scholarly journals Sympatric Clupeoid Fish Larvae in the Northeastern Mediterranean: Coexistence or Avoidance?

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Athanassios C. Tsikliras
Keyword(s):  
Fish Larvae ◽  
Aegean Sea ◽  
Distribution Patterns ◽  
European Anchovy ◽  
Direct Competition ◽  
Commercially Important ◽  
Northern Aegean Sea ◽  
Sardinella Aurita ◽  
Clupeoid Fish ◽  
Competition For Resources

The summer (July 2002 and 2003) larval concentrations of two commercially important clupeoid species (order: Clupeiformes), the European anchovy (Engraulis encrasicolus) and round sardinella (Sardinella aurita), were measured in Kavala Gulf (northern Aegean Sea), in order to examine their distribution patterns. Anchovy was generally most abundant, reaching 13 852 larvae 10 m−2 in 2003 and occurred in more stations compared to round sardinella. Despite the spawning of both species occurring across the entire gulf, the general spatial distribution of their larvae was different, with European anchovy larvae occupying the entire gulf and round sardinella larvae mainly concentrated at offshore stations. The reason proposed for the spatial segregation of their larvae is direct competition for resources. Yet, coexistence of the two species was observed in frontal areas with abundant food resources that prevent competition.

scholarly journals Anisakis spp. burden in Trachurus trachurus

2012 ◽  
Vol 49 (1) ◽  
pp. 16-20 ◽  
Author(s):  
J. Tantanasi ◽  
A. Diakou ◽  
A. Tamvakis ◽  
I. Batjakas
Keyword(s):  
Prediction Model ◽  
Human Health ◽  
Marine Mammals ◽  
Aegean Sea ◽  
Marine Fishes ◽  
Trachurus Trachurus ◽  
Commercially Important ◽  
Northern Aegean Sea ◽  
Paratenic Hosts ◽  
Anisakis Spp

AbstractAnisakis is a parasite of marine mammals that uses a great number of fish species as intermediate or paratenic hosts. It is common in commercially important marine fishes and its presence is of great concern for both human health and economic reasons. Horse mackerels (Trachurus trachurus) originated from the Northern Aegean Sea were examined for the presence of Anisakis spp. larvae. The prevalence of Anisakis spp. was found 98.8 %. The number of parasites was significantly related to the host’s length but was not related to the fish gender. The month of sampling affected the size of the fishes and consequently the number of parasites. The length of larvae was not related to the host’s length. The present study resulted in the design of a prediction model for the number of existing parasites in the fish by measuring only its Fixed Length.

Summer distribution of fish larvae in northern Aegean Sea

2009 ◽  
Vol 89 (6) ◽  
pp. 1137-1146 ◽  
Author(s):  
Athanassios C. Tsikliras ◽  
Emmanuil T. Koutrakis ◽  
Georgios K. Sylaios ◽  
Argyris A. Kallianiotis
Keyword(s):  
Larval Fish ◽  
Fish Larvae ◽  
Aegean Sea ◽  
Taxonomic Resolution ◽  
Low Concentrations ◽  
Northern Aegean Sea ◽  
Summer Distribution ◽  
In The Beginning ◽  
Scale Grid ◽  
Distribution Of Fish

Larval fish and hydrographic data were collected in Kavala Gulf (northern Aegean Sea) across a fine scale grid of 17 stations in two surveys, carried out in the beginning of July 2002 and 2003. Despite the different taxonomic resolution and excluding the unidentified larvae, 22 taxa were caught in 2002 and 27 in 2003. Seventeen taxa were present in both years' collections. A total of 833 larvae were collected during the two samplings. The adults of several larvae caught, although sometimes at very low concentrations, are species with high commercial value or represent a major proportion of the captured production of the northern Aegean Sea. The larvae of European anchovy (Engraulis encrasicolus) were most abundant in both years followed by the brown comber (Serranus hepatus), the gobies (Gobius sp.) and, only for 2003, round sardinella (Sardinella aurita). Maximum anchovy larval densities reached 4145/10 m2 and 13852/10 m2 in the 2002 and 2003 surveys, respectively. The spatial extent of anchovy larvae was also high as they were collected at 12 stations in 2002 and at 15 in 2003. Besides water circulation, the spatial distribution of fish larvae was largely influenced by temperature, salinity and dissolved oxygen.

scholarly journals Fish larvae off the northwestern coast of the Baja California Peninsula, Mexico

Check List ◽  
2010 ◽  
Vol 6 (2) ◽  
pp. 334 ◽  
Author(s):  
S. Patricia A. Jiménez-Rosenberg ◽  
Ricardo J. Saldierna-Martínez ◽  
Gerardo Aceves-Medina ◽  
Alejandro Hinojosa-Medina ◽  
René Funes-Rodríguez ◽  
...  
Keyword(s):  
Reproductive Behavior ◽  
Fish Assemblage ◽  
Community Dynamics ◽  
Baja California ◽  
Larval Fish ◽  
Fish Larvae ◽  
Distribution Patterns ◽  
Baja California Peninsula ◽  
Important Species ◽  
Commercially Important

The structure of the larval fish assemblage of the northwestern Pacific coast of Mexico is analyzed from zooplankton samples taken between 1998 and 2000 off northern and southern Baja California Peninsula. The 198 fish taxa identified reflected the faunal complexity reported previously for the area. Adult distribution patterns and reproductive behavior, added to the environmental seasonality and bathymetric characteristics of the coast, explained differences in the larval fish assemblage. Larvae of meso- and bathypelagics Vinciguerria lucetia, Diogenichthys laternatus, and Triphoturus mexicanus were the most abundant year round. Larvae of commercially important species, such as Engraulis mordax, Sardinops sagax, Merluccius productus, and Trachurus symmetricus, were also abundant during winter and spring, depending on the year and surveyed region. Adult distribution patterns and reproductive behavior, intra- and interannual environmental variability, and bathymetric characteristics of the coast all likely contributed to the differences in the larval fish community through space and time. For example, the abundance of temperate species in northern Baja California was relatively low when warm-water El Niño conditions prevailed in 1998 but increased during the cool-water La Niña period in 1999 and 2000. The results enhance knowledge of the community dynamics of fishes in an ecologically complex and commercially important region.

Genetic studies in four populations of the Northern Aegean Sea, Greece

1989 ◽  
Vol 78 (1) ◽  
pp. 89-106
Author(s):  
R. Schliwa ◽  
Angela Dannewitz ◽  
K. Gilbert ◽  
H. Walter
Keyword(s):  
Aegean Sea ◽  
Genetic Studies ◽  
Northern Aegean Sea

scholarly journals Feeding of the Brycon cephalus, Triportheus elongatus and Semaprochilodus insignis (osteichthyes, characiformes) larvae in Solimões/Amazonas River and floodplain areas.

2002 ◽  
Vol 32 (3) ◽  
pp. 499-499 ◽  
Author(s):  
Rosseval Galdino LEITE ◽  
Carlos A.R.M. ARAUJO-LIMA
Keyword(s):  
Food Item ◽  
Prey Size ◽  
Larval Fish ◽  
Fish Larvae ◽  
Trophic Relations ◽  
Fish Feeding ◽  
Important Species ◽  
Flooded Forests ◽  
Commercially Important

Information on larval fish feeding is essential for understanding their trophic relations, including the management in conditions totally or partially controlled by humans. An experiment was designed to evaluate the larval diets of three commercially important species. Four varzea-lakes and the adjacent river were sampled with bongo and hand nets from January 1993 to November 1995. Larval diets were evaluated by length-classes and capture sites, and were tested by two factor ANOVA. The larvae were feeding in all habitats, except in the flooded forests. The three species had different diets, which varied with their length and lake. The rotifers were the main initial food item of the three species, replaced by fish larvae in Brycon cephalus, cladocerans in Triportheus elongatus and detritus in Semaprochilodus insignis. The increase of the ingestion limit, as the larvae grew, was higher than the increase in the consumed prey size for the three species.

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

Growth and feeding patterns of European anchovy (Engraulis encrasicolus) early life stages in the Aegean Sea (NE Mediterranean)

2010 ◽  
Vol 86 (2) ◽  
pp. 299-312 ◽  
Author(s):  
Ignacio A. Catalán ◽  
Arild Folkvord ◽  
Isabel Palomera ◽  
Gemma Quílez-Badía ◽  
Fotini Kallianoti ◽  
...  
Keyword(s):  
Early Life ◽  
Aegean Sea ◽  
Life Stages ◽  
Early Life Stages ◽  
Feeding Patterns ◽  
European Anchovy ◽  
Engraulis Encrasicolus ◽  
Ne Mediterranean ◽  
European Anchovy Engraulis Encrasicolus

Abundance and population structure of the blue crab Callinectes sapidus (Decapoda, Portunidae) in Thermaikos Gulf (Methoni Bay), northern Aegean Sea

Crustaceana ◽  
2018 ◽  
Vol 91 (6) ◽  
pp. 641-657 ◽  
Author(s):  
Kosmas Kevrekidis ◽  
Chryssanthi Antoniadou
Keyword(s):  
Population Structure ◽  
Blue Crab ◽  
Callinectes Sapidus ◽  
Carapace Width ◽  
Seawater Temperature ◽  
Aegean Sea ◽  
Cold Season ◽  
Mean Size ◽  
Northern Aegean Sea ◽  
Fyke Nets

Abstract The blue crab Callinectes sapidus is an alien decapod established in the Mediterranean Sea. Since 2007, increased abundance has been reported from the northern Aegean Sea sustaining local scale fishery. The present work aims to assess the abundance and population structure of C. sapidus in Thermaikos Gulf using fyke nets. Population abundance, estimated as CPUE, exhibited strong temporal variability with decreased values in the cold season; this pattern was correlated with seawater temperature. Females exhibited also spatial differences with increased abundance close to the Aliakmon estuary. In total, 543 individuals were measured for carapace width. Males prevailed in the population; however, mean size was similar between sexes. Larger individuals were caught from deeper waters and the estuarine areas, whereas mean size decreased temporally. The fyke nets used proved to be size-selective, thus preventing fisheries mortality for juveniles. However, recurrent monitoring is necessary for a sustainable management of blue crab fisheries in the gulf.

Sign in / Sign up

Export Citation Format

Share Document