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Glavić, Katarina; Dobroslavić, Tatjana; Bartulović, Vlasta; Matić‐Skoko, Sanja; Glamuzina, Branko

doi:10.4194/1303-2712-v14_1_18

Cited by 3 publications

(3 citation statements)

References 15 publications

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“…In this study, the spawning season was corroborated by the GSI results. Similar spawning seasons were obtained for the Azores [69] and the Adriatic Sea [18].…”

Section: Discussionsupporting

confidence: 60%

“…Based on the previous age determination results for this species [75], these lengths correspond to ages of 4.2 years for females and 2.5 years for males. The lengths at first maturity estimated in this study were different from the estimates of 31 and 33 cm TL obtained for females and males, respectively, of the forkbeard from the Adriatic Sea [18], and 41 and 36 cm TL for females and males (respectively) from the Azores [69], which were both based on macroscopic observation. Differences between histological and macroscopic ogives normally arise from the difficulty of distinguishing macroscopically immature from regenerating fishes, and maturity phase assignment by histological staging gives less biased estimates of maturity [27].…”

Section: Discussionmentioning

confidence: 85%

“…Despite the commercial importance of the forkbeard, no information on the reproductive strategy of this species exists. Some parameters, such as the spawning season and length at first maturity, have already been described for specimens from the Azores [69] and the Adriatic Sea [18]. Therefore, this study intends to define the reproductive strategy of forkbeard from the Portuguese continental coast.…”

Section: Introductionmentioning

confidence: 99%

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Reproductive strategy of forkbeard, Phycis phycis, from the Portuguese coast

et al. 2016

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Knowing fish reproductive strategy is essential for understanding population dynamics. This study intends to define the spawning season, length at first maturity, fecundity type, and estimate fecundity of forkbeard, Phycis phycis, from the Portuguese coast. Monthly samples collected from commercial landings between May 2011 and December 2012 were used. Results show that forkbeard is a group-synchronous and batch spawner species. Mature females were found between September and January, mature males were found between August and January, and a significant concomitant increase in gonadosomatic index suggests a spawning season from September to January. Length at first maturity was estimated as 35.9 and 28.5 cm TL for females and males, respectively. Reproductive abnormalitiesmosaic intersex, follicular cysts in ovaries, and early mature males-were detected. For fecundity-type definition, a hiatus between primary and secondary growth oocytes was detected. A significant increase in the mean diameter of secondary growth oocytes and a decreasing trend in their number during the spawning season were observed. The intensity of α-atresia was low throughout the spawning season. These four criteria suggest that forkbeard has determinate fecundity. Mean relative annual fecundity estimated was 1833 ± 857 oocytes g −1 gutted weight. Nonreproductive females that skipped a spawning season attained 36.1 %.

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“…In this study, the spawning season was corroborated by the GSI results. Similar spawning seasons were obtained for the Azores [69] and the Adriatic Sea [18].…”

Section: Discussionsupporting

confidence: 60%

Section: Discussionmentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

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Reproductive strategy of forkbeard, Phycis phycis, from the Portuguese coast

et al. 2016

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Diet and feeding strategy of the forkbeard Phycis phycis (Pisces: Phycidae) from the Portuguese continental coast

et al. 2017

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The diet and feeding behaviour of the forkbeard Phycis phycis was studied based on 246 stomachs collected between May 2011 and April 2012 from a commercial fleet operating off the central west coast of Portugal. A total of 44 prey items were identified in the stomachs which were merged into major groups to avoid problems with low expected frequencies. The following taxonomic categories were considered: non-decapod Crustacea, Caridea, Anomura, Munida spp., Processa spp., Brachyura, Pisces, Trisopterus luscus. In order to investigate possible diet differences between fish size classes, a cluster analysis was performed using the mean abundance of each prey group by forkbeard 5 cm length class, and three length groups (LG) were obtained: <22.5, 27.5–37.5 and >42.5 cm. Seasonally, Caridea was the main prey group during winter and autumn while Pisces was predominant during the rest of the year. Caridea was the most important prey group for LG1 and LG2 while in LG3 Pisces was the principal one. The forkbeard feeding behaviour may be characterized as presenting a shift pattern from a more generalist diet (small Crustacea, mainly Caridea) in the young adults to a more specialist strategy (teleosts) in the adults.

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Crustacean prey in the diet of fishes from deep waters of the Eastern Ionian Sea

et al. 2018

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The gut analysis of 26 fish species caught in the deep waters of the Eastern Ionian Sea showed that crustaceans were a substantial resource for fish found in deep- water environments, comprising 37 crustacean taxa. Among all species examined, 77% included crustaceans in their guts. Dendrobranchiata/Caridea shrimps were the most frequent crustacean prey found in the guts of almost all examined fishes, with high values of relative abundance (N%). Season (summer, autumn) and fish behaviour (demersal, benthic) were not found to affect the diet of the examined fish species. Galeus melastomus could be considered to be a separate case showing the most diverse diet comprising all the crustacean groups. Differences in the proportion of the main crustacean categories consumed by the examined fish species were observed. The low richness and preference towards specific crustacean taxa or different crustacean species could be considered as an indication of interspecific competition for the same food resource in the oligotrophic waters of the Eastern Mediterranean. The occurrence of different crustacean taxa in the gut of some species through the analysed seasons, could be related to differences in prey availability or to selective preference for certain prey which in turn could be linked to different energetic requirements for growth and reproduction of predators.

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Cited by 3 publications

References 15 publications

Reproductive strategy of forkbeard, Phycis phycis, from the Portuguese coast

Reproductive strategy of forkbeard, Phycis phycis, from the Portuguese coast

Diet and feeding strategy of the forkbeard Phycis phycis (Pisces: Phycidae) from the Portuguese continental coast

Crustacean prey in the diet of fishes from deep waters of the Eastern Ionian Sea

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