Weight–length Relationships and Fulton’s Condition Factors of Ten Commercially Important Scombridae Fish Species in Southeast Coast of India, Bay of Bengal

Kannan, K.; Ethiraj, Kannapiran; Sekar, Sivaranjani; Rajendran, Kumar; Krishnamoorthy, M.; Dharmaraj, Divya

doi:10.1007/s41208-021-00390-5

Cited by 3 publications

(2 citation statements)

References 12 publications

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“…Weight usually has a higher coefficient of variation than length because at a given length fish can exhibit quite different weights depending upon food abundance and other environmental factors. In order to relate length and weight the condition factor (K, typically defined as K = 100* W/L3, where W is the weight and L is the length) is used (Karuppiah et al, 2022). There are three ways to determine length: a) standard length (SL), the length measured from the tip of the snout to the posterior end of the last vertebra, i.e., the length without the caudal tail, b) fork length (FL), the length measured from the tip of the snout to the end of the middle caudal fin rays, used in fishes in which it is difficult to tell where the last vertebra ends, and c) total length (TL), the length measured from the tip of the snout to the tip of the longer lobe of the caudal fin (Froese, 2006).…”

Section: Data To Be Collected From the Same Individualsmentioning

confidence: 99%

Age estimation in fishes using epigenetic clocks: Applications to fisheries management and conservation biology

Piferrer

Anastasiadi

2023

Front. Mar. Sci.

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The distribution of age classes is a key demographic parameter of populations and thus proper age estimation is crucial for fisheries management and for conservation biology. Age estimation in fishes has traditionally relied on the analysis of growth marks in hard structures such as otoliths. However, besides being lethal this method is time-consuming, can have low accuracy in some species and cannot be applied in others. Thus, there is a need for the development of new methods. DNA methylation is an epigenetic modification consisting in the addition of a methyl group in cytosine-guanine loci. Aging is associated with changes in DNA methylation. Among a background of global and weak genome hypomethylation, there are some loci in which age-associated DNA methylation changes are of a “clock-like” nature and thus predictable. Chronological age estimators built from DNA methylation are termed ‘epigenetic clocks’. Epigenetic clocks have been developed in the last ten years for many species, notably vertebrates, including already several fish species. Here, we review the piscine epigenetic clocks built so far and outline the major considerations to be taken into account for the development of new epigenetic clocks for additional species, which include the number of samples to be collected and tissues to be targeted. The steps on how to develop such a clock and the techniques available to do so are also discussed. Next, we focus on the features of epigenetic clocks as measuring devices, considering aspects such as accuracy, precision and reproducibility. Finally, we discuss the possibility of developing a multi-species piscine epigenetic clock and how processing automation can greatly reduce the cost per sample. One important knowledge gap is to determine how environmental changes, especially temperature and food availability, may affect the tick rate of piscine epigenetic clocks. Improved age prediction through the use of piscine epigenetic clocks can contribute to better fisheries management practices in a context of overexploited fish stocks worldwide, and in the estimation of age classes in endangered species.

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Section: Data To Be Collected From the Same Individualsmentioning

confidence: 99%

Age estimation in fishes using epigenetic clocks: Applications to fisheries management and conservation biology

Piferrer

Anastasiadi

2023

Front. Mar. Sci.

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“…Scombridae family members mostly are important fisheries commodities with high economical value and high demands from worldwide. Fisheries regulation management needs to be supported by systematic research data as from biological studies, the data can be the basis for management and conservation of commercial species as Scombridae [14]. Profiling otolith morphology in this study, can be the basis for taxonomic and conservation approaches in the future, especially for S. australasicus and R. brachysoma in Java Sea.…”

Section: Introductionmentioning

confidence: 90%

Asymmetrical individual both left and right otoliths of Tuna Scombrini collected from the Java Sea

Wiadnya,

Khamidah,

Paricahya

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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Otolith can be used as a natural marker of fish stock or anomalies between individuals within fish stock. This research aims to study the relationships between fish length and otolith length and confirm differences in otolith shape between species in the Scombrini tribe and Carangidae family (Decapterus ruselli). Sample used in our analysis were collected around July - September 2023 from three different location, Rastrelliger brachysoma (Lekok waters, Pasuruan), Scomber australasicus (Bali Strait waters) and Decapterus ruselli (Sendang Biru, South Malang). Total 96 specimens were identified based on morphological character as Rastrelliger brachysoma, Scomber australasicus and Decapterus ruselli. Each of following samples were cut horizontally at the frontal head to open the skull and remove sagitta otolith below the hindbrain using dissecting set, then cleaned and stored dry in microtube 1,5 ml separately for left and right to further documented using Celestron Digital Microscope Pro Gray USB 44308. Otolith morphometric data collected includes maximum length using TpsDig and weight using analytical balance. The relationship between Forked Length (FL) and otolith length, length-weight relationship of otolith was determined using simple linear regression on software Statistical Product and Service Solutions (SPSS). Paired sample t-test was applied to determine asymmetrical size of left and right otoliths. In this study, it was found that the shape of the otoliths between species has differences in the rostrum, antirostrum, ventral and dorsal parts. FL-otolith length relationship of S. australasicus, R. brachysoma and D. ruselli are Y=0,725+0,164X, r2= 0,519; Y=0,191+0,230X, r2= 0,911; Y=3,156+0,075X, r2=0,071 respectively. The LW sagitta relationship shows that there is a very strong relationship (P<0,05) between L and W of otoliths. The results of the Paired Sample T-test showed that there was no significant difference in the size of the left and right otoliths (Sig>0.05). Otolith shape is influenced by fish behaviour, diet and environment and it may be used as additional information to distinguish between tribe or even species. Otherwise, its asymmetric relationship and LW relationship may be potential new methods for stock discrimination and have other implications such as stock assessment, understanding natural asymmetry, and its potential applications in fisheries management and conservation.

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Length-Weight Relationships of Eight Fish Species Collected as Bycatch from Deep-Sea Shrimp Trawls Operated in the Arabian Sea

Nihal,

Aneesh Kumar,

Saha

et al. 2024

Thalassas

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Weight–length Relationships and Fulton’s Condition Factors of Ten Commercially Important Scombridae Fish Species in Southeast Coast of India, Bay of Bengal

Cited by 3 publications

References 12 publications

Age estimation in fishes using epigenetic clocks: Applications to fisheries management and conservation biology

Age estimation in fishes using epigenetic clocks: Applications to fisheries management and conservation biology

Asymmetrical individual both left and right otoliths of Tuna Scombrini collected from the Java Sea

Length-Weight Relationships of Eight Fish Species Collected as Bycatch from Deep-Sea Shrimp Trawls Operated in the Arabian Sea

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