Recruitment pattern and length-at-first-capture of the silvercatfish &lt;i&gt;Chrysichthys nigrodigitatus&lt;/i&gt; Lacépède (1803): claroteidae in Lower Cross River, Southeast Nigeria

Udoidiong, O. M.; Ukpatu, John Etitigwun; Udoh, J. P.

doi:10.4314/tfb.v25i1.1

Cited by 6 publications

(5 citation statements)

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“…The instantaneous rate of total morality, natural mortality and fishing mortality recorded in this study are higher than the result reported by Francis and Erondu (2010) and Sikoki (2013) about the natural and fishing mortalities of the aforementioned species. In this study, the instantaneous fishing mortality of C. nigrodigitatus is higher than natural mortality.…”

Section: Discussioncontrasting

confidence: 87%

“…In this study, the instantaneous fishing mortality of C. nigrodigitatus is higher than natural mortality. This means that the death of C. nigrodigitatus recorded during the period was mostly caused by human exploitation, which is inconsistent with report of Francis (2003), Francis and Erondu (2010) and Sikoki (2013) on C. nigrodigitatus from Andoni river system. The death of C. nigrodigitatus caused by human is as a result of the consumers' preference which made the fishers to develop specific gears for harvesting it (Uneke and Nwani, 2014).…”

Section: Discussioncontrasting

confidence: 76%

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Some Biological Characteristics of Chrysichthys nigrodigitatus from Luubara Creek, Niger Delta, Nigeria

Nkuene,

Nwafili

2024

ejtas

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The study of biological characteristic of C. nigrodigitatus caught using multiple and single long-line was carried out for twelve months. The Von –Bertallanffy growth function was used to estimate the growth characteristics. The growth coefficient (K) and growth performance index (Ø) were 0.740 and 2.37, respectively, indicating it grows fast. The instantaneous rates of total, natural, and fishing mortality were 3.23, 1.18 and 2.05 per year, respectively. The resultant exploitation ratio was 0.635, indicating that the fishery was overexploited. More so, the ratio of length at first capture (Lc) to asymptotic length (L∞). (Lc/ L∞) depicted that this species was caught at a small size which may lead to growth over-fishing. The extreme mounting fishing pressure and harvesting silver catfish when the size small require application fishing regulations that will watch over the species in creek. Management regulation, particularly seasonal closures coinciding with the period of spawning, should be implemented to avoid the eventual collapse of this fishery.

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Section: Discussioncontrasting

confidence: 87%

Section: Discussioncontrasting

confidence: 76%

Some Biological Characteristics of Chrysichthys nigrodigitatus from Luubara Creek, Niger Delta, Nigeria

Nkuene,

Nwafili

2024

ejtas

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“…Backward projection of the obtained length frequency data was used in establishing the recruitment pattern (Mudoidiong et al, 2017;Nurul-Amin et al, 2008). Midpoint of the smallest length interval was used as length at first recruitment (Lr 50 ) (Gheshlaghi et al, 2012).…”

Section: Recruitment Patternmentioning

confidence: 99%

Estimates of Population parameters for Sardinella maderensis (Lowe, 1838) in the coastal waters of Ghana

Amponsah¹,

Ofori-Danson²,

Nunoo³

et al. 2019

Greener J Agr Sci

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This study examined some population parameters of Sardinella maderensis landed along the eastern coast of Ghana, based on length-frequency data from June, 2014 to January 2015. Overall, 1401 samples of S. maderensis were measured for standard length and resultant data analysed with FiSAT II. The asymptotic length (L ∞) and growth rate (K) were 23.63 cm SL and 0.61 yr-1 respectively. The theoretical age at birth (t 0) and growth performance index (ϕ) were-0.284 yr-1 and 2.532 respectively. The recruitment pattern was continuous with two recruitment pulses. Total mortality rate (Z), natural mortality rate (M) and fishing mortality rate (F) were 2.96 yr-1 , 1.30 yr-1 and 1.63 yr-1 correspondingly. Fishing mortality rate surpassed the optimum fishing rate which showed that the assessed fish species is under high fishing pressure. The estimated exploitation rate (E curr) was 0.55, implying that the stock is over-exploitation. VPA outcome revealed higher harvesting rate on individuals with length between 10-11 cm. The spawning biomass which was below the 30% of unexploited biomass indicated future recruitment failure of the stock. As a result, urgent management interventions such as the application of biological reference points and mesh size regulations are urgently recommended for sustainable exploitation of Sardinella maderensis.

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“…One that is used as a reference in the effort to manage fishery resources to remain sustainable is the estimation of the length at first capture (L c50 ) of S. lemuru. The L c50 is a vital parameter used along with length-at-first-maturity to indicate the health status of the resource (Udoidiong et al 2017). Knowledge of length at maturity and spawning season detects when and at which length the fish should be protected, and therefore, it is crucial for the proper management and conservation of fish stocks (Hunter et al 1992).…”

Section: Discussionmentioning

confidence: 99%

Reproductive Biology of Bali Sardines, Sardinella lemuru (Bleeker, 1853), in Tayabas Bay, Quezon, Philippines

Ramos,

Roque

2023

TPJF

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Fish reproductive biology plays a vital role in fishery management, an essential biological tool that would serve as a basis for formulating policies. In this study, 3,678 Sardinella lemuru were sampled to determine its reproductive biology characteristics from January 2014 to December 2016 at Tayabas Bay, Quezon. Fish samples were dissected, and the sex was determined based on the macroscopic features of the gonads. The results showed length sizes ranging from 6.5 cm to 19.6 cm TL. The sex ratio was significantly different from the expected 1:1 distribution. The fish's length and weight indicate allometric growth in both sexes. The length at first capture was 15 cm for females and 14.75 cm for males, which was lower than the length at first maturity of 15.89 cm. The spawning season occurred in the fourth to first quarter from 2014 to 2016, specifically from November to February. In February, the number of mature and spawning fishes increased in number and reached a peak. Likewise, the spawning and recruitment of S. lemuru did not vary from other locations like the Sulu Sea and Moro Gulf, which has a spawning period from October to December and December to January in Bali, Indonesia. The computed spawning potential ratio is 24%, near the Limit Reference Point (LRP), indicating that management measures should be directed toward the sustainability of the S. lemuru and its productivity in Tayabas Bay.

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Recruitment pattern and length-at-first-capture of the silvercatfish <i>Chrysichthys nigrodigitatus</i> Lacépède (1803): claroteidae in Lower Cross River, Southeast Nigeria

Cited by 6 publications

References 0 publications

Some Biological Characteristics of Chrysichthys nigrodigitatus from Luubara Creek, Niger Delta, Nigeria

Some Biological Characteristics of Chrysichthys nigrodigitatus from Luubara Creek, Niger Delta, Nigeria

Estimates of Population parameters for Sardinella maderensis (Lowe, 1838) in the coastal waters of Ghana

Reproductive Biology of Bali Sardines, Sardinella lemuru (Bleeker, 1853), in Tayabas Bay, Quezon, Philippines

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