Snail eater pangasius （Pangasius conchophilus） is a freshwater fish species indigenous to Mekong-Chaophraya Basin, and is an economic fish in Thailand. This paper reviews some Thai research papers for referable bene...Snail eater pangasius （Pangasius conchophilus） is a freshwater fish species indigenous to Mekong-Chaophraya Basin, and is an economic fish in Thailand. This paper reviews some Thai research papers for referable benefit of international countries. The relationships of fecundity with body length and weight of wild population are related （F = 0.54L3339, F = 435.41W^S399）. Length-weight relationships of both sexes are W = 0.0059L3044s. Sex ratio is 1：1 and spawning season starts during March to June, the egg is adhesive demersal. Average mature size of both sexes are from 40-60 cm TL and 1,100-2,900 g. Effect of 3 types of hormone on induced ovulation, including HCG, pituitary gland, and buserelin in combination with domperidone are not signiticantly different （P 〉 0.05）. Hatching occurs in 24-25 hours after fertilization. The hatching percentage is 80%. Nursing and feeding strategies are also reviewed in this paper.展开更多
Understanding and predicting species range-expansions and biological invasions is an important challenge in modem ecology because of rapidly changing environments. Recent studies have revealed that consistent within-s...Understanding and predicting species range-expansions and biological invasions is an important challenge in modem ecology because of rapidly changing environments. Recent studies have revealed that consistent within-species variation in behavior （i.e. animal personality） can be imperative for dispersal success, a key stage in the invasion process. Here we investigate the composition and correlation of two important personality traits associated with invasion success, activity and boldness, and how they are connected to sex and individual size in a newly colonised population of the Chinese mitten crab Eriocheir sinensis in Lake Vanem, Sweden. We found no effect of sex or size on behavioral expressions orE. sinensis but a clear positive correlation between boldness and activity. In addition, this study generates important baseline data for monitoring behavioral develop ment, and thereby changing ecological impact, of an invading population over time. This has implications for predicting ecological effects of invasive species as well as for managing ecological invasions.展开更多
Numerous recent studies present evidence that Australian dingoes Canis lupus dingo can benefit native biodiversity by suppressing mesopredators and large herbivores. Allen and colleagues have challenged the reliabilit...Numerous recent studies present evidence that Australian dingoes Canis lupus dingo can benefit native biodiversity by suppressing mesopredators and large herbivores. Allen and colleagues have challenged the reliability of this evidence. Al- though they make some valid criticisms, I question some of their assertions. While the existing evidence is inconclusive, I argue that to dismiss it completely would be just as dangerous as to embrace it uncritically. I aim to establish a middle ground .展开更多
文摘Snail eater pangasius （Pangasius conchophilus） is a freshwater fish species indigenous to Mekong-Chaophraya Basin, and is an economic fish in Thailand. This paper reviews some Thai research papers for referable benefit of international countries. The relationships of fecundity with body length and weight of wild population are related （F = 0.54L3339, F = 435.41W^S399）. Length-weight relationships of both sexes are W = 0.0059L3044s. Sex ratio is 1：1 and spawning season starts during March to June, the egg is adhesive demersal. Average mature size of both sexes are from 40-60 cm TL and 1,100-2,900 g. Effect of 3 types of hormone on induced ovulation, including HCG, pituitary gland, and buserelin in combination with domperidone are not signiticantly different （P 〉 0.05）. Hatching occurs in 24-25 hours after fertilization. The hatching percentage is 80%. Nursing and feeding strategies are also reviewed in this paper.
文摘Understanding and predicting species range-expansions and biological invasions is an important challenge in modem ecology because of rapidly changing environments. Recent studies have revealed that consistent within-species variation in behavior （i.e. animal personality） can be imperative for dispersal success, a key stage in the invasion process. Here we investigate the composition and correlation of two important personality traits associated with invasion success, activity and boldness, and how they are connected to sex and individual size in a newly colonised population of the Chinese mitten crab Eriocheir sinensis in Lake Vanem, Sweden. We found no effect of sex or size on behavioral expressions orE. sinensis but a clear positive correlation between boldness and activity. In addition, this study generates important baseline data for monitoring behavioral develop ment, and thereby changing ecological impact, of an invading population over time. This has implications for predicting ecological effects of invasive species as well as for managing ecological invasions.
文摘Numerous recent studies present evidence that Australian dingoes Canis lupus dingo can benefit native biodiversity by suppressing mesopredators and large herbivores. Allen and colleagues have challenged the reliability of this evidence. Al- though they make some valid criticisms, I question some of their assertions. While the existing evidence is inconclusive, I argue that to dismiss it completely would be just as dangerous as to embrace it uncritically. I aim to establish a middle ground .
