جستجوی مقالات مرتبط با کلیدواژه « spiral babylon » در نشریات گروه « شیلات »

In this research, spiral babylon (Babylonia spirata L.) specimens were collected by special circular traps from different depths up to 60 m based on the snail distribution from September 2021 to May 2022. The snails were sampled monthly and transferred to the laboratory after counting and washing. The examination of stomach contents showed that this snail species had a scavenger diet and mostly fed on animal corpses including oysters, clams, squids, and shrimps, as well as fish such as Leiognathidae. The length at sexual maturity for females and males were 31.1 and 32.5 mm, respectively. B. spirata had a reproductive potential in all seasons and therefore, this is a gonochronic species with internal fertilization. The females had two spawning peaks with the weakest in autumn and the strongest in winter. Also, the main spawning season for this species was estimated from November to March 2022. At the breeding season, the majority of the stomachs were empty with poor feeding.

In the present study, the population characteristics of Spiral Babylon, Babylonia spirata, were evaluated by sampling at four sites in the northern Oman Sea, Iran, including Pozm, Konark, Beries, Pasabandar from March 2021 to March 2022. A total of 2779 Babylonian snail specimens (1489 males, and 1290 females) were measured and about ten percent of the specimens were described. The mean length and weight of males and females were 36±5, and 32±5 mm and 14±6, 10±4 g, respectively. Growth and mortality indices for females and males including infinite length (L∞ = 68 and 76 mm), growth coefficient (K = 0.54 and 0.3 (yr-1)), natural mortality (M= 0.7 and 0.4 (yr-1)), fishing mortality (F = 2.30 and 1.79 (yr-1)), total mortality (Z = 3 and 2.19 (yr-1)) and exploitation coefficient (E = 0.77 and 0.82 (yr-1)) were estimated. Based on the LBSPR assessment model, estimated to be about 0.3, and a ratio of Pmega<0.1, Lmean/Lopt <1 and Lmean /LF=M<1 show considered undesirable. The present study showed that the Spiral Babylon stock has reached 'overfished' status.