BILATERALNA ASIMETRIJA VELIČINE OTOLITA KOD VRSTE Pampus argenteus (OSTEICHTHYES: STROMATIDAE) IZ IRAČKIH MORSKIH VODA

Bilateral asymmetry is presumed to reveal the developmental variability of the fish in polluted aquatic environments. In these habitats, high-level asymmetry develops, and these fish expend more energy to balance their growth than fish that are not under an impact. A total of 121 specimens of Pampus argenteus were collected from Khor Abdulla located in the northwest part of the Arabian Gulf. The asymmetry of two otolith parameters of the marine fish species Pampus argenteus, length and width, was calculated. The results demonstrated that the level of asymmetry was highest for otolith width. The level of asymmetry in both otolith parameters was lowest in fish length ranging between 70-100 mm and the highest in fish ranging between 281-310 mm.Pretpostavlja se da bilateralna asimetrija otkriva varijabilnost u razvoju riba u zagađenom vodenom okruženju. U tim se staništima razvija asimetrija visoke razine i te ribe troše više energije da uravnoteže svoj rast od riba koje nisu pod takvim utjecajima. Ukupno 121 primjerak vrste Pampus argenteus prikupljen je iz Khor Abdulle koji se nalazi u sjeverozapadnom dijelu Arapskog zaljeva. Izračunata je asimetrija dvaju parametara otolita morske vrste Pampus argenteus, duljine i širine. Rezultati su pokazali da je razina asimetrije najveća za širinu otolita. Razina asimetrije u oba parametra otolita najniža je pri duljini riba u rasponu od 70-100 mm, a najviša kod riba u rasponu između 281-310 mm

The common dolphinfish Coryphaena hippurus linnaeus, 1758 (Perciformes, Coryphaenidae) in the marine waters of Iraq

First record of the common dolphinfish Coryphaena hippurus from the Iraqi marine waters is reported in the present study. One adult specimen (762 mm total length) was caught from the waters surrounding the Khor Abdullah within the Iraqi marine territory. It is a new ichthyofaunal record for the area

Incidences of caudal fin malformation in fishes from Jubail City, Saudi Arabia, Arabian Gulf

These case studies endeavor to report incidences of caudal fin deformities in several commercial fishes living in natural populations in the Saudi Arabian coastal waters of the Arabian Gulf. Two groups of anomalies were observed, slight and severe. The carangid species, Parastromateus niger (Bloch) and the soleid species, Euryglossa orientalis (Bloch & Schneider), had slight cases of caudal fin abnormalities, while the species Oreochrromis mossambicus (Peters), Epinephelus stoliczkae (Day), Diagramma pictum (Thunberg), Cephalopholis hemistiktos (Rüppell), Lethrinus nebulosus (Forsskål), and Lutjanus sanguineus (Cuvier) had severe deformities. The abnormalities were assessed by morphological diagnosis. None of the cases was fatal as they occurred in adult individuals. The possible causes for these deformities as well as the suitability of this kind of case study for environmental monitoring are discussed. Further studies should be conducted from the perspective of pollution

The relationship between total length and length & width of the in Otolith of three sparid fish species collected from Iraq waters

The relationships of the fish total length and measurement of the otolith (length and width) was computed for the sparid species, Acanthopagrus bifasciatus, A. arabicus and Sparidentex hasta collected from the marine waters of Iraq at the North West part of the Arabian-Persian Gulf. Fish total length-Otolith length and width equations showed positive allometric growth. The coefficient of determination was R2= 0.939, 0.954 and 0.878 for A. bifasciatus, A. arabicus and S. hasta for Tl-OL relationship respectively. The results display that assessments of body size of the species through biometric examines of otoliths are consistent

Gross anatomy and histology of the olfactory rosette of the shark Heptranchias perlo

reserved7siSharks belonging to the family Hexanchidae have six or seven gill slits, unlike all other elasmobranchs, which have five gill slits. Their olfactory organs have a round shape, which is common for holocepha- lans, but not for elasmobranchs. Thus, the shape of the olfactory organ represents a further, less striking, peculiarity of this family among elasmobranchs. Despite that, the microscopic anatomy and histology of the olfactory organ have not yet been studied in any species of this family. Here, an anatomical and histological description of the olfactory organ of the sharpnose sevengill shark Heptranchias perlo is given. The organ is a rosette, with a central raphe and 31–34 primary lamellae, which bear secondary lamellae with a more or less branched shape. The elastic connective capsule which envelops the olfactory rosette possibly changes its shape along with water influx. In the olfactory epithelium, the supporting cells also have a secretory function, while no specialized mucous cells are visible; regarding this feature the olfac- tory epithelium of H. perlo differs from that of other chondrichthyan species. The immunohistochemical investigation of the sensory epithelium shows the absence of immunoreactivity for G olf in receptor neurons, which confirms previous observations in Chondrichthyes.mixedFerrando, Sara; Gallus, Lorenzo; Amaroli, Andrea; Gambardella, Chiara; Waryani, Baradi; Blasi, Davide Di; Vacchi, MarinoFerrando, Sara; Gallus, Lorenzo; Amaroli, Andrea; Gambardella, Chiara; Waryani, Baradi; Blasi, Davide Di; Vacchi, Marin

TiO2/ZnO Nanocomposite Material for Efficient Degradation of Methylene Blue

In this research work, we have produced a composite material consisting titanium dioxide (TiO2) and zinc oxide (ZnO) nanostructures via precipitation method. Scanning electron microscopy (SEM) study has shown the mixture of nanostructures consisting nanorods and nano flower. Energy dispersive spectroscopy (EDS) study has confirmed the presence of Ti, Zn and O as main elements in the composite. X-ray diffraction (XID) study has revealed that the successful presence of TiO2 and ZnO in the composite. The composite material exhibits small optical energy band gap which led to reduction of the charge recombination rate of electron-hole pairs. The band gap for the composite TiO2/ZnO samples namely 1, 2, 3 and 4 is 3.18, 3.00, 2.97 and 2.83 eV respectively. Small optical bandgap gives less relaxation time for the recombination of electron and hole pairs, thus favorable photodegradation is found. The degradation efficiency for the TiO2/ZnO samples for methylene blue in order of 55.03%, 75.7%, 85.14% and 90.08% is found for the samples 1, 2, 3 and 4 respectively. The proposed study of titanium dioxide addition into ZnO is facile and inexpensive for the development of efficient photocatalysts. This can be capitalized at large scale for the energy and environmental applications.Funding Agencies|King Saud University, Riyadh, Saudi ArabiaKing Saud University [RSP-2020/79]</p

Tin as an Effective Doping Agent into ZnO for the Improved Photodegradation of Rhodamine B

We have fabricated ZnO nano rods by hydrothermal method and successively doped them with tin (Sn) using different concentrations of 25, 50, 75 and 100 mg of tin chloride. XRD of the fabricated structures showed that ZnO possess hexagonal wurtzite phase. Scanning electron microscopy (SEM) was used to explore the morphology and it shows nanorod like morphology for all samples and no considerable change in the structural features were found. The dimension of nanorod is 200 to 300 nm. The doped materials were then investigated for their photo catalytic degradation of environmental pollutant Rhodamine B. The performance of doped ZnO is compared with the pristine ZnO. Scanning electron microscopy (SEM) was used to explore the morphology and it shows nanorod like morphology for all samples and no considerable change in the structural features were found. The dimension of nanorod is 200 to 300 nm. XRD of the fabricated structures showed that ZnO possess hexagonal wurtzite phase. Photo catalytic activity of rhodamine B was investigated under UV light and a maximum degradation efficiency of 85% was obtained. The optical property reveals the reduction in band gap of upto 17.14% for 100 mg Sn doped ZnO. The degradation is followed by the pseudo order kinetics. The produced results are unique in terms of facile synthesis of Sn doped ZnO and excellent photo degradation efficiency, therefore these materials can be used for other environmental applications