURAN PERTAMA KALI MATANG GONAD DAN SELEKTIVITAS JARING INSANG IKAN NILA (Oreochromis niloticus) DI WADUK JATILUHUR, JAWA BARAT

Warsa¹,

Astuti²

2019

BERITABIOLOGI

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A gillnet is a common fishing gear for exploitation and fish capture at Jatiluhur Reservoir. The fish size captured by the gillnet depends on the mesh size for its selective fishing gear. Determination of gillnet mesh size is one of effort for fisheries management. The management of nile tilapia (Oreochromis niloticus) is based on gillnet selectivity and reproductive biology of nile tilapia. The aim of the research was to estimate length at the first mature (Lm) and gillnet selectivity for nile tilapia. The research was conducted at February-September 2017 through experimental fishing using gillnet with 1.0–4.0 mesh size (interval 0.5 inch). The gillnet installation was performed at six stations, namely Cihuni-Cibadak, Sungai Cikanyayan, Sungai Ciririp, Sungai Cihonje, Pasir Kole and Cilalawi. The Lm of nile tilapia was 18.3 and 23.3 cm for female and male, respectively. The total length retained in the gillnet with the highest probability for mesh size 1.0; 1.5; 2.0; 2.5; 3.0; 3.5 and 4.0 inches were 9.5; 12.5; 14.5; 18.5; 20.5; 26.5 and 30.5 cm, respectively. The minimum mesh size used for nile tilapia exploitation was ≥3 inches because it was able to catch nile tilapia with the total length larger than Lm (Lc>Lm) and with an SPR value of > 40% so that the tilapia resource in the Jatiluhur Reservoir remains sustainable.

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Overview of Length-Weight Relationship, Condition Factor and Size at First Maturity of Nile tilapia Oreochromis niloticus (L.) in Different Water Bodies of Ethiopia: A Review

Cited by 13 publications

References 20 publications

Stock status of Nile tilapia (Oreochromis niloticus) in Aneuk Laot Lake, Sabang District, Aceh Province, Indonesia

Stock status of Nile tilapia (Oreochromis niloticus) in Aneuk Laot Lake, Sabang District, Aceh Province, Indonesia

Estimation of first maturity size of dolphinfish Coryphaena hippurus Linnaeus in the Molucca Sea, North Sulawesi, Indonesia

UKURAN PERTAMA KALI MATANG GONAD DAN SELEKTIVITAS JARING INSANG IKAN NILA (Oreochromis niloticus) DI WADUK JATILUHUR, JAWA BARAT

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