Use of eye lens diameter and weight as an age indicator in the carangid fish, Decapterus russelli (Pisces: Carangidae) from Gulf of Oman: preliminary observation

Specimens of Decapterus russelli have been collected from Lema, north of the Gulf of Oman. The ocular lens diameter and weight were tested as an additional age indicator to those already in use. The results showed that this technique could be adopted for determining the age of the species Decapterus russelli when the specimens are in the second year of age in case of eye lens diameter. On the other hand, eye lens weight failed to separate between the four age groups observed. The method is especially useful for age determination when otolith or scale ring are not visible or when false rings give erroneous reading

ODNOSI IZMEĐU DUŽINA RIBE I DUŽINA, ŠIRINA I MASE OTOLITA INDIJSKE SKUŠE RASTRELLIGER KANAGURTA (CUVIER, 1817) IZ OMANSKOG MORA

The relationships between otolith dimensions and fish size (Fish total and fork lengths) for the teleost species, Rastrelliger kanagurta (Cuvier, 1817) collected from the vicinity of Muscat City at Oman Sea were examined and found to be linear. Otolith morphometric observations included length, weight and width were correlated with the total and fork lengths of the fish. Regression models relating each otolith morphometric parameter to the two fish lengths are provided. The significance of each parameter for estimating fish length was examined. The length, width and weight of otolith appeared to have the best discrimination for estimating total and fork length of fish as well as the easiest parameters to measure.U ovom radu su utvrđeni linearni odnosi između veličine otolita i veličine ribe (totalne dužine i dužine vilice) za vrstu koštunjača, Rastrelliger kanagurta (Cuvier, 1817) prikupljenu iz okoline grada Muscat u omanskom moru. Morfometrijska istraživanja otolita, koja su uključivala dužinu, težinu i širinu, su koelirana s ukupnom dužinom i dužinom vilice ribe. Regresijski modeli koji se odnose na svaki morfometrijski parametar otolita na dvije dužine ribe su napravljeni. Značaj svakog parametra za procjenu dužine ribe je ispitan. Dužina, širina i masa otolita pokazali su se kao najbolje sredstvo za procjenu ukupne dužine i dužine vilice ribe, kao i najlakši parametar za mjerenje

DIJAMETAR I MASA OČNE LEĆE KAO INDIKATOR STAROSTI Leiognathus equulus SAKUPLJENIH IZ MORA OMANA

In the leiognathid fish, Leiognathus equulus the diameter of the eye lens can be used for identifying first-year animals, while the eye lens weight proved unreliable for age determination.Kod vrste, Leiognathus equulus korišten je dijametar očne leće za određivanje jednogodišnjih organizama, dok se masa očne leće nije mogla uzeti kao pouzdana za određivanje starosti

Reducing the environmental impact of surgery on a global scale: systematic review and co-prioritization with healthcare workers in 132 countries

Background Healthcare cannot achieve net-zero carbon without addressing operating theatres. The aim of this study was to prioritize feasible interventions to reduce the environmental impact of operating theatres. Methods This study adopted a four-phase Delphi consensus co-prioritization methodology. In phase 1, a systematic review of published interventions and global consultation of perioperative healthcare professionals were used to longlist interventions. In phase 2, iterative thematic analysis consolidated comparable interventions into a shortlist. In phase 3, the shortlist was co-prioritized based on patient and clinician views on acceptability, feasibility, and safety. In phase 4, ranked lists of interventions were presented by their relevance to high-income countries and low–middle-income countries. Results In phase 1, 43 interventions were identified, which had low uptake in practice according to 3042 professionals globally. In phase 2, a shortlist of 15 intervention domains was generated. In phase 3, interventions were deemed acceptable for more than 90 per cent of patients except for reducing general anaesthesia (84 per cent) and re-sterilization of ‘single-use’ consumables (86 per cent). In phase 4, the top three shortlisted interventions for high-income countries were: introducing recycling; reducing use of anaesthetic gases; and appropriate clinical waste processing. In phase 4, the top three shortlisted interventions for low–middle-income countries were: introducing reusable surgical devices; reducing use of consumables; and reducing the use of general anaesthesia. Conclusion This is a step toward environmentally sustainable operating environments with actionable interventions applicable to both high– and low–middle–income countries

Variation in meristic characters of a tilapian fish, Tilapia zilli (Gervais, 1848) from the inland water bodies in Libya

Meristic characters were compared in samples of the tilapian fish, Tilapia zilli (Gervais, 1848), collected from lake Ain Ziana, lake Tawrqa, and Ojala area, Libya. The significant difference in the number of vertebrae and the pectoral fin rays provide an evidence of the existence of three general groups or populations in the three study areas

Scale deformities in Nile tilapia, Oreochromis niloticus, (Actinopterygii: Cichlidae) from Sudan

Scale deformity in Nile tilapia, Oreochromis niloticus, (Actinopterygii: Cichlidae) is reported for the first time from Dongola, north of Sudan. The abnormal scales are fused pairs, with two well-developed foci. Developmental irregularity, probably caused by partially arrested growth, is believed to be the cause of such deformity

Variation in meristic characters of a tilapian fish, Tilapia zilli (Gervais, 1848) from the inland water bodies in Libya

Meristic characters were compared in samples of the tilapian fish, Tilapia zilli (Gervais, 1848), collected from lake Ain Ziana, lake Tawrqa, and Ojala area, Libya. The significant difference in the number of vertebrae and the pectoral fin rays provide an evidence of the existence of three general groups or populations in the three study areas

SKELETAL ABNORMALITIES IN A SPHYRAENA SPHYRAENA (LINNAEUS, 1758) AND A TRACHINUS RADIATUS CUVIER, 1829 COLLECTED FROM THE NORTH-EASTERN AEGEAN SEA, IZMIR, TURKEY [ANOMALIE SCHELETRICHE IN SPHYRAENA SPHYRAENA (LINNAEUS, 1758) E TRACHINUS RADIATUS CUVIER, 1829 PROVENIENTI DALL’EGEO NORD-ORIENTALE, IZMIR, TURCHIA] [SKELETNE ANOMALIJE NA PRIMERKIH VRST SPHYRAENA SPHYRAENA (LINNAEUS, 1758) IN TRACHINUS RADIATUS CUVIER, 1829, UJETIH V SEVEROVZHODEN EGEJSKEM MORJU (IZMIR, TURČIJA)]

This study targeted the skeletal anomalies in a European barracuda, Sphyraena sphyraena, and a starr y weever, Trachinus radiatus obtained from the wild population of the north-eastern Aegean Sea, Izmir, Turkey. A severe case of consecutive repetition of lordosis-kyphosis was obser ved in the S. sphyraena, and a mild case of cranial lordosis, ankylosis, and hyperostosis in the T. radiatus. These records are equally important for fisheries biologists and aquaculturists as this is the first such report for the European barracuda and the starr y weever, which supplements the abnormality incidences already recorded from Turkish waters. The evaluation of the anomalies in the investigated specimens was carried out based on morphological identification and using radiography. Possible reasons for such abnormalities are discussed. Additional investigation would be necessar y to link specific contaminants with the examined types of anomaly. © 2023, The Historical Society of Southern Primorska of Koper, Institute IRRIS for Research, Development and Strategies of Society, Culture and Environment. All rights reserved

Neotropical piranha, Serrasalmus maculatus (Actinopterygii: Characiformes: Serrasalmidae), in the Tigris River, Baghdad, Iraq—a case of deliberate introduction by the aquarium trade

Fifteen specimens (four females and eleven males) of the speckled piranha, Serrasalmus maculatus Kner, 1858, native to South America, were captured in the Tigris River at Al-Taji, 17 km north of the City of Baghdad, Iraq. They represent the first record for this species in Iraq and were captured on 1 February 2018 by anglers, using a hook and line. We suspect that the aquarium trade is accountable for the introduction of this species into Iraq. Moreover, a new maximum size was also recorded based on the specimens examined. The gonads were dissected for a microscopic examination to determine the gender and the state of maturity. The reproductive state suggests that the population of S. maculatus has established itself in the area and is reproducing. An efficient system needs to be put in place to screen the introduction of fishes in order to identify potentially harmful species before their release to the aquarium market