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How to grade fish eggs?

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To grade fish eggs, various methods and techniques can be employed. One approach involves evaluating egg quality based on parameters like fertilization rate, hatching rate, and embryo malformation rate, which can categorize eggs into low, medium, and high-quality groups . Additionally, molecular tools such as probes for insulin-like growth factors (IGFs) and vitellogenin (Vtg) can be utilized to assess egg quality by determining gene expression levels during egg development . Another innovative method involves using image processing and the RGB color model to classify fish eggs as fertile, non-fertile, or rotten, providing a visual grading system for eggs . These diverse approaches, ranging from traditional evaluation methods to molecular and technological advancements, offer comprehensive ways to grade fish eggs effectively.

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Open access•Journal Article•DOI A Simple Paraffin Embedded Protocol For Fish Egg, Embryo, And Larvae Gratiana Eka Wijayanti, Priadi Setyawan, Indah Dwi Kurniawati - Show less +2 more 01 Jun 2017 6 Citations	Not addressed in the paper.
Open access•Dissertation IGF-I, IGF-II and IGF-IR expression as molecular markers for egg quality in mullet and grouper Josette Pesayco Bangcaya 01 Jan 2004	Expression levels of IGF-I, IGF-II, and IGF-IR, along with Vtg quantification using ELISA, can serve as molecular markers for grading fish eggs based on quality indicators.
Journal Article•DOI Eggs Defect Detection using Image Processing Norman Dias, Praise Malewadkar, Sweety Naik, Fedrick Carvalho - Show less +3 more 08 Jul 2017-International Journal of Engineering Research and 3 Citations	Not addressed in the paper.
Open access•Journal Article•DOI DNA Detectives: Outreach Activity Teaching Students to Identify Fish Eggs Using DNA Barcoding. Makenzie Kerr, Mya Breitbart - Show less +1 more 29 Jan 2021-Journal of Microbiology & Biology Education 1 Citations	Fish eggs can be graded by identifying the species using DNA barcoding, a technique that deciphers the genetic code of the egg to determine its origin.
Open access•Journal Article•DOI RNA binding proteins are potential novel biomarkers of egg quality in yellow catfish Fan Ren, Yinglu Meng, Wenjie Guo, Qin Tang, Jie Mei - Show less +4 more 16 Mar 2023-BMC Genomics 1 Citations	Fish eggs can be graded based on fertilization rate, hatching rate, and embryo malformation rate. RNA-binding proteins like igf2bp3, zar1, elavl1, rbm25b are potential biomarkers for egg quality.

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What is the objective of egg grading in the hatchery?5 answersThe primary objective of egg grading in the hatchery is to assess and classify hatching eggs based on various parameters such as size, weight, internal content, fertility, and the presence of defects like dirt, cracks, or deformities. This process aims to ensure the quality of hatching eggs for optimal hatchery operations, maximizing productivity, and efficiency in commercial settings. By utilizing technologies like visual inspection grading devices and egg grading assembly lines, hatcheries can effectively identify and discard defective eggs, guaranteeing the quality of hatching eggs and improving overall efficiency in the hatching process. Egg grading plays a crucial role in maintaining hatchery standards and enhancing the success rates of incubation and breeding practices.

How often is grading required for tropical rock lobsters?5 answersGrading for tropical rock lobsters is required to ensure export value and quality of the product. Currently, fishermen in coastal areas sell their catch without going through the grading process, which affects the freshness of the lobsters. To address this, a study focuses on automating the manual way of measuring lobster size using visual computing technology, which resulted in an 83.33% accuracy in grading. Additionally, a lobster grading machine has been developed with rollers of different diameters and a gap capable of sorting lobsters based on size, reducing production costs and work flow process. The frequency of grading for tropical rock lobsters is not explicitly mentioned in the abstracts provided.

Does high pivkling time affect the quality of salted eggs?2 answersHigh pickling time does affect the quality of salted eggs. The salt content and yolk index increase with longer pickling time. However, pressure cooking at different temperatures and processing times can improve the quality of salted eggs. It decreases the salt content and makes the yolk less hard and gritty, while increasing oil exudation. The physicochemical properties and textural properties of salted eggs also change with longer pickling time. The moisture content of both the raw and cooked egg whites and egg yolks decreases, while the salt content, oil exudation, and hardness of the raw egg yolks increase. Additionally, the albumen pH decreases during pickling, which affects the quality of the eggs. Overall, the quality of salted eggs is influenced by the duration of pickling, with longer pickling times leading to changes in salt content, texture, and other characteristics.

Does high temperature affect the quality of salted eggs?2 answersHigh temperature does affect the quality of salted eggs. The study by Marandi et al. found that the albumen of salted eggs stored at high temperatures showed a decline in egg weight, albumen index, and Haugh Unit score, along with an increase in albumen pH compared to control eggs stored at lower temperatures. Additionally, the study by Luo et al. showed that different storage temperatures significantly affected the sensory quality, weight loss rate, pH, and color of preserved eggs, indicating that high temperature storage can impact the overall quality of preserved eggs. Therefore, it can be concluded that high temperature storage has a negative impact on the quality of salted eggs.

What is the use of non iodized salt to the fish?5 answersNon-iodized salt is used in fish culture as a therapeutant for dips and baths. The goal of a study by McDermott and Petty was to determine if using iodized salt for these purposes increases morbidity/mortality of fish. The study found that there were no significant differences in mortality between fish treated with iodized vs. non-iodized salt, suggesting that the use of iodized salt for baths and dips appears to be safe in fish species tested.

What is the use of non iodized salt to the fish in the aquarium?4 answersNon-iodized salt is commonly used in aquariums to treat fish. It is safe to use non-iodized salt for dips and baths in fish culture, as it does not increase morbidity or mortality of fish. Salt, or sodium chloride (NaCl), is a drug of low regulatory priority in aquaculture and is used to treat external parasites and relieve stress during handling and transport. Non-toxic organic and inorganic compounds, along with acid phosphate salts, can be added to solutions with one-third to two-fifths of ocean salt concentrations to maintain osmotic pressure and support both fresh water and salt water fish in aquariums. Additionally, a fish salting composition containing non-iodized salt, along with other ingredients such as hovenia dulcis, pine needles, and sea tangle, is used to minimize damage to fish muscle tissues during the salting process. Deep-ocean water mixed with divalent and trivalent iron salt can also be used in aquariums to improve the growth of fishes by providing a high concentration of nutritive salts and minerals.

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