Summary The length–weight relationships (LWRs) for six little‐known fish species collected in the northern Persian Gulf (south of Iran) are presented, namely, Plicofollis dussumieri, Pseudotriacanthus strigilifer, Cynoglossus bilineatus, Cynoglossus arel, Solea elongata, and Pseudorhombus elevates.

This research describes and presents some biological aspects of five fish species from carangidae family including: Alepes djedaba, Ulua mentalis, Alectis indica, Carangoides coeruleopinnatus, and Carangoides bajad in the Iranian waters of the northern Persian Gulf (Hormozgan Province, Iran). Samples were collected from April to September 2016. The fishing gears were gill nets (80, 100, 120 and 145 mm stretched mesh size), bottom and midwater trawls (30, 40 and 75 mm stretched mesh size in cod-end) of local and commercial fishery. The b values of length-weight relationships ranged from 2.512 (95% CL = 0.054) for U. mentalis to 2.953 (95% CL = 0.155) for C. coeruleopinnatus and the correlation coefficient values (r 2 ) were high for all species.

Abstract. Parsa M, Mahmoudi Khoshdarehgi M, Nekuro A, Pouladi M. 2017. Population dynamics parameters of Silver Pomfret Pampus argenteus in Iranian waters of the northern Persian . This research represents population dynamics parameters of Pampus argenteus including age, growth and mortality parameters in Iranian waters of the northern Persian Gulf and Oman Sea using length-frequency data. Fork length and total weight data collecting of P. argenteus were conducted from April 2014 to March 2015. A total of 1919 specimen were collected ranging from 10 to 32 cm fork length and 35 to 1075 g total weight. The mean length and weight were recorded to be 19.97±0.12 cm and 272.04±7.43 g, respectively. The relationship between fork length and total weight was determined as W = 0.0231FL 3.141 (R 2 =0.9932, n= 643) and indicated that P. argenteus grew allometrically in the study region. The Von Bertalanffy growth function estimates were obtained as: L∞ = 32.55 cm, K = 0.3 year -1 , t 0 =-0.54 years and ϕ′= 2.5. The infinite weight of P. argenteus was estimated as 1301.77 g. The annual instantaneous rate of total mortality (Z) was 1.55 year -1 , the natural mortality (M) was 0.75 year -1 and the fishing mortality (F) was 0.78 year -1. Furthermore, the exploitation rate (E) was calculated as 0.51. Results of the obtained exploitation rate showed that P. argenteus was fully exploited in the study region.

Zeinali F, Kamrani E, Parsa M. 2017. Short Communication: CPUE, CPUA and distribution patterns of four demersal fishes in coastal waters of the northern Persian Gulf, Iran. Nusantara Bioscience 9: 12-17. CPUE, CPUA and distribution patterns of Pampus argenteus, Otolithes ruber, Nemipterus japonicas and Saurida tumbil along the coastal waters of Hormozgan province were investigated. The mean CPUE values for P. argenteus in 0-10 m and 10-20 m depth layers was significantly different (P<0.05). The highest and lowest mean CPUE of S. tumbil were observed in 20-30 m and 0-10 m depth layers, respectively. The highest mean CPUA for P. argenteus was found in 0-10 m depth layer, with a descending trend with increasing the depth. The highest CPUA of O. ruber was observed in 10-20 m depth layer, but the mean CPUA values was not significant among depth layers (P>0.05). The mean CPUA for N. japonicas was relatively high in 30-40 m depth layer and markedly lower in 0-10 m depth layer as the shallowest depth layer. The highest and lowest mean CPUA of S. tumbil were observed in 20-30 m depth layer and 0-10 m depth layer, respectively.

Longtail tuna (Thunnus tonggol) is one of the most economically important tuna species in Iranian waters of Persian Gulf and Oman Sea. Some population dynamics parameters of this species were investigated in coastal waters of the northern Persian Gulf and Oman Sea from January to December 2014. The fork length (FL) of all specimens ranged from 27 to 107 cm, and total weight (TW) was between 200 and 12,000 g. Among the length frequencies examined, specimens with fork length in the range of 62-65 cm were the dominant group. The equation of length-weight relationship was estimated as TW = 0.00003 9 FL , respectively. The exploitation rate (E) was calculated as 0.63 indicating that longtail tuna was fully exploited in the study region.

The relationships between somatic growth and otolith dimensions, otolith size to estimated age and growth parameters of the tigertooth croaker (Otolithes ruber) were investigated in 100 specimens (size range: 19.1-52.0 cm, total length) from the Oman Sea area, September 2014. All 100 otoliths were sectioned and determined by age.The oldest specimen was a 4.5-year-old female with a total length of 40.6 cm; the youngest specimen was also a female estimated at 1 year of age with a total length of 19.1 cm. The von Bertalanffy growth equation was estimated as L t = 54.70 (1 − exp (−0.37 (t + 0.21))). Concluded was that there is a significant relationship between body size, otolith dimensions and estimated age of Otolithes ruber.

coagulation, electro-coagulation and coalescences [5,6]. Absorbent materials are attractive for some applications because of the possibility of collection and complete removal of the oil from the oil spill site [7,8]. The addition of absorbents to oil spill areas facilitates a change from liquid to semi-solid phase and once this change is achieved, the removal of the oil by removal of the absorbent structure then becomes much easier. Furthermore, these materials can, in some cases, be recycled. Some properties of good absorbent materials include

Abstract. Paighambari SY, Pouladi M, Parsa M, Mehdipour N, Haghighatjou N, Jabaleh A, Hedayati A. 2017. Seasonal relative abundance of fish larvae in Helleh River estuary (north of the Persian Gulf, Iran). Biodiversitas 18: 541-547. Study of abundance and composition of fish larvae in order to examine their association with salinity, temperature, dissolved oxygen and transparency was conducted in Helleh River estuary in the north of the Persian Gulf. Samples were collected using Bongo net with 500 μm mesh size and 60 cm mouth diameter size in five selected stations from August 2011 to May 2012. Generally, 1637 fish larvae were isolated from 19 families that most of them were belong to Clupeidae. Seasonal relative abundance (SRA) of fish larvae varied and Clupeidae (39.90%) and Gobiidae (14.35%) in summer; Clupeidae (26.23%) and Sparidae (21.82%) in autumn; Clupeidae (34.43%) and Hemiramphidae (12.02%) in winter; Clupeidae (47.93%) and Sparidae (13.67%) in spring were most abundant than others. Overall, families namely Clupeidae (39.28%), Gobiidae (12.58%) and Sparidae (10.57%) had the highest and Carangidae (0.92%) had the lowest relative abundance during the sampling period. ANOVA test also showed a significant difference between summer and autumn with spring and winter (P<0.05). According to CCA, in stations 4 and 5 in summer; stations 5 in autumn; stations 4 and 5 in winter; and stations 4 and 5 in spring with the highest relative abundance of fish larvae, salinity and temperature and partially transparency and in stations 2, 3 and 4 in autumn, stations 2 and 3 in spring, dissolved oxygen had significant correlation with fish larvae abundance in this estuary.