Population Status of Two Wedgefish Species in Western Indonesian Inner Waters, Inferred from Demographic Models with Limited Data

Kurniawan, Wanwan; Oktaviyani, Selvia; Simeon, Benaya Meitasari; Ula, Shoimatul; Yuwandana, Dwi Putra; Yuneni, Ranny R.; Yudiarso, Permana; Chodrijah, Umi; Fahmi, Fahmi

doi:10.1134/s003294522103005x

Cited by 2 publications

(2 citation statements)

References 47 publications

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“…However, this difference could also indicate a lack of older fish in the population (Hale & Baremore, 2013) and in the sample. In a study conducted by Kurniawan et al (2021) in Indonesian waters, similar findings were observed, including a right-skew in the length frequency distribution. The study proposed that the use of non-selective fishing gear might contribute to the vulnerability of both young and adult fish to fishing activities.…”

Section: Size Compositionsupporting

confidence: 71%

“…This difference may be due to the insufficient sample variation, which can interfere with estimating the VBGF using the Ford-Walford plot. Previous studies on R. australiae have found different VBGF parameters, including k=0.460, L∞=330.00, t 0 =-1.18, n=407 (Faizah & Chodrijah, 2020); k=0.095, L∞=307.90, n=2064 (Kurniawan et al, 2021); and k=0.41, L∞=204.50 cm, n=47 (White et al, 2014). The disparity in VBGF parameters between the current study and previous studies could be due to several factors, including the age and size of the fish population, the types of fishing gear used, and the location of the study.…”

Section: The Von Bertalanffy Growth Function Parametersmentioning

confidence: 92%

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FISHERIES AND BIOLOGICAL INFORMATION OF BOTTLENOSE WEDGEFISH (Rhynchobatus australiae) IN PULAU KAMBING FISH LANDING PORT TERENGGANU

Noor Iskandar,

Fadzli,

Ahmad Sharikin

et al. 2023

UMT JUR

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Rhynchobatus australiae is a species of wedgefish that is vulnerable to overfishing due to their life history characteristics This study aimed to determine the fisheries and biological information of R. australiae in Terengganu waters. A total of 26 fish were collected over a 3-month period in Pulau Kambing Fish Landing Port, Terengganu and analysed for abundance, length frequency distribution, LWRs, and growth parameters. Results showed that the abundance of R. australiae in Terengganu was higher compared to the estimation made in other locations, with a CPUE of 49.05 kg/haul and 9.15 kg/day. The LWRs for males, females, and pooled sexes were a = 0.0057 and b = 2.9404, a = 0.0018, b = 3.2078, and a = 0.0029, b = 3.0979, respectively. The von Bertalanffy Growth parameters for male, female, and pooled sexes of R. australiae were k = 0.035, L∞ = 332.825, t0 = -4.495, k = 1.005, L∞ = 43.161, t0 = -2.99, and k = 0.089, L∞=222.412, t0=-2.565, respectively. Males R. australiae exhibiting a higher average length than females. This study was limited in terms of the time span covered and the sample size, which may have introduced variability in the results and may not be representative of the larger fish population. However, the results of this study may serve as preliminary data for the fish population dynamics of R. australiae in Terengganu waters and could be used to guide future research. Future study with a longer time span and a larger, more diverse sample size are needed to estimate the abundance and size of R. australiae more accurately in this region.

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Section: Size Compositionsupporting

confidence: 71%

Section: The Von Bertalanffy Growth Function Parametersmentioning

confidence: 92%

FISHERIES AND BIOLOGICAL INFORMATION OF BOTTLENOSE WEDGEFISH (Rhynchobatus australiae) IN PULAU KAMBING FISH LANDING PORT TERENGGANU

Noor Iskandar,

Fadzli,

Ahmad Sharikin

et al. 2023

UMT JUR

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A tangled web: global review of fishing interactions with rhino rays

Pytka,

Kyne,

Carlson

et al. 2023

Rev Fish Biol Fisheries

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Rhino rays (Order Rhinopristiformes) are one of the most threatened vertebrate groups. Despite overfishing being recognised as the greatest threat to this group, a comprehensive assessment of the fisheries and types of fishing gear that rhino rays interact with is lacking. We reviewed published and grey literature (n = 116 references) to evaluate interactions between rhino rays and fisheries, determine gear types most responsible for their capture, and species for which most interactions occur by region. Interactions (n = 420) were reported from 37 of 88 range states, for 52 of 68 known species. Combined, 59% of the literature reported interactions from trawlers and gillnets. Wedgefishes (Rhinidae) were the most reported family (29%) and bowmouth guitarfish (Rhina ancylostomus) the most reported species (9.5%). Asia accounted for half of interactions (n = 211), with 67% of the literature from unspecified gear (e.g., mixed landings), masking gear-specific interactions. Data quality was variable, with the highest resolution in countries with lower species diversity and where species are least imperiled (e.g., Australia). Discard mortality and physiological effects of capture are poorly known with data available for 25% of species (almost exclusively from Australia and the Americas). While additional data are urgently required to quantify the true extent of rhino ray catch globally, reducing fisheries mortality is a priority and key to address declining populations. Recommendations include prioritizing spatial management in critical habitats (e.g., nursery areas), expansion in the use of proven bycatch reduction devices, encouraging safe release and handling, and addressing drivers of retention and trade.

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Population Status of Two Wedgefish Species in Western Indonesian Inner Waters, Inferred from Demographic Models with Limited Data

Cited by 2 publications

References 47 publications

FISHERIES AND BIOLOGICAL INFORMATION OF BOTTLENOSE WEDGEFISH (Rhynchobatus australiae) IN PULAU KAMBING FISH LANDING PORT TERENGGANU

FISHERIES AND BIOLOGICAL INFORMATION OF BOTTLENOSE WEDGEFISH (Rhynchobatus australiae) IN PULAU KAMBING FISH LANDING PORT TERENGGANU

A tangled web: global review of fishing interactions with rhino rays

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