Age, Growth, and Gonadosomatic Index (GSI) of Mediterranean Horse Mackerel (Trachurus mediterraneus Steindachner, 1868) in the Eastern Black Sea

Şahin, Cemalettin; Kasapoğlu, Nazlı; Gözler, Ahmet Mutlu; Kalayci, Ferhat; Hacimurtazaoğlu, Necati; Mutlu, Cengiz

doi:10.3906/zoo-0805-26

Cited by 13 publications

(1 citation statement)

References 10 publications

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“…Compared to males analysed in the off season (0.765% AE 0.21%), GSI was notably higher in individuals during the spawning (2% AE 0.05%) season [46]. In addition, a remarkable variation in GSI (0.3% AE 0.188%-1.756% AE 0.049%) was found in the Mediterranean horse mackerel (Trachurus mediterraneus) in relation to the sampling period [54]. The spawning season of the razorfish is relatively long, in Europe it takes place from April to July at temperature ranging from 19 to 22°C [1,[25][26][27][28].…”

Section: The Investigation Of Spermatogenesismentioning

confidence: 80%

Biological Parameters and Spermatogenesis in Razorfish (Pelecus cultratus) Population Inhabiting the Largest Shallow Lake of Central Europe (Lake Balaton): Studies for In Vitro Conservation Purposes

Bokor,

Fodor,

Várkonyi

et al. 2024

Aquaculture Research

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The study aimed to investigate body parameters and the process of spermatogenesis from April to September. In addition, it sought to test the applicability of sperm cryopreservation for conservation purposes in a razorfish (Pelecus cultratus) population of Lake Balaton, the largest shallow lake in Central Europe. During the aforementioned period, measurements were taken for the standard length (SL, cm) and body weight (BW, g), and the sex of specimens was determined. Cells at different stages of spermatogenesis (spermatogonia-SG, spermatocytes-SC, spermatids-ST, and spermatozoa-SZ) were quantified monthly for each male sample. Sperm samples collected at the end of May were cryopreserved using a method designed for common carp. No significant differences were found between males (SL: 25 ± 2 cm and BW: 146 ± 38 g) and females (SL: 26 ± 3 cm and BW: 168 ± 53 g) in terms of measured body parameters. No significant correlations were found between the sex, SL, and BW. High standard deviations were observed for all mean values in all sampling periods, possibly due to the low number of individual samples per month. A significantly higher proportion of SC compared to SZ was found in April. In May, no differences were observed between the four groups. Significantly more SG and SZ than SC and ST were observed in June. In August and September, a slight dominance in the number of SG was recorded, with no differences measured among the cells in different developmental stages. The males studied exhibited a low gonadosomatic index (0.92% ± 0.27%). A significant reduction was recorded in motility (MOT), progressive motility (pMOT), and in most of the kinetic parameters (distance curved line-DCL, curvilinear velocity-VCL, straight line velocity-VSL, and beat cross frequency-BCF). The spermiation of males could have started in May and conceivably lasted until the end of June. It is recommended to increase sperm quality and quantity before cryopreservation.

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Section: The Investigation Of Spermatogenesismentioning

confidence: 80%

Biological Parameters and Spermatogenesis in Razorfish (Pelecus cultratus) Population Inhabiting the Largest Shallow Lake of Central Europe (Lake Balaton): Studies for In Vitro Conservation Purposes

Bokor,

Fodor,

Várkonyi

et al. 2024

Aquaculture Research

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Analysis of the state of conservation of Trachurus trachurus in the Western Mediterranean Sea based on the interannual (2009–2020) changes in their life history traits

Rodríguez-Castañeda,

Ventero,

Iglesias

2023

Mar Biol

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Horse mackerel is a semi-pelagic fish widely distributed in the eastern Atlantic, where it represents a species of interest for fisheries and is subject to intense exploitation, leading to its global classification as a vulnerable species by IUCN. In the Northwestern (NW) Mediterranean Sea, the knowledge of their distribution, abundance and main biological parameters is fundamental to achieve their sustainable exploitation and contribute to the ecosystem approach to fisheries management. The time series (2009–2020) data set analyzed in this study came from two geographical subareas (GSAs) defined by the General Fisheries Commission for the Mediterranean (GFCM), Northern Spain (GSA06) and Northern Alboran Sea (GSA01) sampled in July during the MEDiterranean International Acoustic Survey (MEDIAS). Our results suggest that in summer, a higher concentration and aggregation of fish exists in GSA01, with a density ten times greater than in GSA06. Possible life history changes can be inferred through the analysis of the biological parameters of Trachurus trachurus in the NW Mediterranean Sea. In both GSAs, the annual decline of the size at first maturity (L50) and condition factor (Kn) was prominent. Moreover, the population structure lacked adult modes that could guarantee a successful recuperation of future stocks. Nonetheless, fish inhabiting GSA01 seem to have a better adaptive response to the events responsible for these alterations. In comparison, GSA01 is under less fishing pressure and the upwelling occurring in this area contributes to a higher availability of food, in addition to reducing the increases in sea surface temperature due to climate change during the study period.

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Changes in the Reproductive Period of Mediterranean Horse Mackerel and Blunt-Snouted Mullet Living in the South-Western Crimean Shelf in 2016–2021

2023

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Age, Growth, and Gonadosomatic Index (GSI) of Mediterranean Horse Mackerel (Trachurus mediterraneus Steindachner, 1868) in the Eastern Black Sea

Cited by 13 publications

References 10 publications

Biological Parameters and Spermatogenesis in Razorfish (Pelecus cultratus) Population Inhabiting the Largest Shallow Lake of Central Europe (Lake Balaton): Studies for In Vitro Conservation Purposes

Biological Parameters and Spermatogenesis in Razorfish (Pelecus cultratus) Population Inhabiting the Largest Shallow Lake of Central Europe (Lake Balaton): Studies for In Vitro Conservation Purposes

Analysis of the state of conservation of Trachurus trachurus in the Western Mediterranean Sea based on the interannual (2009–2020) changes in their life history traits

Changes in the Reproductive Period of Mediterranean Horse Mackerel and Blunt-Snouted Mullet Living in the South-Western Crimean Shelf in 2016–2021

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