جستجوی مقالات مرتبط با کلیدواژه « بندر لنگه » در نشریات گروه « شیلات »

This study was conducted to identify different stocks of big marine catfish (Netuma thalassina) as the most dominant marine catfish species in Hormozgan waters using morphological features. 209 big catfish were caught in three different habitats of marine Catfish in Persian Gulf and Oman Sea including Bandar Abbas, Bandar Lengeh and Jask, and the left side and ventral profiler of all samples were photographed. A total of 12 landmarks on the lateral side and 11 landmarks on the ventral homolog were defined on pictures, and digitized by using software tpsDig. Body. Moreover 20 geometric distances between ten landmarks, 9 traditional morphometric features were analyzed using discriminant function analysis (DFA) in different areas. The results of CVA analysis in ventral view of head shape and lateral view according to Mhala Anubis intervals showed that Jask catfish population separated from other groups. Based on ventral view of head shape, the most displacement of landmark parts were related to the tip of the snout, length and width of the head in the Lengeh population which had a shorter head length, wider head and mouth rather than Bandar Abbas and Jask catfish population. The total mean of lateral view showed that the most displacement between landmark points were related to the tip of the operculum, the height of the body and caudal peduncle area. On the other words, Jask catfish population had a thinner body height and longer body length compared to other groups. The results of discriminant function analysis (DFA) classified in an average of 94.7% individuals in their original population. In conclusion, our results showed a high phenotypic variation in big catfish stocks in Iranian coasts of the Persian Gulf and Oman Sea.

The growth of organisms on seven different artificial reef structures was surveyed from 2004-2006 in Hormuzgan offshore waters (Bandar Lengeh area). The organisms consisted of 12 groups the main of which included Barnacle (Megabalanus tintinnabulum), Sponges with five families and Tunicates. The highest density was observed in 2005, amounting to some 409.224g wet weight on each structure. However, a decrease was observed afterwards in the total mass of aquatics living on the structures. Some organisms such as crabs, polychaets, bivalves and fish larvae showed an increasing in size in the first year. Bivalves showed a decreasing trend in density but otherwise an increasing trend in size over time. Artificial shape of the reefs was not effective on the total density of the organisms living on the structures. Total density of live organisms on different parts of the artificial reefs (surface, middle and bottom) was not statistically significant (P>0.05). Numbers of crabs on mixed artificial reefs were higher than the other artificial reefs. This was also the same for barnacles.