Specialization and Diet Overlapped Between Two Alien Species (Carrasius auratus and Tilapia zilli) and Native Species (Barbus luteus) in East Hammar Marsh, Southern Iraq

Al-Lamy, Jinan H.; Resen, Amjed K.; Taher, Majid M.; Muhammed, S. J.

doi:10.4197/mar.23-2.2

Cited by 4 publications

(3 citation statements)

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“…Most animal components in herbivore diets were ascribed to accident feeding. Eggs are found attached on higher plants or entrapped within algal masses which are the main components of plant components of T. Zilli (5,6). This could be a potential explanation to the existence of some animal components within feed items of such primary herbivore which have been recorded here and in previous studies (6,22,35).…”

Section: Resultssupporting

confidence: 62%

Size Related Dietary Variations and Morphological Correlates in Three Freshwater Fishes from Shatt Al-Arab River, Basrah, Iraq

Najim¹,

Al-Modhaffar²,

Jasim³

2013

BJAS

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This study was carried out to investigate the possible relationships of some morphometrics of gill rakers and intestine with size-related dietary variations in three sympatric freshwater fishes. A total of 245 specimens of yellowfin porgy, Acanthopagrus latus, redbelly tilapia, Tilapia zilli and greenback mullet, Liza subviridis (73, 90 and 82 specimens, respectively) were collected from Shatt Al-Arab River from Sep. 2010 to Aug. 2011. To facilitate the follow up of size-related variations, specimens of each fish species were divided into three representative size groups. Results of food analysis using the index of relative importance, IRI, indicated noticeable iter-and intra-specific variations in food habits between the examined species, where A. latus demonstrated evident carnivorous mode of feeding, T. zilli was herbivore and L. subviridis was mostly planktivore. Feeding mode was reflected obviously on gill arch length, gill raker number, length and width. Liza subviridis was characterized by more numerous (41-42), longer (3.38-5.83 mm) and thinner (0.09-0.14 mm) gill rakers, in comparison with other two species. Calculated gill raker gap and filtration area was varied also between species and size groups reflecting distinctive adaptive mechanisms for feeding modes. Filtration area was smaller in the planktivore L. subviridis (108.9-195.5), medium in the herbivorous T. zilli (151.7-267.5) and larger in the carnivore A. latus (174.4-331.2 mm 2). Relative gut length, RGL, showed relatively opposite trend appearing larger in T. zilli (1.86-3.11), medium in L. Subviridis (1.89-2.51) and smaller in A. latus (0.9-1.06). All the studied morphometrics exhibited reasonable correlations with fish size denoting possible ontogenetic food shifts in these species.

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Section: Resultssupporting

confidence: 62%

Size Related Dietary Variations and Morphological Correlates in Three Freshwater Fishes from Shatt Al-Arab River, Basrah, Iraq

Najim¹,

Al-Modhaffar²,

Jasim³

2013

BJAS

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“…The contributions of detritus, diatoms, aquatic insects, fish eggs and zooplankton were relatively low. Al-Lamy et al (2012) stated that this species was a low specialist feeder and consumed mostly macrophytes (67.3%), followed by algae (18.9%) and fish eggs (12.8%) in East Hammar marsh. Wahab (2013) found that C. zillii fed mostly on algae (57.8%), macrophytes (27.1%) and detritus (12.4%) in Tigris river, at Samarra (misspelled as Samaraa), Iraq.…”

Section: Discussionmentioning

confidence: 99%

“…Some studies were conducted on the food and feeding habits of O. aureus and C. zillii in Iraqi waters. Al-Lamy et al (2012) found that C. zillii consumed mostly macrophytes, algae and fish eggs, and reported a low dietary overlaps between C. zilli and both species, Carasobarbus luteus and Carassius auratus in East Hammar marsh. Wahab (2013) stated that C. zillii fed mainly on algae, macrophytes and detritus in Tigris river at Samarra (misspelled as Samaraa).…”

Section: Introductionmentioning

confidence: 98%

Trophic Interactions between Two Cichlid Species in Shatt Al-Arab River, Iraq

Mohamed¹

2021

Biol. Appl. Environ. Res.

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The diet composition and trophic relationships of the blue tilapia, Oreochromis aureus and redbelly tilapia, Coptodon zillii were investigated in the Shatt Al-Arab river from November 2015 to October 2016. Fishes were collected by gill nets, cast net and electro-fishing. The index of relative importance (IRI%) of food items was determined by combining the frequency of occurrence and points methods. There were monthly variations in feeding activity and intensity of both species, which decreased in the colder months. Both species were classified as herbivores. The main food items of O. aureus were macrophytes (44.3%), algae (31.4%), diatoms (9.3%), aquatic insects (6.6%) and detritus (6.3%). The diet of C. zillii is composed mainly of macrophytes (60.8%), algae (23.0%), detritus (8.6%) and diatoms (6.4). The trophic niche breadth values varied between 0.217 for C. zillii and 0.360 for O. aureus. The results demonstrated a high degree of dietary overlap between O. aureus and C. zillii, as both species fed on the same food sources

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Fish Fauna of Shatt al-Arab River, Basrah, Iraq: A More than Quarter a Century of Changes

Jawad

Al-Faisal

Ziyadi

2021

Tigris and Euphrates Rivers: Their Environment From Headwaters to Mouth

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Specialization and Diet Overlapped Between Two Alien Species (Carrasius auratus and Tilapia zilli) and Native Species (Barbus luteus) in East Hammar Marsh, Southern Iraq

Cited by 4 publications

References 0 publications

Size Related Dietary Variations and Morphological Correlates in Three Freshwater Fishes from Shatt Al-Arab River, Basrah, Iraq

Size Related Dietary Variations and Morphological Correlates in Three Freshwater Fishes from Shatt Al-Arab River, Basrah, Iraq

Trophic Interactions between Two Cichlid Species in Shatt Al-Arab River, Iraq

Fish Fauna of Shatt al-Arab River, Basrah, Iraq: A More than Quarter a Century of Changes

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