Age and growth of pawak croaker Pennahia pawak in Beibu Gulf

YuChen, Yan; Hou, Gang; Lu, Huosheng; Yin, Qiqun

doi:10.3724/sp.j.1118.2011.00145

Cited by 5 publications

(7 citation statements)

References 17 publications

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“…Indeed, the average stock density of many important fishes is only 10% of what it was in the 1960s (Zhang et al, 2021;Su et al, 2022). According to Yuan (1995), fishery resource density along the coast of Beibu Gulf was approximately 5 tons per km 2 in the 1960s, but was 3 ton per km 2 by the end of the 1970s. In our investigation, the average catch density in Weizhou Island in the northeast part of the Beibu Gulf was 686 kg per km 2 , indicates that the fishery resources in the northeast of the Beibu Gulf are in serious decline.…”

Section: Phylogenetic Diversity Of Nekton Community Increased Appreci...mentioning

confidence: 99%

“…Nonmetric multidimensional scaling ordination plots of phylogenetic alpha diversity of nektonic communities occurring in spring and autumn based on mean pairwise distance (A) and mean nearest taxon distance (B). of the Beibu Gulf (Yuan, 1995;Hou et al, 2008;Wang et al, 2012;Zhang et al, 2014;Xu et al, 2021b).…”

Section: Phylogenetic Diversity Of Nekton Community Increased Appreci...mentioning

confidence: 99%

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Seasonal variability of nektonic community structure and phylogenetic diversity in Weizhou Island, the Beibu Gulf

Tang

et al. 2023

Front. Mar. Sci.

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The favorable natural conditions and variety of habitats in the Beibu Gulf provide a basis for harboring a high diversity of marine organisms. Sustainable coastal ecosystem management can be benefited from a comprehensive assessment of species diversity. In this study, we analyzed the seasonal changes in nektonic phylogenetic and community structures in the waters of Weizhou Island in the northern Beibu Gulf. The results showed that both the nektonic phylogenetic diversity and community structure in the northern Beibu Gulf exhibited strong seasonal differences between spring and autumn. The catch density was 291.9 kg per km2 in spring and 1081.1 kg per km2 in autumn. Phylogenetic diversity of nektonic communities obviously increased from spring to autumn, while phylogenetic patterns changed from clustering to overdispersion. The seasonal patterns of nektonic communities were mainly related to the different fishing intensities in spring and autumn. Summer fishing intensity in the Beibu Gulf was effectively controlled by a mid-summer fishing moratorium, during which nektonic diversity and fish stocks rapidly recovered from the larval pool. Our study revealed that fishing intensity had a greater impact on nektonic communities at smaller spatial scales, and even exceeded the effects of environmental factors.

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Section: Phylogenetic Diversity Of Nekton Community Increased Appreci...mentioning

confidence: 99%

Section: Phylogenetic Diversity Of Nekton Community Increased Appreci...mentioning

confidence: 99%

Seasonal variability of nektonic community structure and phylogenetic diversity in Weizhou Island, the Beibu Gulf

Tang

et al. 2023

Front. Mar. Sci.

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“…The spatial niche width of P. pawak increased while that of P. anea decreased after the summer close season. P. pawak spawns in the April-August period [ 25 ], and the summer close season (May 1) facilitates the protection of the spawning population and juveniles, thus increasing its resource density. P. anea spawns in the March-June period [ 23 ], two months earlier than the summer close season.…”

Section: Discussionmentioning

confidence: 99%

“…Pennahia pawak and Pennahia anea have relatively important ecological niches as relatively stable resource fish species in the Beibu Gulf [19]. Studies on P. pawak and P. anea have mainly focused on fishery biology [20,21], growth and mortality [22], reproductive biology [23], population structural characteristics and spatial-temporal distribution [24,25], and feeding ecology [26], whereas studies on the interspecies feeding relationship between P. pawak and P. anea have not been reported. These two co-distributed species are not only closely related, but also similar in size, shape, and ecology [19].…”

Section: Introductionmentioning

confidence: 99%

The Sympatric Coexistence Mechanism: A Case Study of Two Penahia Species in the Beibu Gulf, South China Sea

Luo,

Yang,

Zhou

et al. 2024

Animals

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The study of trophic relationships among closely related species plays an important role in deepening our understanding of the resource utilization characteristics, differentiation patterns, and population dynamics of co-occurring species in the same habitat. This research uses two congeneric fish species, Pennahia pawak and Pennahia anea, as examples. Based on a stomach content analysis and a carbon–nitrogen stable isotope analysis, a comparative analysis of their feeding habits and trophic niches is conducted. Additionally, a spatial niche analysis is employed to explore the coexistence and competitive mechanisms between these two closely related fish species. The results show that specialized feeding habits mitigate intraspecific competition as the population densities increase. The carbon and nitrogen stable isotope analysis reveals variations in the feeding habits and trophic levels with body length, indicating adaptive shifts in prey selection. Despite similar food resources, niche differentiation arises due to differences in dominant prey, facilitating coexistence. Differences in spatial niche further contribute to niche separation and coexistence. In resource-limited environments, species such as Pennahia utilize trophic and spatial niche differentiation to collectively exploit resources and achieve coexistence, with implications for fishery management favoring Pennahia resource occupancy capabilities.

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“…When determining the age under the microscope, several methods can be used for teleost fishes, including the commonly used integral counting method (integral method) where the age is the count of opaque bands, ignoring the growth within a year reflected in the width of the outmost translucent bands [28][29][30][31], and the back-calculate method where the age was determined as the proportion of the hypothesized hatching date to the sampling date plus the number of opaque bands [32,33]. Daily increments count has also been used [34].…”

Section: Introductionmentioning

confidence: 99%

Length–Weight Relationships, Growth Models of Two Croakers (Pennahia macrocephalus and Atrobucca nibe) off Taiwan and Growth Performance Indices of Related Species

Huang

Chang

Lai

et al. 2022

Fishes

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Information on age and growth is essential to modern stock assessment and the development of management plans for fish resources. To provide quality otolith-based estimates of growth parameters, this study performed five types of analyses on the two important croakers that were under high fishing pressure in southwestern Taiwan: Pennahia macrocephalus (big-head pennah croaker) and Atrobucca nibe (blackmouth croaker): (1) Estimation of length–weight relationships (LWR) with discussion on the differences with previous studies; (2) validation of the periodicity of ring formation using edge analysis; (3) examination of three age determination methods (integral, quartile and back-calculation methods) and selection of the most appropriate one using a k-fold cross-validation simulation; (4) determination of the representative growth models from four candidate models using a multimodel inference approach; and, (5) compilation of growth parameters for all Pennahia and Atrobucca species published globally for reviewing the clusters of estimates using auximetric plots of logged growth parameters. The study observed that features of samples affected the LWR estimates. Edge analysis supported the growth rings were formed annually, and the cross-validation study supported the quartile method (age was determined as the number of opaque bands on otolith plus the quartile of the width of the marginal translucent band) provided more appropriate estimates of age. The multimodel inference approach suggested the von Bertalanffy growth model as the optimal model for P. macrocephalus and logistic growth model for A. nibe, with asymptotic lengths and relative growth rates of 18.0 cm TL and 0.789 year−1 and 55.21 cm, 0.374 year−1, respectively. Auximetric plots of global estimates showed a downward trend with clusters by species. Growth rates of the two species were higher than in previous studies using the same aging structure (otolith) and from similar locations conducted a decade ago, suggesting a possible effect of increased fishing pressure and the need to establish a management framework. This study adds updated information to the global literature and provides an overview of growth parameters for the two important croakers.

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Age and growth of pawak croaker Pennahia pawak in Beibu Gulf

Cited by 5 publications

References 17 publications

Seasonal variability of nektonic community structure and phylogenetic diversity in Weizhou Island, the Beibu Gulf

Seasonal variability of nektonic community structure and phylogenetic diversity in Weizhou Island, the Beibu Gulf

The Sympatric Coexistence Mechanism: A Case Study of Two Penahia Species in the Beibu Gulf, South China Sea

Length–Weight Relationships, Growth Models of Two Croakers (Pennahia macrocephalus and Atrobucca nibe) off Taiwan and Growth Performance Indices of Related Species

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