Biometric evaluation of the freshwater snail Pila globosa (Swainson, 1822) from the river Ganga in Bihar, India

IF 0.4 4区农林科学 Q4 FISHERIES

Indian Journal of Fisheries Pub Date : 2023-03-31 DOI:10.21077/ijf.2023.70.1.125224-03

S. K. Ahirwal, Kamal Sarma, Jaspreet singh, Tarkeshwar Kumar, Vivekanakand Bharti, Deva Narayan, Amrendra Kumar

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Abstract

Length-frequency distribution, morphometry, length-weight relationship, relative condition factor and sex ratio of the apple snail Pila globosa (Swainson, 1822) were studied from the river Ganga. A total of 922 specimens were collected during July 2020 to June 2021, ranging from 3.53 to 62.99 g and from 16.49 to 59.78 mm (shell length). Length-frequency distribution revealed that more than 50% of male and female specimens were within 35 to 45 mm in length and only few (1.58%) female specimens were observed in the higher length (>55 mm). Females have significantly longer shells and are heavier than males. Shell length has the strongest correlation with shell width (r=0.974) and the least with penultimate whorl length (r=0.855). Length-weight relationship, indicated that the species has negative allometric growth (b<3). The relative condition factor was 1.07 for males, 1.00 for females and 1.01 for pooled data. Sex ratio (M:F) statistically deviated from the hypothetical ratio of 1:1, indicating a heterogeneous snail population (1:1.9, p<0.05). Keywords: Ganga River, Growth pattern, Shell morphology, Snail Sex ratio

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印度比哈尔邦恒河淡水蜗牛Pila globosa（Swainson，1822）的生物特征评价

研究了恒河苹果蜗牛Pila globosa（Swainson，1822）的长频分布、形态计量、长重关系、相对条件因子和性别比。在2020年7月至2021年6月期间，共收集了922个标本，重量从3.53克到62.99克，长度从16.49毫米到59.78毫米（外壳长度）。长度频率分布显示，超过50%的雄性和雌性标本的长度在35至45mm之间，只有少数（1.58%）的雌性标本在较高的长度（＞55mm）内观察到。雌性的外壳明显比雄性长，而且比雄性重。壳长与壳宽相关性最强（r=0.974），与倒数第二轮长相关性最小（r=0.855）。男性的相对条件因子为1.07，女性为1.00，合并数据为1.01。性别比（M:F）在统计学上偏离了假设的1:1的比例，表明蜗牛种群是异质的（1:1.9，p<0.05）。关键词：恒河，生长模式，外壳形态，蜗牛性别比

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来源期刊

Indian Journal of Fisheries FISHERIES-

CiteScore

0.90

自引率

20.00%

发文量

审稿时长

6-12 weeks

期刊介绍： Indian Journal of Fisheries is published quarterly by the Indian Council of Agricultural Research (ICAR), New Delhi. Original contributions in the field of Fish and fisheries science are considered for publication in the Journal. The material submitted must be unpublished and not under consideration for publication elsewhere. Papers based on research which kills or damages any species, regarded as thratened/ endangered by IUCN crieteria or is as such listed in the Red Data Book appropriate to the geographic area concerned, will not be accepted by the Journal, unless the work has clear conservation objectives.