scholarly journals The length and weight relationships and feeding ecology of knout goby, Mesogobius batrachocephalus (Pallas, 1814) from Southern Black Sea

2020 ◽  
Vol 37 (4) ◽  
pp. 409-414
Author(s):  
Elizabeth Grace Tunka Bengil ◽  
Mehmet Aydın
Keyword(s):  
Black Sea ◽  
Trophic Level ◽  
Feeding Ecology ◽  
Food Item ◽  
Niche Breadth ◽  
The Black Sea ◽  
Teleost Fishes ◽  
Main Food ◽  
Weight Relationship ◽  
Main Food Item

Among ecologically diverse gobies species, knout goby, Mesogobius batrachocephalus (Pallas, 1814), or previously known as Gobius batrachocephalus, is a Black Sea endemic species. There are studies on this species biological features along the Black Sea but there are only studies on its length and weight relationship along the Turkish coasts of the Black Sea. This study aims to contribute to the lack of knowledge on knout goby length and weight relationship and feeding ecology inhabiting Southern Black Sea. Total of 470 individual of knout goby was collected and it was previously reported that knout goby shows negative (-) allometry though within this study it was found that it only shows negative (-) allometry in spring and positive (+) allometry in other seasons. The diet was composed of crustaceans, teleost fishes and gastropods. According to the relative importance analysis, teleost fishes are the main food item for all and male individuals but for female crustaceans are the main food item. Trophic level results show that for all individuals trophic levels is 4.34, and when sexes are compared females have higher trophic level than males. While both sexes only consume teleost during summer, in other seasons females prefer more crustacean in their diet compared to males. Niche breadth index results indicated that when all individuals diet was compared among seasons in winter the niche breadth was the broader and summer was the narrower, in case of females the broader was fall and for males it was winter. In conclusion, feeding ecology of knout goby changes between seasons and sexes but general prey groups remain the same

scholarly journals Fish larvae as food item of planktonic predator (Chaetognatha)

2018 ◽  
Vol 3 (3) ◽  
pp. 94-96
Author(s):  
I. V. Vdodovich ◽  
P. S. Podrezova ◽  
T. N. Klimova
Keyword(s):  
Black Sea ◽  
Significant Role ◽  
Food Item ◽  
Fish Larvae ◽  
High Abundance ◽  
The Black Sea ◽  
Larvae And Juveniles ◽  
Food Competitor ◽  
First Time ◽  
Active Predator

Photos of predation of sagitta (Chaetognatha) to fish larvae are presented for the first time for the Black Sea. While analyzing ichthyoplankton samples obtained in May and November in 2017 (94ᵗʰ and 98ᵗʰ cruises of RV “Professor Vodyanitsky”) several sagittas were found with their guts containing fish larvae. Fish larvae seem to have been captured by sagittas in the same way as sagittas in cannibalism cases, with both folding in half at the spot of capture. The data obtained allow us to assume sagittas in conditions of high abundance of eggs and fish larvae in the plankton to be not only a food competitor of larvae and juveniles of fish, as a fodder plankton consumer, but an active predator, being able to play a significant role in the elimination of ichthyoplankton.

Ecology of a Speleomantes ambrosii population inhabiting an artificial tunnel

1994 ◽  
Vol 15 (1) ◽  
pp. 35-45 ◽  
Author(s):  
Federico Melodia ◽  
Sebastiano Salvidio ◽  
Maria Tavano ◽  
Mauro Valerio Pastorino ◽  
Aldo Lattes
Keyword(s):  
Spatial Distribution ◽  
Home Range ◽  
Food Item ◽  
Food Abundance ◽  
Main Food ◽  
Juvenile Recruitment ◽  
Microhabitat Heterogeneity ◽  
Nw Italy ◽  
Main Food Item

AbstractA Speleomantes ambrosii population living in an artificial tunnel in NW Italy was studied for two consecutive years. Activity on the walls varied cyclically in relation to seasonal temperatures and food abundance. The main food item was the trogloxenic dipteran Limonia nubeculosa, which accounted for more than 80% of the total ingested prey by volume. Juvenile cave salamanders had a broader trophic nich than adults. Oviposition and juvenile recruitment appeared to be seasonal. The spatial distribution inside the tunnel was related to microhabitat heterogeneity and particularly to the distance from the entrance. Juveniles were observed outside or close to the entrance more often than adults. Movement of adult salamanders were generally low and averaged 7 cm/day; some repeatedly recaptured individuals had a mean home range of 6 m2.

scholarly journals Some population parameters of Mnemiopsis leidyi A. Agassiz, 1865 (Ctenophora: Lobata) in Sinop coasts of the Black Sea

2020 ◽  
Vol 37 (3) ◽  
pp. 285-291
Author(s):  
Zekiye Birinci Özdemir ◽  
Yakup Erdem ◽  
Levent Bat
Keyword(s):  
Black Sea ◽  
Average Length ◽  
The Black Sea ◽  
Mnemiopsis Leidyi ◽  
Population Parameters ◽  
Weight Relationship ◽  
Relationship Equation

Some population parameters of gelatinous macrozooplankton species, Mnemiopsis leidyi, were studied in the present study carried out from January 2008 to December 2008 along the coasts of Sinop in the Black Sea. A total of 980 M. leidyi specimens were measured and weighed. The estimated average length and weight of the species were 3.2±0.060 cm and 7.3±0.250 g, respectively. The observed maximum and minimum lengths were 10.8 cm and 0.2 cm. The maximum and minimum weights measured were 63 g and 0.1 g. The length-weight relationship equation for M. leidyi was determined to be W = 0.7905L1.6406.

scholarly journals Identifying nauplial stages of the Black Sea copepods of Calanidae family in fish larvae guts

2019 ◽  
Vol 4 (3) ◽  
pp. 101-103
Author(s):  
Yu. A. Zagorodnyaya ◽  
I. V. Vdodovich
Keyword(s):  
Black Sea ◽  
Fish Larvae ◽  
Juvenile Fish ◽  
Stage Iii ◽  
The Black Sea ◽  
Main Food ◽  
Food Items ◽  
Common Food ◽  
Original Approach

Nauplial stages of copepods are known to be the main food items for fish larvae. Their identification in fish larvae guts is usually a difficult task and a time-consuming procedure. Original approach to identification of larvae and juvenile fish common food items – nauplial stages of the Black Sea copepods of family Calanidae – is proposed. This work is a continuation of the initiated studies on the developing a method for determining the juvenile copepod stages from fish larvae guts. On the example of nauplial stage III of Calanus euxinus Hulsemann, 1991, specific features that can be used in identifying nauplial stages of three species of the Black Sea copepods from fish larvae guts are shown.

scholarly journals Cannibalism as the main feeding behaviour of tucunares introduced in Southeast Brazil

2004 ◽  
Vol 64 (3b) ◽  
pp. 625-632 ◽  
Author(s):  
L. M. Gomiero ◽  
F. M. S. Braga
Keyword(s):  
Feeding Behaviour ◽  
Food Item ◽  
Main Food ◽  
Southeast Brazil ◽  
Main Food Item

Individuals of its own genus were the main food item of two species of tucunares (Cichla cf. ocellaris and Cichla monoculus) introduced into the Volta Grande Reservoir. The abundance of adult tucunares may cause intra-specific competition, possibly leading to the high cannibalism rates found.

The Diet of Rattus Lutreolus and Five Other Rodents in Southern Victoria.

1978 ◽  
Vol 5 (1) ◽  
pp. 47 ◽  
Author(s):  
CHS Watts ◽  
RW Braithwaite
Keyword(s):  
Mus Musculus ◽  
Plant Material ◽  
Food Item ◽  
Main Food ◽  
Coastal Heath ◽  
Autumn And Winter ◽  
Staple Diet ◽  
Main Food Item

Faeces were studied during 1 to 3 years for rodents live-trapped in 7 areas of Victoria. Diet changed with season for all 6 species studied. In general the staple diet of Rattus lutreolus was basal stem and young rhizome of monocotyledons, probably sedge, and of R. rattus was fungus. Fungus was a main food item for most species and places, especially in winter. Some was basidiomycete but by far the most, especially for R. rattus on coastal heath, was an underground phycomycete tentatively identified as Endogone incrassata. R. fuscipes ate various foods, mainly seeds, insects, fungus and fibrous plant material, whatever was seasonally abundant. Mus musculus ate mostly insects for most of the year, though it is usually considered granivorous and seed was available in summer. Only in June and July were insects less than half the value of food eaten. Pseudomys novaehollandiae ate many foods and almost no insects, but the sample of mice was too small to allow a general conslusion. P. shortridgei ate grass and fungus in autumn and winter but more variety in spring and summer, including flowers, seeds and insects.

scholarly journals Endohelminth fauna of teleost fishes from coasts of Şile region of the Black sea

2021 ◽  
Vol 58 (3) ◽  
pp. 263-270
Author(s):  
B. Aslan Çelık ◽  
M. C. Oğuz
Keyword(s):  
Black Sea ◽  
The Black Sea ◽  
Teleost Fishes ◽  
Infection Rates ◽  
Digenean Species ◽  
First Time ◽  
Common Parasite ◽  
Hysterothylacium Aduncum

Summary A total of 508 fish specimens belonging to 19 species collected in the coast of Şile region of the Black sea were examined to detect the presence of endohelminths. Of this, 357 (70.27%) were found to be infected with parasites. 15 distinct helminths species were recovered including four species of nematodes, seven digenean species, one species of cestodes and three species of acanthocephalans. It was also determined that the species of nematode Hysterothylacium aduncum was the most common parasite and the most diverse endohelminth fauna was found in Gobius niger and Solea vulgaris, with five species. Furthermore, it should be noted that Capillaria gracilis is reported for the first time from the Turkish coasts. The infection rates, hosts, and parasites are listed in this paper.

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