scholarly journals Relationship between Sagittal Otolith Size and Fish Size in Engraulis encrasicolus and Sardina pilchardus (Osteichthyes: Clupeiformes) in the Southern Aegean Sea, Turkey

2018 ◽  
Vol 33 (3) ◽  
pp. 72-76
Author(s):  
Gokcen Bilge ◽  
Keyword(s):  
Aegean Sea ◽  
Sardina Pilchardus ◽  
Fish Size ◽  
Engraulis Encrasicolus ◽  
Sagittal Otolith ◽  
Otolith Size

scholarly journals Biometric relationships between body size and otolith size in 15 demersal marine fish species from the northern Brazilian coast

2019 ◽  
Vol 49 (4) ◽  
pp. 299-306
Author(s):  
Rory Romero de Sena OLIVEIRA ◽  
Marcelo Costa ANDRADE ◽  
Fabiola Seabra MACHADO ◽  
Élida Jesana Santana CUNHA ◽  
Flaviane Souto de FREITAS ◽  
...  
Keyword(s):  
Stomach Contents ◽  
Coefficient Of Determination ◽  
Brazilian Coast ◽  
Marine Fish Species ◽  
Fish Size ◽  
Total Length ◽  
Marine Predators ◽  
Sagittal Otolith ◽  
First Time ◽  
Otolith Size

ABSTRACT The relationships between fish size and sagitta otolith measurements were calculated for the first time for 15 species belonging to six families from the northern Brazilian coast. A total of 220 fish were sampled from the bycatch landed by the bottom-trawl industrial shrimp-fishing fleet between August and September 2016. All species had strong relationships between otolith measurements and fish total length with the coefficient of determination (r 2) ranging between 0.71 and 0.99. The variable most strongly related to fish total length was found to be the sagittal otolith length (OL) with 98% of the variability. These relationships are a useful tool to estimate length and mass of preyed fish from otoliths found in stomach contents of marine predators.

scholarly journals Retention probability of purse seine grating sieve based on fish morphology

2021 ◽  
Vol 38 (2) ◽  
pp. 173-180
Author(s):  
Zafer Tosunoğlu ◽  
Sinan Mavruk ◽  
Nazlı Kasapoğlu
Keyword(s):  
Simulated Data ◽  
Aegean Sea ◽  
Purse Seine ◽  
Maximum Height ◽  
Sardina Pilchardus ◽  
Maximum Width ◽  
Engraulis Encrasicolus ◽  
Sardinella Aurita ◽  
First Maturity ◽  
Boops Boops

The retention-releasing patterns of the double-grid grating sieve placed on the deck of the purse seiners were revealed for four case species (Sardina pilchardus, Sardinella aurita, Engraulis encrasicolus and Boops boops) using a simulated data predicted from total length (TL) – maximum height (Hmax) and TL – maximum width (Wmax) regressions. To calculate these relationships, samples were collected during commercial purse seine operations between 3 April 2017 and 21 March 2018 in Izmir Bay, Aegean Sea (Turkey). Optimal Bar Spacing (OBS) values corresponding to minimum landing sizes or the length at first maturity were calculated separately for each species. OBS values were found 10.97 mm for sardine (Sardina pilchardus), 11.29 mm for round sardine (Sardinella aurita), 7.78 mm for anchovy (Engraulis encrasicolus) and 17.89 mm for bogue (Boops boops). The bar spacing regulations may constitute a promising management measure to release undersized fish for the purse seine fishery in the Aegean Sea.

​Discrimination of Five Gobid Species (Family: Gobiidae) based on Otolith Morphometry

2021 ◽  
Author(s):  
Vikas Pathak ◽  
Rinchen N. Bhutia ◽  
Shashi Bhushan ◽  
Geetanjali Deshmukhe ◽  
A.K. Jaiswar
Keyword(s):  
Fish Species ◽  
Discriminant Function Analysis ◽  
Function Analysis ◽  
Allometric Growth ◽  
Fish Size ◽  
Sagittal Otolith ◽  
Shape Indices ◽  
Glossogobius Giuris ◽  
Species Specific ◽  
Boleophthalmus Dussumieri

Background: The fishes of family Gobiidae are one of the least studied fishes, especially for otolith structure. The otoliths were possess species specific features. Hence, traits of sagittal otolith of gobid species studied. Methods: Five gobid species Odontamblyopus roseus (Valenciennes, 1837), Trypauchen vagina (Bloch and Schneider, 1801), Glossogobius giuris (Hamilton, 1822), Parachaeturichthys polynema (Bleeker, 1853) and Boleophthalmus dussumieri (Valenciennes, 1837) were investigated by three methods including morphological, shape indices and step wise discriminant function analysis (SDFA). Result: Interrelationship between shape indices investigated, at 95% level of confidence (P less than 0.05), revealed that perimeter of P. polynema and area of T. vagina have isometric growth with their length (b = 3.0071, 2.90, respectively) and otolith area of B. dussumieri have positive allometric growth (b = 4.23077). SDFA, based on otolith morphometry, discriminated species up with 97.18% accuracy. Hence, the results of present investigation can be used for discrimination of the species and as a tool in predicting fish size from the otoliths and in calculating the biomass of these less studied fish species.

Marine litter in stomach content of small pelagic fishes from the Adriatic Sea: sardines (Sardina pilchardus) and anchovies (Engraulis encrasicolus)

2018 ◽  
Vol 26 (3) ◽  
pp. 2771-2781 ◽  
Author(s):  
Monia Renzi ◽  
Antonietta Specchiulli ◽  
Andrea Blašković ◽  
Cristina Manzo ◽  
Giorgio Mancinelli ◽  
...  
Keyword(s):  
Stomach Content ◽  
Adriatic Sea ◽  
Sardina Pilchardus ◽  
Marine Litter ◽  
Engraulis Encrasicolus ◽  
Pelagic Fishes

scholarly journals Feeding and ecomorphology of three clupeoids in the N Aegean Sea

2013 ◽  
Vol 15 (1) ◽  
pp. 9 ◽  
Author(s):  
P. K. KARACHLE ◽  
K. I. STERGIOU
Keyword(s):  
Trophic Level ◽  
Feeding Habits ◽  
Aegean Sea ◽  
Life Cycles ◽  
Mouth Area ◽  
Morphological Features ◽  
Sardina Pilchardus ◽  
Intestine Length ◽  
Sardinella Aurita ◽  
The Individual

The present study examines the feeding habits of anchovy (Engraulis encrasicolus), sardine (Sardina pilchardus) and round sardinella (Sardinella aurita). The results are combined with previously published information on feeding-related morphological features (i.e. mouth area, intestine length and tail area) in order to explore morphological affinities between species and the effect of ecomorphology on their co-existence. These species were mainly zooplanktivorous and no dietary differences were found with sex and season. Anchovy preyed mainly on Crustacea larvae, whereas sardine and round sardinella on Copepoda. In the majority of cases (>90%), the individual fractional trophic level of all species ranged between 3.0 and 3.5, classifying them as omnivores with preference to animals. The feeding-related morphological features differed between anchovy and the two other species, whereas only intestine length differed between sardine and round sardinella. The fact that round sardinella’s diet and morphology show a greater resemblance to those of sardine, further support the hypothesis that is a particulate feeder as sardine. Hence the three species tend to exploit the same food resources differently throughout the year. Thus, they make best use of the environment and its resources, in order to avoid competition and achieve optimum feeding conditions throughout their life cycles

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