Wild tuna, a species of large ocean fish, have decreased in number because of overfishing. Recently, attempts have been made to farm tuna by feeding the fish in ocean cages until they become large enough for sale. However, tuna farming has faced several problems and criticisms.
First, female tuna do not lay eggs in captivity, so tuna farmers must capture large quantities of young wild tuna to stock their farms, further reducing wild tuna populations. These young tuna are caged and fed until they are large enough to be sold. Since the captured females in tuna farms cannot lay eggs to replace the tuna that are sold, tuna farmers continue to catch young wild tuna to keep their farms going and so worsen the decline in wild tuna populations.
Second, tuna raised on farms are very expensive because they depend on a costly, high-protein food derived from other fish. Tuna feed almost exclusively on small fish, which supply them with the proteins and nutrients they require. A single tuna can grow more than four meters long, weigh close to 700 kilograms, and eat 70 kilograms of food a day! lt is unlikely that tuna farms can remain profitable while supplying so much expensive food for the tuna.
Third tuna confined to ocean cages are likely to become infested with parasites, organisms that feed on and weaken the animal they attach to. Tuna farmers off the coast of southern Australia have had problems with infestations of blood flukes, a type of parasite that lives within the blood vessels and heart of infected fish. Parasite infestations weaken tuna, slow their growth, and can even cause death, usually by making them susceptible to other diseases. Tuna farms in southern Australia have had 10 percent of their tuna die before they could be sold.
The passage presents several problems related to tuna farming, while the professor in the listening opposes these criticisms, pointing to the issues each point made in the passage.
First, the article states that tuna farmers have to obtain a large number of tuna since female tuna fail to lay eggs on farms, which further leads to the population decline of wild tuna. However, the professor argues that by injecting a particular hormone into female tuna's body, they can produce the next generation in captivity as well, so the population decrease of wild tuna simply won't happen.
Second, while the article points out that expensive high-protein food is necessary to feed tuna and thus it is hard for the farm to gain profits, the lecturer rebuts that alternatives are available. He mentions that plants containing high-protein can be processed to make food for tuna affordable by farmers since they are not costly. In this way, farmers can still earn promising money from the tuna business.
Finally, the passage contends that tuna are vulnerable to parasites that eventually cause their death before sales. In contrast, the professor maintains that such infestations can be treated. For example, tuna can avoid being infested with blood flukes by staying offshore, deep in the sea, where such parasites do not present. Hence, the problem of getting infested with parasites can be easily sorted out.
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Grammar and spelling errors:
Line 2, column 60, Rule ID: LARGE_NUMBER_OF[1]
Message: Specify a number, remove phrase, or simply use 'many' or 'numerous'
Suggestion: many; numerous
...states that tuna farmers have to obtain a large number of tuna since female tuna fail to lay eggs...
^^^^^^^^^^^^^^^^^
Transition Words or Phrases used:
but, finally, first, hence, however, second, so, still, thus, well, while, for example, in contrast
Attributes: Values AverageValues Percentages(Values/AverageValues)% => Comments
Performance on Part of Speech:
To be verbs : 9.0 10.4613686534 86% => OK
Auxiliary verbs: 6.0 5.04856512141 119% => OK
Conjunction : 1.0 7.30242825607 14% => More conjunction wanted.
Relative clauses : 10.0 12.0772626932 83% => OK
Pronoun: 15.0 22.412803532 67% => OK
Preposition: 32.0 30.3222958057 106% => OK
Nominalization: 3.0 5.01324503311 60% => More nominalizations (nouns with a suffix like: tion ment ence ance) wanted.
Performance on vocabulary words:
No of characters: 1181.0 1373.03311258 86% => OK
No of words: 228.0 270.72406181 84% => More content wanted.
Chars per words: 5.1798245614 5.08290768461 102% => OK
Fourth root words length: 3.88582923847 4.04702891845 96% => OK
Word Length SD: 2.56048334229 2.5805825403 99% => OK
Unique words: 144.0 145.348785872 99% => OK
Unique words percentage: 0.631578947368 0.540411800872 117% => OK
syllable_count: 367.2 419.366225166 88% => OK
avg_syllables_per_word: 1.6 1.55342163355 103% => OK
A sentence (or a clause, phrase) starts by:
Pronoun: 2.0 3.25607064018 61% => OK
Article: 7.0 8.23620309051 85% => OK
Subordination: 2.0 1.25165562914 160% => OK
Conjunction: 0.0 1.51434878587 0% => OK
Preposition: 2.0 2.5761589404 78% => OK
Performance on sentences:
How many sentences: 10.0 13.0662251656 77% => Need more sentences. Double check the format of sentences, make sure there is a space between two sentences, or have enough periods. And also check the lengths of sentences, maybe they are too long.
Sentence length: 22.0 21.2450331126 104% => OK
Sentence length SD: 49.9548796415 49.2860985944 101% => OK
Chars per sentence: 118.1 110.228320801 107% => OK
Words per sentence: 22.8 21.698381199 105% => OK
Discourse Markers: 9.9 7.06452816374 140% => OK
Paragraphs: 4.0 4.09492273731 98% => OK
Language errors: 1.0 4.19205298013 24% => OK
Sentences with positive sentiment : 3.0 4.33554083885 69% => OK
Sentences with negative sentiment : 6.0 4.45695364238 135% => OK
Sentences with neutral sentiment: 1.0 4.27373068433 23% => More facts, knowledge or examples wanted.
What are sentences with positive/Negative/neutral sentiment?
Coherence and Cohesion:
Essay topic to essay body coherence: 0.261180463307 0.272083759551 96% => OK
Sentence topic coherence: 0.0958700897701 0.0996497079465 96% => OK
Sentence topic coherence SD: 0.0721961044916 0.0662205650399 109% => OK
Paragraph topic coherence: 0.147671983781 0.162205337803 91% => OK
Paragraph topic coherence SD: 0.0763905969574 0.0443174109184 172% => OK
Essay readability:
automated_readability_index: 14.4 13.3589403974 108% => OK
flesch_reading_ease: 49.15 53.8541721854 91% => OK
smog_index: 8.8 5.55761589404 158% => OK
flesch_kincaid_grade: 11.9 11.0289183223 108% => OK
coleman_liau_index: 13.06 12.2367328918 107% => OK
dale_chall_readability_score: 9.51 8.42419426049 113% => OK
difficult_words: 69.0 63.6247240618 108% => OK
linsear_write_formula: 14.0 10.7273730684 131% => OK
gunning_fog: 10.8 10.498013245 103% => OK
text_standard: 14.0 11.2008830022 125% => OK
What are above readability scores?
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Rates: 90.0 out of 100
Scores by essay e-grader: 27.0 Out of 30
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Note: the e-grader does NOT examine the meaning of words and ideas. VIP users will receive further evaluations by advanced module of e-grader and human graders.