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This study was performed to obtain information on the sex ratio, spawning period, and size at sexual maturity for fishery management of the largehead hairtail Trichiurus japonicus in Korean waters. The overall sex ratio (female, F; male, M) was 1:0.46 (n = 1274 females:589 males, 68.4% female) and as fish increased in length, the proportion of fema...
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The study was conducted in the freshwater station of the Bangladesh Fisheries Research Institute in Mymensingh between September 2021 and August 2022. Finding the sex ratio, sexual maturity, LWR, reproductive biology, fecundity, and histological examination of gonads of C. punctata were the main objectives of the present study. The correlation betw...
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... The difference in the sex ratio of the species could be due to differences in growth rate, sexual dimorphism, differential mortality rates and lifespan of male and female individuals (Vicenti and Araujo, 2003;Shin et al., 2023). Nonetheless, a skewed sex ratio is known to be a common feature among organisms (Fryxell et al., 2015). ...
The decline in commercially important fish stocks, particularly demersal species, is a growing
concern in Ghana, where these fish contribute significantly to food security. Despite their critical role,
a lack of comprehensive biological studies has hindered the development of effective sustainable
management strategies. This study aimed to address this gap by investigating key reproductive aspects
of Pagrus caeruleostictus, a commercially valuable demersal fish in Ghana. A total of 560 individuals
were sampled from the coast of Greater Accra, and their sex ratio, spawning cycle, and length at first
maturity were analyzed. The results revealed a skewed sex ratio of 1 male:0.67 female. The peak
spawning period for females occurred in April, while males peaked in March. The major spawning
seasons for females and males were identified as July-August and March-April, respectively. Notably,
larger size classes were dominated by males, supporting the hypothesis of protogyny in P. caeruleostictus.
The length at first maturity was 18.4 cm for females and 21.1 cm for males. These findings suggest that
the current minimum legal harvesting length, as outlined in Ghana’s Fisheries Regulation, should be
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... Trichiurus lepturus subjected to intensive fishing exploitation generally has lower L m50 values (Clain et al. 2023a). Shin et al. (2023) added that differences in the average length at first gonadal maturity of T. lepturus in each region were due to differences in the analytical methods used in determining adult fish and growth rates. The L s50 value of this fish is greater than the L m50 value. ...
The southern Java waters are characterized by a strong upwelling process, making the region a potential hotspot for fishing activities, including the largehead hairtail, Trichiurus lepturus Linnaeus, 1758. This study provides data on various aspects of T. lepturus in the southern Java waters, including reproductive biology, growth parameters, mortality rates, spawning potential ratio (SPR), and yield per recruit (Y/R). The results are intended to help sustain the management of T. lepturus fisheries in the southern Java waters. A total of 19 587 fish specimens were collected monthly between January 2019 and December 2021 from fishermen’s catches in the southern Java waters at the Palabuhanratu Archipelago Fishing Port, West Java Province, Indonesia. The data collected involved information on length, weight, sex, and gonads. Length-frequency data were analyzed using various fisheries assessment models. A length–weight relationship follows a positive allometric growth pattern. The sex ratio was slightly female-biased. Gonadal maturity stages (GMS) and the gonadosomatic index (GSI) indicated a prolonged spawning period. The length at first maturity (Lm50) males and females was estimated at 84.5 cm and 77.0 cm, respectively. The von Bertalanffy growth equation of T. lepturus in southern Java waters is Lt = 131.67(1 – e–0.22(t + 0.5094)). Total mortality (Z), natural mortality (M), and fishing mortality (F) were 1.60 year⁻¹, 0.44 year⁻¹, and 1.16 year⁻¹, respectively. The spawning potential ratio (SPR) was 26%, and the yield per recruit (Y/R) analysis suggested that the current fishing effort is above the maximum sustainable yield level. Trichiurus lepturus in southern Java waters is experiencing high fishing pressure, which may compromise its reproductive potential and long-term sustainability. Management measures should be implemented to regulate the fishing effort and ensure the sustainable exploitation of this vital fishery resource.
... These observations likely correspond to the species' spawning behavior, characterized by a group-synchronous spawning pattern featuring two or more distinct peaks. This inference is substantiated by the presence of two discernible clusters of oocytes with significantly different diameters, as reported in previous studies (Cha & Lee, 2004;Kim et al., 2020;Shin et al., 2023). ...
This study aimed to understand the reproductive biology and migrative behavior of the largehead hairtail Trichiurus lepturus in a tropical area, specifically off Pernambuco coast, northeastern Brazil. Commercial catches from fish corrals provided samples for analysis, including measurements, weight recording, and examination of gonads to determine its maturation stage. Reproductive analyses were performed, such as sex ratio, gonado‐somatic index, and sizes at first maturity. There was a slightly higher proportion of females among the 141 largehead hairtail specimens analysed. No significant differences were observed in length distributions between males and females. However, during the winter, significant differences were observed in length distributions for grouped sexes. The species exhibited a seasonal migratory pattern, with a higher presence on the continental shelf during the winter. The study identified strategic allocation of energy in feeding activities and temporal spacing of reproductive cycles, as indicated by the sex ratio and abundance of individuals during different seasons. Fish corrals probably do not harm largehead hairtail population off the southwestern Atlantic tropical coast, with minimal capture of individuals below the size of first maturity. The insights of the study into reproductive and migration patterns contribute to future assessments and management strategies for this species and corral fisheries.
... The determination of the sex ratio is analyzed using the following equation by (Shin et al. 2023). ...
Lelono TD, Bintoro G, Harlyan LI, Setyanto A, Rihmi MK, Rudianto D. 2023. Biological aspect approach in sustainable management of coral catshark Atelomycterus marmoratus (Anonymous [Bennett], 1830) in Bali Strait, Indonesia. Biodiversitas 24: 5873-5882. Coral catshark (Atelomycterus marmoratus) is a shark species that thrives in many coral reefs. to evaluate the biological aspects of A. marmoratus and their type of growth curve for a time series to support their sustainability. Sampling was performed from August 23rd, 2019, to March 31st, 2020. The morphological analysis was performed by recording or photographing to reduce possible errors. Then, the length-weight relationship, sex ratio, length at first captured and matured, and spawning ratio were evaluated. The present study demonstrated that the coral catshark captured in the cohort that produces two cohorts only happens in February. The sex ratio is 41.6% male and 48.4% female, which is considered healthy, whereas the remaining percentage is so severely damaged that its gender cannot be determined. The FISAT-II software analysis results in a von Bertalanffy growth formula of Lt = 76.21 (1-e-2.01(t+0.0596)) with t max = 1.49/ year and L max = 77.39 cm. They grow steadily or tend to slow down after they reach the age of 1.5 years, with an asymptotic length of 77.39 cm. The Lc value (67.5 cm) is more significant than their Lm value (53 cm), indicating that their sustainability is highly possible to maintain because only fish that have passed the spawning stage are captivated. The spawning potential rate (SPR) is 35%, with M = 0.66, E = 1.85, and F = 0.78. These results indicate that the exploitation rate of coral catshark is moderate because 20% < SPR < 40%. In conclusion, the A. marmoratus length-weight relationship is categorized as negative allometric, where the length grows faster than the weight.
... The East China Sea (ECS) is the primary spawning ground for T. japonicus in China; T. japonicus spawns almost year-round with multiple batches and two dominant spawning periods in the ECS [5][6][7]. It has been reported that T. japonicus follows a group-synchronous oocyte development pattern [8]. In the 1960s, the first sexually mature age of T. japonicus in the ECS was one year, and the minimum anal length of the mature individual was 200-210 mm. ...
... As the ovarian samples were used, the ovarian stromal tissue, follicle cells, and non-vitellogenic follicles would contribute some portion of the lipid composition. The quantitative significance of this would vary depending on the degree of maturity of the dominant oocytes [8,47]. ...
Trichiurus japonicus is an economically important fish that ranks 11th in global marine fish capture production. However, the reproductive characteristics of this fish have undergone notable changes in recent decades, potentially affecting the quality of offspring and sustainable utilization. To improve our understanding of the physiological regulation of maturation in T. japonicus, untargeted liquid chromatography mass spectrometry was utilized to identify the small molecules that characterize the comprehensive metabolic profiles of ovaries during ovary development from stage II to stage IV. According to the results of OPLS-DA, the ovarian metabolite profiles of the three developmental stages were separated. The concentrations of 124 and 100 metabolites were significantly altered between stage II vs. III and III vs. IV, respectively. Lipids and lipid-like molecules accounted for the largest proportion of the altered metabolites, followed by amino acids, peptides, and analogues. The significantly altered metabolites-enriched pathways differed slightly between stages II and III and stages III and IV. Steroid-related pathways were heavily affected during stages II to III, while significantly altered metabolites from stages III to IV were involved in oocyte-maturation-related pathways. Through metabonomics analysis, potentially important metabolic pathways and metabolites between different ovarian stages were detected, providing basic information for further investigation of maturation mechanisms in wild fish.
