Dynamics and structure of the herring (Alosa immaculata) catches in the Dniester estuary during the 1994–2016 years / Динаміка та структура уловів оселедця чорноморсько-азовського (Alosa immaculata) в Дністровському лимані, 1994–2016 рр.
Journal Title: Рибогосподарська наука України - Year 2016, Vol 38, Issue 4
Abstract
Purpose. To assess the current state of the Pontic shed in the Dniester estuary. Methodology. Ichthyological samples has been collected in the Dniester estuary according to standard methods. Fish has been caught using gill nets with 30–32 mm mesh size. The methodical guidelines "Metodiki zboru і obrobki іhtіologіchnih і gіdrobіologіchnih materіalіv z metoju viznachennja lіmіtіv promislovogo viluchennja rib z velikih vodoshovishh і limanіv Ukrayiny" (Кyiv, 1998) and "Metodicheskie ukazanija po ocenke chislennosti ryb v presnovodnyh vodoemah" (Moskva, 1990) were used for fish stock assessment. The dynamics of water discharge in the Dniester River was presented based on the observations at gauging stations in Bendery and Tiraspol. Findings. The data of catch dynamics, age and sex composition, length-weight characteristics of the Pontic shed Alosa immaculata Bennett, 1835 in the Dniester estuary 1994–2016 have been presented in the paper. According to official statistics data, the annual catch of the Pontic shed in the Dniester River and Dniester estuary in 1996–2016 ranged from 1.3 to 62.0 tons, with an average of 24.6 tons — 9.8% of the total catch of the Pontic shed in the Danube-Dniester interfluves. A dependence of catch amounts on the water regime of the Dniester River has been observed. An increase in the water flow rate in the river during the spring flood in full-flowing years (annual flow of more than 10 km3), contributes to an increase in the Pontic shed catch in the Dniester estuary. Currently, catches are dominated by age-3 (40.5–59.2% of the total catch) and age-4 (30.7–42.0%) fish. Older age groups are not numerous. Sex ratio was unequal. Females predominated in the control catches, accounting for 65.4% of the total catch. The stock of the Pontic shed entering the Dniester estuary in 2016 was estimated to be 221.0 tones. We recommended to extend the ban of the specialized Pontic shed fishing during the spawning period. Originality. The current state of the spawning stock of the Pontic shed population in the Dniester estuary is presented. Practical value. It is recommended to change the timing of the ban on the specialized Pontic shed fishing in the Dniester estuary, to ensure the passage of a greater number of individuals to the spawning grounds.
Authors and Affiliations
S. M. Snigirov
Keywords
Related Articles
- EP ID EP474904
- DOI 10.15407/fsu2016.04.052
- Views 46
- Downloads 0
Evaluation of the toxicity of ammonia polluted waters for Carassius auratus gibelio (Bloch, 1782) by the «time sampling» method / Оцінювання токсичності забруднених амоніаком вод на Carassius auratus gibelio (Bloch, 1782) методом «Time sampling»
Purpose. To determine the possibility of performing an express-evaluation of the toxicity of ammonia polluted waters based on ethological parameters of Carassius auratus gibelio (Bloch,1782) with the use «time sampling»...
Combination ability of few-scaled type of carp crossbred with Nyvka scaled carp. Growing of young-of-the-year. Message 1 / Комбінаційна здатність коропів малолускатого типу при схрещуванні з нивківським лускатим. Вирощування цьоголіток. Повідомлення 1
Purpose. To obtain and evaluate crossbred young-of-the-year produced by crossing few-scale type of Ukrainian framed carp strain and Nyvka scaled type of Ukrainian scaly carp strain. Methodology. Commonly accepted selec...
Efficiency of the supplementation of age-2 carp (Cyprinus carpio Linnaeus, 1758) diet with saponite and analcime / Ефективність введення сапоніту та анальциму до складу раціону дволіток коропа (Cyprinus carpio Linnaeus, 1758)
Purpose. To perform a comparative analysis of the effect of saponite flour and analcime added to the basic diet of age-2 carp on physiological-biochemical parameters of fish organism. Methodology. Aquaculture, ichtyolog...
Changes in hematological parameters of 1+ carp (Cyprinus carpio Linnaeus, 1758) when introducing the feed supplements "BIO-MOS" and "NUPRO" them into their ration / Гематологічні показники дволіток коропа (Cyprinus carpio Linnaeus, 1758) за введення до їхнього раціону кормових добавок «БІО-МОС» та «НУПРО»
Purpose. To investigate the effect of feed supplements "NUPRO" and "BIO-MOS" on basic hematological indices of the carp (Cyprinus carpio L.). Methodology. Hematological studies on the effect of feed supplements "NUPRO"...
Development of cryoprotective media for low-temperature freezing of sterlet (Acipenser ruthenus) sperm / Розробка кріозахисних середовищ для низькотемпературного заморожування сперми стерляді (Acipenser ruthenus)
Purpose. To develop the optimum composition of a cryoprotective solution for freezing sterlet sperm with the use of new and standard constituents and compare the results of the fertilization of eggs with sperm frozen by...