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Factors Influencing Consumer Willingness to Consume Giant River Prawn (<em>Macrobrachium rosenbergii</em>): An Empirical Analysis in Jiangsu Province, China
No full textAgainst the backdrop of global food security strategies and the construction of a Diversified Food Supply System, giant river prawn (Macrobrachium rosenbergii), a key freshwater aquaculture species in China, plays a critical role in ensuring the supply of high-quality protein through industrial development. Using the Theory of Planned Behavior (TPB) as the theoretical framework, this study empirically examines the factors influencing consumers’ intention to consume Macrobrachium rosenbergii based on a questionnaire survey of 352 respondents in Jiangsu Province, China, employing a binary logistic regression model. The results reveal that product attributes (β = 0.846, OR = 2.331), health awareness (β = 0.797, OR = 2.218), behavioral attitude (β = 0.556, OR = 1.743), subjective norms (β = 0.476, OR = 1.610), and perceived behavioral control (β = 0.780, OR = 2.182) significantly and positively affect consumption intention, while households with elderly members or children (β = -1.674, OR = 0.187) and low-income families (β = -2.897, OR = 0.055) exhibit a significant negative impact. Based on these findings, the study proposes designing price-friendly and convenient consumption solutions for low-income groups, strengthening communication about product attributes and health benefits to enhance consumer recognition, and optimizing the industrial chain and distribution channel layout to improve market accessibility and purchasing convenience, aiming to establish a consumer-driven development model for the giant river prawn industry and promote its integration into the national diversified food supply system
Reframing Pre-Modern Language Contact through Trade in Eastern Indonesia: Javanese Linguistic Influence in the Moluccas
Get PDFIn the pre-modern period, Java and Javanese traders were at the center of a complex web of regional and long-distance trade networks extending from India and China to New Guinea. In particular, the Javanese were key players in the spice trade, transporting these from their native Moluccas to the world through the ports of Java. Despite the pivotal role of the Javanese in this trade for hundreds or possibly even a thousand years, the Javanese language has not been considered as a source for loanwords in the Moluccas. Rather, it has typically been assumed by linguists that Malay was the vehicle of transmission of loanwords in the Moluccas, including those with ultimately Javanese origins. This article challenges this prevailing narrative, showing that there is clear evidence for direct borrowing from Javanese. We show that many Javanese loanwords in the Moluccas have dispersed across the region under the influence of the powerful clove-trading sultanates, particularly Ternate and Tidore. Recognition of Javanese as an influential language in trade in the pre- and early-modern period represents an important reframing of eastern Indonesia’s linguistic history
Study on morphological characteristics and hypoxia tolerance of <em>Culter alburnus</em> (♀) × <em>Magalobrama terminalis</em> (♂) and <em>Culter alburnus</em>
No full textC. alburnus (♀) × M. terminalis (♂) (CM) is a new national cultivar formed by interspecific hybridization between C. alburnus and M. terminalis. To explore the morphological characteristics and hypoxia tolerance of CM and C. alburnus, quantitative and countable traits were measured for CM and C. alburnus; then we conducted hypoxia stress research. The results: 1. The main characteristics of CM that differed from C. alburnus in appearance were an increase in body height and thickness, a small blunt pointed head, bulging back of the head, and large scales on the sides of the body. Among the countable traits, the numbers of lateral scales, upper lateral scales, and first-gill rakes of CM were significantly lower than those of C. alburnus, whereas the number of lower lateral scales was significantly greater than that of C. alburnus. 2. At the water temperature of 25 ℃, the DO value of C. alburnus was higher than that of CM. The Superoxide dismutase (SOD) or glutathione (GSH) index of CM increased more when it increased and decreased less when it decreased. The SOD or GSH index of CM was higher than that of the CM under the same hypoxic stress time. Therefore, it was speculated that CM might have stronger hypoxia tolerance than C. alburnus. In summary, CM was generally similar to C. alburnus in terms of morphological characteristics; however, there were differences in body height, body thickness, tail handle, and scales. It has been speculated that CM have a stronger tolerance to hypoxia
Effects of densities and alkalinities on the rearing performance of all-male giant freshwater prawns (<em>Macrobrachium rosenbergii</em> De Man, 1879) postlarvae
Get PDFFarming all-male giant freshwater prawns (Macrobrachium rosenbergii) is becoming increasingly common in aquaculture due to the faster growth and larger maximum weights in males than females. However, the key factors influencing the development of all-male giant freshwater prawns (post-larval AMGFPs) under captive conditions remain insufficiently explored. This study evaluated the growth and survival of post-larval AMGFPs under varying stocking densities (200–600 ind m^−3^) and alkalinities (80--160 mg CaCO~3~ L^−1^) across two completely randomized experiments in three replicates in 1 m^3^ tank systems with a biofloc environment, where a carbon source (rice flour with a C:N ratio of 15:1) was added for biofloc formation. Post-larval AMGFPs (initial mean weight and length of 0.012-0.016 g and 1.13-1.53 cm, respectively) were maintained at a salinity 5‰ and fed commercial feed (40% crude protein) for 60 days. The stocking density in Experiment 2 was 500 m^−3^ (the best stocking density obtained in Experiment 1). The results showed that after 45 rearing days under the experimental conditions, all growth parameters, such as mean weight (MW), daily weight gain (DWG), specific growth rate in weight (SGRw), mean length (ML), daily length gain (DLG), and specific growth rate in length (SGRL), increased as stocking density rose within 200-500 ind m^−3^ but declined at 600 ind m^−3^. The highest survival rate (SR) was observed at a density of 500 ind m^−3^, which was significantly higher than at other densities. Additionally, the highest final biomass (FB) was in 500 and 600 ind m^−3^ and differed from other densities. Besides, from rearing day 30 onward, within the alkalinity range of 80–160 mg CaCO~3~ L^−1^, all growth parameters (weight and length), SR, and FB increased in proportion to both alkalinity level and rearing time, with the highest values at 160 mg CaCO~3~ L^−1^ and significantly differing from those at lower levels at the experimental end. A stocking density of 500 ind m^−3^ and an alkalinity of 160 mg CaCO~3~ L^−1^ were recommended as optimal for rearing post-larval AMGFPs under the tested conditions
Study on the Approval Criteria for Fishing Vessel Main Engine Power Control Based on Main Engine Power Calculation Methods
Get PDFThis study examines the challenges of accurately reviewing and approving the main engine power of multipurpose motorized fishing vessels. It summarizes theoretical estimation methods and examines the impact of various power estimation techniques through example calculations. The effective power method was used to estimate main engine power, and the performance of the fitted equations and auditing methods was evaluated. The results show that there are significant differences in the accuracy of the different auditing methods, with differences as high as 45%. The error of the fitted equation method is below 15%, while the Japanese effective horsepower estimation method has the smallest error of about 10%
Molecular Characterization and Functional Analyses of IGFALS in the Chinese Soft-Shelled Turtle (<em>Pelodiscus sinensis</em>)
Get PDFThe insulin-like growth factor (IGF) system plays a crucial role in the regulation of development, reproduction, and growth. Within this system, the IGF acid-labile subunit (IGFALS) plays a pivotal role in modulating IGF activity by stabilizing circulating IGF complexes. In this study, two IGFALS gene transcripts, named IGFALSX1 and IGFALSX2, were identified for the first time in the Chinese soft-shelled turtle (Pelodiscus sinensis). The cDNA sequences of IGFALSX1 and IGFALSX2 were 2,452 bp and 2,520 bp, respectively, encoding 617 and 616 amino acids (AAs). The IGFALS gene was expressed in all tissues of P. sinensis, with particularly high expression in the liver, gonads, and lungs, and marked sexual dimorphism observed in the liver. Short-term stimulation of juvenile P. sinensis with sex steroids led to significant changes in IGFALS expression in the livers of both male and female individuals, suggesting its potential involvement in steroid-mediated growth modulation. These observations collectively indicate that IGFALS may function as a key molecular mediator in the steroid-responsive growth regulatory pathway of P. sinensis
Non-fishmeal based, and Selected Indigenous Raw Materials as Cost-Effective Feeds for Milkfish Aquaculture
Get PDFThis study aimed to find alternative feeds or supplementary feeds that can perform similarly to the existing commercial feeds thereby reducing farmer expense and cutting down their cost of production and increasing their profitability on Milkfish (Chanos chanos Forsskål, 1775) aquaculture. The formulations for the study included four grow-out treatments mainly: control (commercial feed), taro+control (powdered Colocasia esculenta+commercial fish feed), bloodmeal (formulated fish feed based on bloodmeal), banana stem+control (chopped banana stem+commercial fish feed). The result of the study showed no significant differences between feed treatments from the 6^th^ week onwards, whether with weight (MS=0.130, df=3, F=1.14, p=0.333) or total length of the treatments (MS=0.008, df=3, F=0.40, p=0.75). The FCR ratio showed bloodmeal (1.60) as the lowest, followed by the control (1.65), and taro+commercial (1.71), and then banana stem+commercial (2.18). In terms of weight gain, fish from the bloodmeal treatment gained the highest (236.97 g), followed by control (223.33 g), then taro (217.67 g), and banana stem (196.99 g). As a result, we find that any of the tested treatments can serve as an alternative feed to using purely commercial fish feeds. Cost-benefit analysis showed that a better gross profit margin of 42% and cost-benefit ratio of 1.37 was observed in taro+commercial feed diet. The experiment showed that the taro, Blood meal, and banana stem can be used as an alternative feed component for sustainable milkfish farming
