Iranian Journal of Ichthyology
Volume:9 Issue: 2, Jun 2022

The Gobiidae is one of the largest families of fish in the world. This study deals with the morphometric characteristicsas well as the geometric morphology of the specimens belong to three species from Gobiidae family, i.e. Acentrogobius dayiKoumans, 1941, Bathygobius meggitti(Hora and Mukerji, 1936)and Istigobius ornatus(Rüppell, 1830) from Makran coast, South-East of Iran. A total of 56 specimens were captured from the three stations Tis, Lipar and Darya-Bozorg, from spring to summer 2018. 36 morphological variables were analysed (including univariate and multivariate), using SPSS and PAST software. Also, to test the morphological plasticityof the specimens, the dorsal, lateral (left side) and ventral sides of the specimenswere photographed. 12 Landmarks from the dorsal side, 20 Landmarks from the latral side and 19 Landmarks from the ventral side of the specimens were digitized using tpsDig software. The shape data, based on landmarks coordinates, data were investigated using multivariate analyses. Body shape of each population was visualized based on the average total shape. The results revealed a significant difference in body shape between the studied species. Based on a cluster analysis, A.dayiand I.ornatusspecies were more similarand most difference was observed between B.meggittiand other species. The observed morphological differences could be relevant to the environmental conditions and feeding habits of the studied species. To what degree this continuous data can now be translated into discrete and diagnostic features, useful for taxonomic purposes, remains to be studied.

In the Hadhramout coast, the Gulf of Aden, six substantiated records fish species were recorded for first time. Review of all previous studies and publications show that these species from different families were not previously reported in the Gulf of Aden. The species identified include Parascolopsis eriomma(Nemipteridae), Kyphosus vaigiensis(Kyphosidae), Sargocentron rubrum(Holocentridae), Coryphaena equiselis(Coryphaenidae), Argyrosomus japonicus(Sciaenidae) and Scarus nigar(Scaridae). This paper describes the detailed characteristics of each species.

Age and growth of the Isfahan tooth-carp, Esmaeilius isfahanensis, was studied in the Zayandehrud River, in central Iran, from June 2016 to May 2017. Among the 485 specimens, age groups in both sexes ranged from 0+to 2+. The overall sex ratiowas 1M:1.2F. Maximum total length and weight were 44.9mm and 1.6g for males and 53.6mm and 2.4g for females. The Minimum total length and weight was 26.8mm and 0.40g for males and 32.0 mm and 0.5g for females. The most frequent age groups were 1+in bothsexes. The highest value for the condition factor was observed in July. The von Bertalanffy growth parameters of E. isfahanensis were estimated as k= 0.36, L∞= 34.98mm, t0=1.10 for males and k= 0.53, L∞= 41.02mm and t0= 0.14 years for females. The length-weigh relationship was described as W= 0.00005L2.84 (r2= 0.84) for males and as W= 0.00005L2.84 (r2= 0.83) for females, indicating an isometric growth pattern in both sexes. The Growth performance index φ` was estimated as 6.08 for males and as 6.79 for females, indicating a faster growth rate in females.

This study aimed to explore the reproductive biology and histology of Scomber japonicus from the Mediterranean Sea, Egypt. For this purpose, a total of 511 specimens were collected monthly from Alexandria landing site from the catches of purse-seine nets during 2017-2018. Throughout the reproductive cycle, four maturity stages were determined for males and females (Immature (I); Maturing (II); Ripe and spawning (III), and Spent stage (IV)). Females were predominant the sex ratio (1 Male:1.19 Female). The maturity stages with Gonado-somatic Index (GSI) and ova diameter, illustrating the fractional spawning mode of S. japonicus with an extended spawning (March-June) and a maximum GSI peak in April-May for both sexes.Likewise, Female Hepato-somatic index (HIS) exhibited significant rise during spawning time. The mean absolute fecundity was 28762.98±15431.04oocytes per ovary showing positive correlations with both total weight (0.974) and total length (0.95).The relative fecundity ranged from 420 to 2553 egg/cm for length (TL), and from 76 to 379 egg/g for total weight, showing significant correlation with total length (0.906), and insignificance with total weight (0.398).The length at maturity was 19.7cm and 19.5cm for males and females, respectively. The histological investigations confirmed the spawning time via yolky stages with a partial mode of asynchronous oocytes. These data are updated and provided insights about the reproductive strategy of S. japonicus and its future fishery management in the area.

Live coral cover is a measure of the proportion of reef surface covered by live stony materials instead of sponges, algae, or other organisms. These stony corals are the main contributors to a reef's three-dimensional framework structure that provides critical habitat for many organisms. Therefore, this research aims to determine the relationship between the number of live coral cover and the presence of reef fish in one of the biggest archipelagos located in centre of Indonesia. The research method used for the determination of live coral cover was the point intercept transect, while the reef fish population were measured using the census technique. The results showed, that the average percentage of live coral cover in all stations including Sarappo, Lumulumu, and Langkai Island were 43.17, 52, 45.67%, respectively, and were classified into moderate and good. There were 149 reef fish species in 27 families found in the studied area during this research. The coral cover was negatively correlated with species diversity and the abundance of reef fish in archipelagos of Indonesia.Live coral cover is a measure of the proportion of reef surface covered by live stony materials instead of sponges, algae, or other organisms. These stony corals are the main contributors to a reef's three-dimensional framework structure that provides critical habitat for many organisms. Therefore, this research aims to determine the relationship between the number of live coral cover and the presence of reef fish in one of the biggest archipelagos located in centre of Indonesia. The research method used for the determination of live coral cover was the point intercept transect, while the reef fish population were measured using the census technique. The results showed, that the average percentage of live coral cover in all stations including Sarappo, Lumulumu, and Langkai Island were 43.17, 52, 45.67%, respectively, and were classified into moderate and good. There were 149 reef fish species in 27 families found in the studied area during this research. The coral cover was negatively correlated with species diversity and the abundance of reef fish in archipelagos of Indonesia.

The study was designed to compare the chemical composition of cultured and wild Redbelly tilapia (Coptodon zillii), and Nile tilapia (Oreochromis niloticus) collected from the Shatt Al-Arab River(Southern Iraq) and fish farms (earthen ponds of Marine Science Center, University of Basrah). Twenty fish from each species weighing (77.17-141.56g)were collected. Chemical analysis was conducted for the two groups to determine moisture, protein, fat, ash, and nutritive value. The results showedthat the two groups' protein, fat, and nutritional values differ significantly (P<0.05) between wild and cultured tilapia species. Wild fish have the highest percentage of fat, protein, and nutritional value. Information about the chemical composition of freshwater fishes is useful to nutritionists looking for low-fat, high-protein food sources.